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-rw-r--r--NEWS4
1 files changed, 4 insertions, 0 deletions
diff --git a/NEWS b/NEWS
index a25c30d7..9489e05c 100644
--- a/NEWS
+++ b/NEWS
@@ -18,6 +18,10 @@ Changes from 4.2.x to 5.0.0
4. PROCINFO["platform"] yields a string indicating the platform for
which gawk was compiled.
+5. Comment handling in the pretty-printer has been reworked almost completely
+ from scratch. As a result, comments in many corner cases that were
+ previously lost are now included in the formatted output.
+
Changes from 4.2.1 to 4.2.2
---------------------------
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-28 12:02:05 +0000
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This is gawk.info, produced by makeinfo version 6.1 from gawk.texi.

Copyright (C) 1989, 1991, 1992, 1993, 1996-2005, 2007, 2009-2016
Free Software Foundation, Inc.


   This is Edition 4.1 of 'GAWK: Effective AWK Programming: A User's
Guide for GNU Awk', for the 4.1.4 (or later) version of the GNU
implementation of AWK.

   Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "GNU General Public License", with the
Front-Cover Texts being "A GNU Manual", and with the Back-Cover Texts as
in (a) below.  A copy of the license is included in the section entitled
"GNU Free Documentation License".

  a. The FSF's Back-Cover Text is: "You have the freedom to copy and
     modify this GNU manual."
INFO-DIR-SECTION Text creation and manipulation
START-INFO-DIR-ENTRY
* Gawk: (gawk).                 A text scanning and processing language.
END-INFO-DIR-ENTRY

INFO-DIR-SECTION Individual utilities
START-INFO-DIR-ENTRY
* awk: (gawk)Invoking gawk.                     Text scanning and processing.
END-INFO-DIR-ENTRY


File: gawk.info,  Node: Top,  Next: Foreword3,  Up: (dir)

General Introduction
********************

This file documents 'awk', a program that you can use to select
particular records in a file and perform operations upon them.

   Copyright (C) 1989, 1991, 1992, 1993, 1996-2005, 2007, 2009-2016
Free Software Foundation, Inc.


   This is Edition 4.1 of 'GAWK: Effective AWK Programming: A User's
Guide for GNU Awk', for the 4.1.4 (or later) version of the GNU
implementation of AWK.

   Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "GNU General Public License", with the
Front-Cover Texts being "A GNU Manual", and with the Back-Cover Texts as
in (a) below.  A copy of the license is included in the section entitled
"GNU Free Documentation License".

  a. The FSF's Back-Cover Text is: "You have the freedom to copy and
     modify this GNU manual."

* Menu:

* Foreword3::                      Some nice words about this
                                   Info file.
* Foreword4::                      More nice words.
* Preface::                        What this Info file is about; brief
                                   history and acknowledgments.
* Getting Started::                A basic introduction to using
                                   'awk'. How to run an 'awk'
                                   program. Command-line syntax.
* Invoking Gawk::                  How to run 'gawk'.
* Regexp::                         All about matching things using regular
                                   expressions.
* Reading Files::                  How to read files and manipulate fields.
* Printing::                       How to print using 'awk'. Describes
                                   the 'print' and 'printf'
                                   statements. Also describes redirection of
                                   output.
* Expressions::                    Expressions are the basic building blocks
                                   of statements.
* Patterns and Actions::           Overviews of patterns and actions.
* Arrays::                         The description and use of arrays. Also
                                   includes array-oriented control statements.
* Functions::                      Built-in and user-defined functions.
* Library Functions::              A Library of 'awk' Functions.
* Sample Programs::                Many 'awk' programs with complete
                                   explanations.
* Advanced Features::              Stuff for advanced users, specific to
                                   'gawk'.
* Internationalization::           Getting 'gawk' to speak your
                                   language.
* Debugger::                       The 'gawk' debugger.
* Arbitrary Precision Arithmetic:: Arbitrary precision arithmetic with
                                   'gawk'.
* Dynamic Extensions::             Adding new built-in functions to
                                   'gawk'.
* Language History::               The evolution of the 'awk'
                                   language.
* Installation::                   Installing 'gawk' under various
                                   operating systems.
* Notes::                          Notes about adding things to 'gawk'
                                   and possible future work.
* Basic Concepts::                 A very quick introduction to programming
                                   concepts.
* Glossary::                       An explanation of some unfamiliar terms.
* Copying::                        Your right to copy and distribute
                                   'gawk'.
* GNU Free Documentation License:: The license for this Info file.
* Index::                          Concept and Variable Index.

* History::                             The history of 'gawk' and
                                        'awk'.
* Names::                               What name to use to find
                                        'awk'.
* This Manual::                         Using this Info file. Includes
                                        sample input files that you can use.
* Conventions::                         Typographical Conventions.
* Manual History::                      Brief history of the GNU project and
                                        this Info file.
* How To Contribute::                   Helping to save the world.
* Acknowledgments::                     Acknowledgments.
* Running gawk::                        How to run 'gawk' programs;
                                        includes command-line syntax.
* One-shot::                            Running a short throwaway
                                        'awk' program.
* Read Terminal::                       Using no input files (input from the
                                        keyboard instead).
* Long::                                Putting permanent 'awk'
                                        programs in files.
* Executable Scripts::                  Making self-contained 'awk'
                                        programs.
* Comments::                            Adding documentation to 'gawk'
                                        programs.
* Quoting::                             More discussion of shell quoting
                                        issues.
* DOS Quoting::                         Quoting in Windows Batch Files.
* Sample Data Files::                   Sample data files for use in the
                                        'awk' programs illustrated in
                                        this Info file.
* Very Simple::                         A very simple example.
* Two Rules::                           A less simple one-line example using
                                        two rules.
* More Complex::                        A more complex example.
* Statements/Lines::                    Subdividing or combining statements
                                        into lines.
* Other Features::                      Other Features of 'awk'.
* When::                                When to use 'gawk' and when to
                                        use other things.
* Intro Summary::                       Summary of the introduction.
* Command Line::                        How to run 'awk'.
* Options::                             Command-line options and their
                                        meanings.
* Other Arguments::                     Input file names and variable
                                        assignments.
* Naming Standard Input::               How to specify standard input with
                                        other files.
* Environment Variables::               The environment variables
                                        'gawk' uses.
* AWKPATH Variable::                    Searching directories for
                                        'awk' programs.
* AWKLIBPATH Variable::                 Searching directories for
                                        'awk' shared libraries.
* Other Environment Variables::         The environment variables.
* Exit Status::                         'gawk''s exit status.
* Include Files::                       Including other files into your
                                        program.
* Loading Shared Libraries::            Loading shared libraries into your
                                        program.
* Obsolete::                            Obsolete Options and/or features.
* Undocumented::                        Undocumented Options and Features.
* Invoking Summary::                    Invocation summary.
* Regexp Usage::                        How to Use Regular Expressions.
* Escape Sequences::                    How to write nonprinting characters.
* Regexp Operators::                    Regular Expression Operators.
* Bracket Expressions::                 What can go between '[...]'.
* Leftmost Longest::                    How much text matches.
* Computed Regexps::                    Using Dynamic Regexps.
* GNU Regexp Operators::                Operators specific to GNU software.
* Case-sensitivity::                    How to do case-insensitive matching.
* Regexp Summary::                      Regular expressions summary.
* Records::                             Controlling how data is split into
                                        records.
* awk split records::                   How standard 'awk' splits
                                        records.
* gawk split records::                  How 'gawk' splits records.
* Fields::                              An introduction to fields.
* Nonconstant Fields::                  Nonconstant Field Numbers.
* Changing Fields::                     Changing the Contents of a Field.
* Field Separators::                    The field separator and how to change
                                        it.
* Default Field Splitting::             How fields are normally separated.
* Regexp Field Splitting::              Using regexps as the field separator.
* Single Character Fields::             Making each character a separate
                                        field.
* Command Line Field Separator::        Setting 'FS' from the command
                                        line.
* Full Line Fields::                    Making the full line be a single
                                        field.
* Field Splitting Summary::             Some final points and a summary table.
* Constant Size::                       Reading constant width data.
* Splitting By Content::                Defining Fields By Content
* Multiple Line::                       Reading multiline records.
* Getline::                             Reading files under explicit program
                                        control using the 'getline'
                                        function.
* Plain Getline::                       Using 'getline' with no
                                        arguments.
* Getline/Variable::                    Using 'getline' into a variable.
* Getline/File::                        Using 'getline' from a file.
* Getline/Variable/File::               Using 'getline' into a variable
                                        from a file.
* Getline/Pipe::                        Using 'getline' from a pipe.
* Getline/Variable/Pipe::               Using 'getline' into a variable
                                        from a pipe.
* Getline/Coprocess::                   Using 'getline' from a coprocess.
* Getline/Variable/Coprocess::          Using 'getline' into a variable
                                        from a coprocess.
* Getline Notes::                       Important things to know about
                                        'getline'.
* Getline Summary::                     Summary of 'getline' Variants.
* Read Timeout::                        Reading input with a timeout.
* Command-line directories::            What happens if you put a directory on
                                        the command line.
* Input Summary::                       Input summary.
* Input Exercises::                     Exercises.
* Print::                               The 'print' statement.
* Print Examples::                      Simple examples of 'print'
                                        statements.
* Output Separators::                   The output separators and how to
                                        change them.
* OFMT::                                Controlling Numeric Output With
                                        'print'.
* Printf::                              The 'printf' statement.
* Basic Printf::                        Syntax of the 'printf' statement.
* Control Letters::                     Format-control letters.
* Format Modifiers::                    Format-specification modifiers.
* Printf Examples::                     Several examples.
* Redirection::                         How to redirect output to multiple
                                        files and pipes.
* Special FD::                          Special files for I/O.
* Special Files::                       File name interpretation in
                                        'gawk'. 'gawk' allows
                                        access to inherited file descriptors.
* Other Inherited Files::               Accessing other open files with
                                        'gawk'.
* Special Network::                     Special files for network
                                        communications.
* Special Caveats::                     Things to watch out for.
* Close Files And Pipes::               Closing Input and Output Files and
                                        Pipes.
* Output Summary::                      Output summary.
* Output Exercises::                    Exercises.
* Values::                              Constants, Variables, and Regular
                                        Expressions.
* Constants::                           String, numeric and regexp constants.
* Scalar Constants::                    Numeric and string constants.
* Nondecimal-numbers::                  What are octal and hex numbers.
* Regexp Constants::                    Regular Expression constants.
* Using Constant Regexps::              When and how to use a regexp constant.
* Variables::                           Variables give names to values for
                                        later use.
* Using Variables::                     Using variables in your programs.
* Assignment Options::                  Setting variables on the command line
                                        and a summary of command-line syntax.
                                        This is an advanced method of input.
* Conversion::                          The conversion of strings to numbers
                                        and vice versa.
* Strings And Numbers::                 How 'awk' Converts Between
                                        Strings And Numbers.
* Locale influences conversions::       How the locale may affect conversions.
* All Operators::                       'gawk''s operators.
* Arithmetic Ops::                      Arithmetic operations ('+',
                                        '-', etc.)
* Concatenation::                       Concatenating strings.
* Assignment Ops::                      Changing the value of a variable or a
                                        field.
* Increment Ops::                       Incrementing the numeric value of a
                                        variable.
* Truth Values and Conditions::         Testing for true and false.
* Truth Values::                        What is "true" and what is
                                        "false".
* Typing and Comparison::               How variables acquire types and how
                                        this affects comparison of numbers and
                                        strings with '<', etc.
* Variable Typing::                     String type versus numeric type.
* Comparison Operators::                The comparison operators.
* POSIX String Comparison::             String comparison with POSIX rules.
* Boolean Ops::                         Combining comparison expressions using
                                        boolean operators '||' ("or"),
                                        '&&' ("and") and '!'
                                        ("not").
* Conditional Exp::                     Conditional expressions select between
                                        two subexpressions under control of a
                                        third subexpression.
* Function Calls::                      A function call is an expression.
* Precedence::                          How various operators nest.
* Locales::                             How the locale affects things.
* Expressions Summary::                 Expressions summary.
* Pattern Overview::                    What goes into a pattern.
* Regexp Patterns::                     Using regexps as patterns.
* Expression Patterns::                 Any expression can be used as a
                                        pattern.
* Ranges::                              Pairs of patterns specify record
                                        ranges.
* BEGIN/END::                           Specifying initialization and cleanup
                                        rules.
* Using BEGIN/END::                     How and why to use BEGIN/END rules.
* I/O And BEGIN/END::                   I/O issues in BEGIN/END rules.
* BEGINFILE/ENDFILE::                   Two special patterns for advanced
                                        control.
* Empty::                               The empty pattern, which matches every
                                        record.
* Using Shell Variables::               How to use shell variables with
                                        'awk'.
* Action Overview::                     What goes into an action.
* Statements::                          Describes the various control
                                        statements in detail.
* If Statement::                        Conditionally execute some
                                        'awk' statements.
* While Statement::                     Loop until some condition is
                                        satisfied.
* Do Statement::                        Do specified action while looping
                                        until some condition is satisfied.
* For Statement::                       Another looping statement, that
                                        provides initialization and increment
                                        clauses.
* Switch Statement::                    Switch/case evaluation for conditional
                                        execution of statements based on a
                                        value.
* Break Statement::                     Immediately exit the innermost
                                        enclosing loop.
* Continue Statement::                  Skip to the end of the innermost
                                        enclosing loop.
* Next Statement::                      Stop processing the current input
                                        record.
* Nextfile Statement::                  Stop processing the current file.
* Exit Statement::                      Stop execution of 'awk'.
* Built-in Variables::                  Summarizes the predefined variables.
* User-modified::                       Built-in variables that you change to
                                        control 'awk'.
* Auto-set::                            Built-in variables where 'awk'
                                        gives you information.
* ARGC and ARGV::                       Ways to use 'ARGC' and
                                        'ARGV'.
* Pattern Action Summary::              Patterns and Actions summary.
* Array Basics::                        The basics of arrays.
* Array Intro::                         Introduction to Arrays
* Reference to Elements::               How to examine one element of an
                                        array.
* Assigning Elements::                  How to change an element of an array.
* Array Example::                       Basic Example of an Array
* Scanning an Array::                   A variation of the 'for'
                                        statement. It loops through the
                                        indices of an array's existing
                                        elements.
* Controlling Scanning::                Controlling the order in which arrays
                                        are scanned.
* Numeric Array Subscripts::            How to use numbers as subscripts in
                                        'awk'.
* Uninitialized Subscripts::            Using Uninitialized variables as
                                        subscripts.
* Delete::                              The 'delete' statement removes an
                                        element from an array.
* Multidimensional::                    Emulating multidimensional arrays in
                                        'awk'.
* Multiscanning::                       Scanning multidimensional arrays.
* Arrays of Arrays::                    True multidimensional arrays.
* Arrays Summary::                      Summary of arrays.
* Built-in::                            Summarizes the built-in functions.
* Calling Built-in::                    How to call built-in functions.
* Numeric Functions::                   Functions that work with numbers,
                                        including 'int()', 'sin()'
                                        and 'rand()'.
* String Functions::                    Functions for string manipulation,
                                        such as 'split()', 'match()'
                                        and 'sprintf()'.
* Gory Details::                        More than you want to know about
                                        '\' and '&' with
                                        'sub()', 'gsub()', and
                                        'gensub()'.
* I/O Functions::                       Functions for files and shell
                                        commands.
* Time Functions::                      Functions for dealing with timestamps.
* Bitwise Functions::                   Functions for bitwise operations.
* Type Functions::                      Functions for type information.
* I18N Functions::                      Functions for string translation.
* User-defined::                        Describes User-defined functions in
                                        detail.
* Definition Syntax::                   How to write definitions and what they
                                        mean.
* Function Example::                    An example function definition and
                                        what it does.
* Function Caveats::                    Things to watch out for.
* Calling A Function::                  Don't use spaces.
* Variable Scope::                      Controlling variable scope.
* Pass By Value/Reference::             Passing parameters.
* Return Statement::                    Specifying the value a function
                                        returns.
* Dynamic Typing::                      How variable types can change at
                                        runtime.
* Indirect Calls::                      Choosing the function to call at
                                        runtime.
* Functions Summary::                   Summary of functions.
* Library Names::                       How to best name private global
                                        variables in library functions.
* General Functions::                   Functions that are of general use.
* Strtonum Function::                   A replacement for the built-in
                                        'strtonum()' function.
* Assert Function::                     A function for assertions in
                                        'awk' programs.
* Round Function::                      A function for rounding if
                                        'sprintf()' does not do it
                                        correctly.
* Cliff Random Function::               The Cliff Random Number Generator.
* Ordinal Functions::                   Functions for using characters as
                                        numbers and vice versa.
* Join Function::                       A function to join an array into a
                                        string.
* Getlocaltime Function::               A function to get formatted times.
* Readfile Function::                   A function to read an entire file at
                                        once.
* Shell Quoting::                       A function to quote strings for the
                                        shell.
* Data File Management::                Functions for managing command-line
                                        data files.
* Filetrans Function::                  A function for handling data file
                                        transitions.
* Rewind Function::                     A function for rereading the current
                                        file.
* File Checking::                       Checking that data files are readable.
* Empty Files::                         Checking for zero-length files.
* Ignoring Assigns::                    Treating assignments as file names.
* Getopt Function::                     A function for processing command-line
                                        arguments.
* Passwd Functions::                    Functions for getting user
                                        information.
* Group Functions::                     Functions for getting group
                                        information.
* Walking Arrays::                      A function to walk arrays of arrays.
* Library Functions Summary::           Summary of library functions.
* Library Exercises::                   Exercises.
* Running Examples::                    How to run these examples.
* Clones::                              Clones of common utilities.
* Cut Program::                         The 'cut' utility.
* Egrep Program::                       The 'egrep' utility.
* Id Program::                          The 'id' utility.
* Split Program::                       The 'split' utility.
* Tee Program::                         The 'tee' utility.
* Uniq Program::                        The 'uniq' utility.
* Wc Program::                          The 'wc' utility.
* Miscellaneous Programs::              Some interesting 'awk'
                                        programs.
* Dupword Program::                     Finding duplicated words in a
                                        document.
* Alarm Program::                       An alarm clock.
* Translate Program::                   A program similar to the 'tr'
                                        utility.
* Labels Program::                      Printing mailing labels.
* Word Sorting::                        A program to produce a word usage
                                        count.
* History Sorting::                     Eliminating duplicate entries from a
                                        history file.
* Extract Program::                     Pulling out programs from Texinfo
                                        source files.
* Simple Sed::                          A Simple Stream Editor.
* Igawk Program::                       A wrapper for 'awk' that
                                        includes files.
* Anagram Program::                     Finding anagrams from a dictionary.
* Signature Program::                   People do amazing things with too much
                                        time on their hands.
* Programs Summary::                    Summary of programs.
* Programs Exercises::                  Exercises.
* Nondecimal Data::                     Allowing nondecimal input data.
* Array Sorting::                       Facilities for controlling array
                                        traversal and sorting arrays.
* Controlling Array Traversal::         How to use PROCINFO["sorted_in"].
* Array Sorting Functions::             How to use 'asort()' and
                                        'asorti()'.
* Two-way I/O::                         Two-way communications with another
                                        process.
* TCP/IP Networking::                   Using 'gawk' for network
                                        programming.
* Profiling::                           Profiling your 'awk' programs.
* Advanced Features Summary::           Summary of advanced features.
* I18N and L10N::                       Internationalization and Localization.
* Explaining gettext::                  How GNU 'gettext' works.
* Programmer i18n::                     Features for the programmer.
* Translator i18n::                     Features for the translator.
* String Extraction::                   Extracting marked strings.
* Printf Ordering::                     Rearranging 'printf' arguments.
* I18N Portability::                    'awk'-level portability
                                        issues.
* I18N Example::                        A simple i18n example.
* Gawk I18N::                           'gawk' is also
                                        internationalized.
* I18N Summary::                        Summary of I18N stuff.
* Debugging::                           Introduction to 'gawk'
                                        debugger.
* Debugging Concepts::                  Debugging in General.
* Debugging Terms::                     Additional Debugging Concepts.
* Awk Debugging::                       Awk Debugging.
* Sample Debugging Session::            Sample debugging session.
* Debugger Invocation::                 How to Start the Debugger.
* Finding The Bug::                     Finding the Bug.
* List of Debugger Commands::           Main debugger commands.
* Breakpoint Control::                  Control of Breakpoints.
* Debugger Execution Control::          Control of Execution.
* Viewing And Changing Data::           Viewing and Changing Data.
* Execution Stack::                     Dealing with the Stack.
* Debugger Info::                       Obtaining Information about the
                                        Program and the Debugger State.
* Miscellaneous Debugger Commands::     Miscellaneous Commands.
* Readline Support::                    Readline support.
* Limitations::                         Limitations and future plans.
* Debugging Summary::                   Debugging summary.
* Computer Arithmetic::                 A quick intro to computer math.
* Math Definitions::                    Defining terms used.
* MPFR features::                       The MPFR features in 'gawk'.
* FP Math Caution::                     Things to know.
* Inexactness of computations::         Floating point math is not exact.
* Inexact representation::              Numbers are not exactly represented.
* Comparing FP Values::                 How to compare floating point values.
* Errors accumulate::                   Errors get bigger as they go.
* Getting Accuracy::                    Getting more accuracy takes some work.
* Try To Round::                        Add digits and round.
* Setting precision::                   How to set the precision.
* Setting the rounding mode::           How to set the rounding mode.
* Arbitrary Precision Integers::        Arbitrary Precision Integer Arithmetic
                                        with 'gawk'.
* POSIX Floating Point Problems::       Standards Versus Existing Practice.
* Floating point summary::              Summary of floating point discussion.
* Extension Intro::                     What is an extension.
* Plugin License::                      A note about licensing.
* Extension Mechanism Outline::         An outline of how it works.
* Extension API Description::           A full description of the API.
* Extension API Functions Introduction:: Introduction to the API functions.
* General Data Types::                  The data types.
* Memory Allocation Functions::         Functions for allocating memory.
* Constructor Functions::               Functions for creating values.
* Registration Functions::              Functions to register things with
                                        'gawk'.
* Extension Functions::                 Registering extension functions.
* Exit Callback Functions::             Registering an exit callback.
* Extension Version String::            Registering a version string.
* Input Parsers::                       Registering an input parser.
* Output Wrappers::                     Registering an output wrapper.
* Two-way processors::                  Registering a two-way processor.
* Printing Messages::                   Functions for printing messages.
* Updating ERRNO::               Functions for updating 'ERRNO'.
* Requesting Values::                   How to get a value.
* Accessing Parameters::                Functions for accessing parameters.
* Symbol Table Access::                 Functions for accessing global
                                        variables.
* Symbol table by name::                Accessing variables by name.
* Symbol table by cookie::              Accessing variables by "cookie".
* Cached values::                       Creating and using cached values.
* Array Manipulation::                  Functions for working with arrays.
* Array Data Types::                    Data types for working with arrays.
* Array Functions::                     Functions for working with arrays.
* Flattening Arrays::                   How to flatten arrays.
* Creating Arrays::                     How to create and populate arrays.
* Extension API Variables::             Variables provided by the API.
* Extension Versioning::                API Version information.
* Extension API Informational Variables:: Variables providing information about
                                        'gawk''s invocation.
* Extension API Boilerplate::           Boilerplate code for using the API.
* Finding Extensions::                  How 'gawk' finds compiled
                                        extensions.
* Extension Example::                   Example C code for an extension.
* Internal File Description::           What the new functions will do.
* Internal File Ops::                   The code for internal file operations.
* Using Internal File Ops::             How to use an external extension.
* Extension Samples::                   The sample extensions that ship with
                                        'gawk'.
* Extension Sample File Functions::     The file functions sample.
* Extension Sample Fnmatch::            An interface to 'fnmatch()'.
* Extension Sample Fork::               An interface to 'fork()' and
                                        other process functions.
* Extension Sample Inplace::            Enabling in-place file editing.
* Extension Sample Ord::                Character to value to character
                                        conversions.
* Extension Sample Readdir::            An interface to 'readdir()'.
* Extension Sample Revout::             Reversing output sample output
                                        wrapper.
* Extension Sample Rev2way::            Reversing data sample two-way
                                        processor.
* Extension Sample Read write array::   Serializing an array to a file.
* Extension Sample Readfile::           Reading an entire file into a string.
* Extension Sample Time::               An interface to 'gettimeofday()'
                                        and 'sleep()'.
* Extension Sample API Tests::          Tests for the API.
* gawkextlib::                          The 'gawkextlib' project.
* Extension summary::                   Extension summary.
* Extension Exercises::                 Exercises.
* V7/SVR3.1::                           The major changes between V7 and
                                        System V Release 3.1.
* SVR4::                                Minor changes between System V
                                        Releases 3.1 and 4.
* POSIX::                               New features from the POSIX standard.
* BTL::                                 New features from Brian Kernighan's
                                        version of 'awk'.
* POSIX/GNU::                           The extensions in 'gawk' not
                                        in POSIX 'awk'.
* Feature History::                     The history of the features in
                                        'gawk'.
* Common Extensions::                   Common Extensions Summary.
* Ranges and Locales::                  How locales used to affect regexp
                                        ranges.
* Contributors::                        The major contributors to
                                        'gawk'.
* History summary::                     History summary.
* Gawk Distribution::                   What is in the 'gawk'
                                        distribution.
* Getting::                             How to get the distribution.
* Extracting::                          How to extract the distribution.
* Distribution contents::               What is in the distribution.
* Unix Installation::                   Installing 'gawk' under
                                        various versions of Unix.
* Quick Installation::                  Compiling 'gawk' under Unix.
* Additional Configuration Options::    Other compile-time options.
* Configuration Philosophy::            How it's all supposed to work.
* Non-Unix Installation::               Installation on Other Operating
                                        Systems.
* PC Installation::                     Installing and Compiling
                                        'gawk' on MS-DOS and OS/2.
* PC Binary Installation::              Installing a prepared distribution.
* PC Compiling::                        Compiling 'gawk' for MS-DOS,
                                        Windows32, and OS/2.
* PC Testing::                          Testing 'gawk' on PC systems.
* PC Using::                            Running 'gawk' on MS-DOS,
                                        Windows32 and OS/2.
* Cygwin::                              Building and running 'gawk'
                                        for Cygwin.
* MSYS::                                Using 'gawk' In The MSYS
                                        Environment.
* VMS Installation::                    Installing 'gawk' on VMS.
* VMS Compilation::                     How to compile 'gawk' under
                                        VMS.
* VMS Dynamic Extensions::              Compiling 'gawk' dynamic
                                        extensions on VMS.
* VMS Installation Details::            How to install 'gawk' under
                                        VMS.
* VMS Running::                         How to run 'gawk' under VMS.
* VMS GNV::                             The VMS GNV Project.
* VMS Old Gawk::                        An old version comes with some VMS
                                        systems.
* Bugs::                                Reporting Problems and Bugs.
* Other Versions::                      Other freely available 'awk'
                                        implementations.
* Installation summary::                Summary of installation.
* Compatibility Mode::                  How to disable certain 'gawk'
                                        extensions.
* Additions::                           Making Additions To 'gawk'.
* Accessing The Source::                Accessing the Git repository.
* Adding Code::                         Adding code to the main body of
                                        'gawk'.
* New Ports::                           Porting 'gawk' to a new
                                        operating system.
* Derived Files::                       Why derived files are kept in the Git
                                        repository.
* Future Extensions::                   New features that may be implemented
                                        one day.
* Implementation Limitations::          Some limitations of the
                                        implementation.
* Extension Design::                    Design notes about the extension API.
* Old Extension Problems::              Problems with the old mechanism.
* Extension New Mechanism Goals::       Goals for the new mechanism.
* Extension Other Design Decisions::    Some other design decisions.
* Extension Future Growth::             Some room for future growth.
* Old Extension Mechanism::             Some compatibility for old extensions.
* Notes summary::                       Summary of implementation notes.
* Basic High Level::                    The high level view.
* Basic Data Typing::                   A very quick intro to data types.

   To my parents, for their love, and for the wonderful example they set
for me.

   To my wife Miriam, for making me complete.  Thank you for building
your life together with me.

   To our children Chana, Rivka, Nachum and Malka, for enrichening our
lives in innumerable ways.


File: gawk.info,  Node: Foreword3,  Next: Foreword4,  Prev: Top,  Up: Top

Foreword to the Third Edition
*****************************

Arnold Robbins and I are good friends.  We were introduced in 1990 by
circumstances--and our favorite programming language, AWK. The
circumstances started a couple of years earlier.  I was working at a new
job and noticed an unplugged Unix computer sitting in the corner.  No
one knew how to use it, and neither did I. However, a couple of days
later, it was running, and I was 'root' and the one-and-only user.  That
day, I began the transition from statistician to Unix programmer.

   On one of many trips to the library or bookstore in search of books
on Unix, I found the gray AWK book, a.k.a. Alfred V. Aho, Brian W.
Kernighan, and Peter J. Weinberger's 'The AWK Programming Language'
(Addison-Wesley, 1988).  'awk''s simple programming paradigm--find a
pattern in the input and then perform an action--often reduced complex
or tedious data manipulations to a few lines of code.  I was excited to
try my hand at programming in AWK.

   Alas, the 'awk' on my computer was a limited version of the language
described in the gray book.  I discovered that my computer had "old
'awk'" and the book described "new 'awk'."  I learned that this was
typical; the old version refused to step aside or relinquish its name.
If a system had a new 'awk', it was invariably called 'nawk', and few
systems had it.  The best way to get a new 'awk' was to 'ftp' the source
code for 'gawk' from 'prep.ai.mit.edu'.  'gawk' was a version of new
'awk' written by David Trueman and Arnold, and available under the GNU
General Public License.

   (Incidentally, it's no longer difficult to find a new 'awk'.  'gawk'
ships with GNU/Linux, and you can download binaries or source code for
almost any system; my wife uses 'gawk' on her VMS box.)

   My Unix system started out unplugged from the wall; it certainly was
not plugged into a network.  So, oblivious to the existence of 'gawk'
and the Unix community in general, and desiring a new 'awk', I wrote my
own, called 'mawk'.  Before I was finished, I knew about 'gawk', but it
was too late to stop, so I eventually posted to a 'comp.sources'
newsgroup.

   A few days after my posting, I got a friendly email from Arnold
introducing himself.  He suggested we share design and algorithms and
attached a draft of the POSIX standard so that I could update 'mawk' to
support language extensions added after publication of 'The AWK
Programming Language'.

   Frankly, if our roles had been reversed, I would not have been so
open and we probably would have never met.  I'm glad we did meet.  He is
an AWK expert's AWK expert and a genuinely nice person.  Arnold
contributes significant amounts of his expertise and time to the Free
Software Foundation.

   This book is the 'gawk' reference manual, but at its core it is a
book about AWK programming that will appeal to a wide audience.  It is a
definitive reference to the AWK language as defined by the 1987 Bell
Laboratories release and codified in the 1992 POSIX Utilities standard.

   On the other hand, the novice AWK programmer can study a wealth of
practical programs that emphasize the power of AWK's basic idioms:
data-driven control flow, pattern matching with regular expressions, and
associative arrays.  Those looking for something new can try out
'gawk''s interface to network protocols via special '/inet' files.

   The programs in this book make clear that an AWK program is typically
much smaller and faster to develop than a counterpart written in C.
Consequently, there is often a payoff to prototyping an algorithm or
design in AWK to get it running quickly and expose problems early.
Often, the interpreted performance is adequate and the AWK prototype
becomes the product.

   The new 'pgawk' (profiling 'gawk'), produces program execution
counts.  I recently experimented with an algorithm that for n lines of
input, exhibited ~ C n^2 performance, while theory predicted ~ C n log n
behavior.  A few minutes poring over the 'awkprof.out' profile
pinpointed the problem to a single line of code.  'pgawk' is a welcome
addition to my programmer's toolbox.

   Arnold has distilled over a decade of experience writing and using
AWK programs, and developing 'gawk', into this book.  If you use AWK or
want to learn how, then read this book.

     Michael Brennan
     Author of 'mawk'
     March 2001


File: gawk.info,  Node: Foreword4,  Next: Preface,  Prev: Foreword3,  Up: Top

Foreword to the Fourth Edition
******************************

Some things don't change.  Thirteen years ago I wrote: "If you use AWK
or want to learn how, then read this book."  True then, and still true
today.

   Learning to use a programming language is about more than mastering
the syntax.  One needs to acquire an understanding of how to use the
features of the language to solve practical programming problems.  A
focus of this book is many examples that show how to use AWK.

   Some things do change.  Our computers are much faster and have more
memory.  Consequently, speed and storage inefficiencies of a high-level
language matter less.  Prototyping in AWK and then rewriting in C for
performance reasons happens less, because more often the prototype is
fast enough.

   Of course, there are computing operations that are best done in C or
C++.  With 'gawk' 4.1 and later, you do not have to choose between
writing your program in AWK or in C/C++.  You can write most of your
program in AWK and the aspects that require C/C++ capabilities can be
written in C/C++, and then the pieces glued together when the 'gawk'
module loads the C/C++ module as a dynamic plug-in.  *note Dynamic
Extensions::, has all the details, and, as expected, many examples to
help you learn the ins and outs.

   I enjoy programming in AWK and had fun (re)reading this book.  I
think you will too.

     Michael Brennan
     Author of 'mawk'
     October 2014


File: gawk.info,  Node: Preface,  Next: Getting Started,  Prev: Foreword4,  Up: Top

Preface
*******

Several kinds of tasks occur repeatedly when working with text files.
You might want to extract certain lines and discard the rest.  Or you
may need to make changes wherever certain patterns appear, but leave the
rest of the file alone.  Such jobs are often easy with 'awk'.  The 'awk'
utility interprets a special-purpose programming language that makes it
easy to handle simple data-reformatting jobs.

   The GNU implementation of 'awk' is called 'gawk'; if you invoke it
with the proper options or environment variables, it is fully compatible
with the POSIX(1) specification of the 'awk' language and with the Unix
version of 'awk' maintained by Brian Kernighan.  This means that all
properly written 'awk' programs should work with 'gawk'.  So most of the
time, we don't distinguish between 'gawk' and other 'awk'
implementations.

   Using 'awk' you can:

   * Manage small, personal databases

   * Generate reports

   * Validate data

   * Produce indexes and perform other document-preparation tasks

   * Experiment with algorithms that you can adapt later to other
     computer languages

   In addition, 'gawk' provides facilities that make it easy to:

   * Extract bits and pieces of data for processing

   * Sort data

   * Perform simple network communications

   * Profile and debug 'awk' programs

   * Extend the language with functions written in C or C++

   This Info file teaches you about the 'awk' language and how you can
use it effectively.  You should already be familiar with basic system
commands, such as 'cat' and 'ls',(2) as well as basic shell facilities,
such as input/output (I/O) redirection and pipes.

   Implementations of the 'awk' language are available for many
different computing environments.  This Info file, while describing the
'awk' language in general, also describes the particular implementation
of 'awk' called 'gawk' (which stands for "GNU 'awk'").  'gawk' runs on a
broad range of Unix systems, ranging from Intel-architecture PC-based
computers up through large-scale systems.  'gawk' has also been ported
to Mac OS X, Microsoft Windows (all versions) and OS/2 PCs, and
OpenVMS.(3)

* Menu:

* History::                     The history of 'gawk' and
                                'awk'.
* Names::                       What name to use to find 'awk'.
* This Manual::                 Using this Info file. Includes sample
                                input files that you can use.
* Conventions::                 Typographical Conventions.
* Manual History::              Brief history of the GNU project and this
                                Info file.
* How To Contribute::           Helping to save the world.
* Acknowledgments::             Acknowledgments.

   ---------- Footnotes ----------

   (1) The 2008 POSIX standard is accessible online at
<http://www.opengroup.org/onlinepubs/9699919799/>.

   (2) These utilities are available on POSIX-compliant systems, as well
as on traditional Unix-based systems.  If you are using some other
operating system, you still need to be familiar with the ideas of I/O
redirection and pipes.

   (3) Some other, obsolete systems to which 'gawk' was once ported are
no longer supported and the code for those systems has been removed.


File: gawk.info,  Node: History,  Next: Names,  Up: Preface

History of 'awk' and 'gawk'
===========================

                   Recipe for a Programming Language

          1 part 'egrep'   1 part 'snobol'
          2 parts 'ed'     3 parts C

   Blend all parts well using 'lex' and 'yacc'.  Document minimally and
release.

   After eight years, add another part 'egrep' and two more parts C.
Document very well and release.

   The name 'awk' comes from the initials of its designers: Alfred V.
Aho, Peter J. Weinberger, and Brian W. Kernighan.  The original version
of 'awk' was written in 1977 at AT&T Bell Laboratories.  In 1985, a new
version made the programming language more powerful, introducing
user-defined functions, multiple input streams, and computed regular
expressions.  This new version became widely available with Unix System
V Release 3.1 (1987).  The version in System V Release 4 (1989) added
some new features and cleaned up the behavior in some of the "dark
corners" of the language.  The specification for 'awk' in the POSIX
Command Language and Utilities standard further clarified the language.
Both the 'gawk' designers and the original 'awk' designers at Bell
Laboratories provided feedback for the POSIX specification.

   Paul Rubin wrote 'gawk' in 1986.  Jay Fenlason completed it, with
advice from Richard Stallman.  John Woods contributed parts of the code
as well.  In 1988 and 1989, David Trueman, with help from me, thoroughly
reworked 'gawk' for compatibility with the newer 'awk'.  Circa 1994, I
became the primary maintainer.  Current development focuses on bug
fixes, performance improvements, standards compliance, and,
occasionally, new features.

   In May 1997, Ju"rgen Kahrs felt the need for network access from
'awk', and with a little help from me, set about adding features to do
this for 'gawk'.  At that time, he also wrote the bulk of 'TCP/IP
Internetworking with 'gawk'' (a separate document, available as part of
the 'gawk' distribution).  His code finally became part of the main
'gawk' distribution with 'gawk' version 3.1.

   John Haque rewrote the 'gawk' internals, in the process providing an
'awk'-level debugger.  This version became available as 'gawk' version
4.0 in 2011.

   *Note Contributors:: for a full list of those who have made important
contributions to 'gawk'.


File: gawk.info,  Node: Names,  Next: This Manual,  Prev: History,  Up: Preface

A Rose by Any Other Name
========================

The 'awk' language has evolved over the years.  Full details are
provided in *note Language History::.  The language described in this
Info file is often referred to as "new 'awk'."  By analogy, the original
version of 'awk' is referred to as "old 'awk'."

   On most current systems, when you run the 'awk' utility you get some
version of new 'awk'.(1)  If your system's standard 'awk' is the old
one, you will see something like this if you try the test program:

     $ awk 1 /dev/null
     error-> awk: syntax error near line 1
     error-> awk: bailing out near line 1

In this case, you should find a version of new 'awk', or just install
'gawk'!

   Throughout this Info file, whenever we refer to a language feature
that should be available in any complete implementation of POSIX 'awk',
we simply use the term 'awk'.  When referring to a feature that is
specific to the GNU implementation, we use the term 'gawk'.

   ---------- Footnotes ----------

   (1) Only Solaris systems still use an old 'awk' for the default 'awk'
utility.  A more modern 'awk' lives in '/usr/xpg6/bin' on these systems.


File: gawk.info,  Node: This Manual,  Next: Conventions,  Prev: Names,  Up: Preface

Using This Book
===============

The term 'awk' refers to a particular program as well as to the language
you use to tell this program what to do.  When we need to be careful, we
call the language "the 'awk' language," and the program "the 'awk'
utility."  This Info file explains both how to write programs in the
'awk' language and how to run the 'awk' utility.  The term "'awk'
program" refers to a program written by you in the 'awk' programming
language.

   Primarily, this Info file explains the features of 'awk' as defined
in the POSIX standard.  It does so in the context of the 'gawk'
implementation.  While doing so, it also attempts to describe important
differences between 'gawk' and other 'awk' implementations.(1)  Finally,
it notes any 'gawk' features that are not in the POSIX standard for
'awk'.

   There are sidebars scattered throughout the Info file.  They add a
more complete explanation of points that are relevant, but not likely to
be of interest on first reading.  All appear in the index, under the
heading "sidebar."

   Most of the time, the examples use complete 'awk' programs.  Some of
the more advanced minor nodes show only the part of the 'awk' program
that illustrates the concept being described.

   Although this Info file is aimed principally at people who have not
been exposed to 'awk', there is a lot of information here that even the
'awk' expert should find useful.  In particular, the description of
POSIX 'awk' and the example programs in *note Library Functions::, and
in *note Sample Programs::, should be of interest.

   This Info file is split into several parts, as follows:

   * Part I describes the 'awk' language and the 'gawk' program in
     detail.  It starts with the basics, and continues through all of
     the features of 'awk'.  It contains the following chapters:

        - *note Getting Started::, provides the essentials you need to
          know to begin using 'awk'.

        - *note Invoking Gawk::, describes how to run 'gawk', the
          meaning of its command-line options, and how it finds 'awk'
          program source files.

        - *note Regexp::, introduces regular expressions in general, and
          in particular the flavors supported by POSIX 'awk' and 'gawk'.

        - *note Reading Files::, describes how 'awk' reads your data.
          It introduces the concepts of records and fields, as well as
          the 'getline' command.  I/O redirection is first described
          here.  Network I/O is also briefly introduced here.

        - *note Printing::, describes how 'awk' programs can produce
          output with 'print' and 'printf'.

        - *note Expressions::, describes expressions, which are the
          basic building blocks for getting most things done in a
          program.

        - *note Patterns and Actions::, describes how to write patterns
          for matching records, actions for doing something when a
          record is matched, and the predefined variables 'awk' and
          'gawk' use.

        - *note Arrays::, covers 'awk''s one-and-only data structure:
          the associative array.  Deleting array elements and whole
          arrays is described, as well as sorting arrays in 'gawk'.  The
          major node also describes how 'gawk' provides arrays of
          arrays.

        - *note Functions::, describes the built-in functions 'awk' and
          'gawk' provide, as well as how to define your own functions.
          It also discusses how 'gawk' lets you call functions
          indirectly.

   * Part II shows how to use 'awk' and 'gawk' for problem solving.
     There is lots of code here for you to read and learn from.  This
     part contains the following chapters:

        - *note Library Functions::, provides a number of functions
          meant to be used from main 'awk' programs.

        - *note Sample Programs::, provides many sample 'awk' programs.

     Reading these two chapters allows you to see 'awk' solving real
     problems.

   * Part III focuses on features specific to 'gawk'.  It contains the
     following chapters:

        - *note Advanced Features::, describes a number of advanced
          features.  Of particular note are the abilities to control the
          order of array traversal, have two-way communications with
          another process, perform TCP/IP networking, and profile your
          'awk' programs.

        - *note Internationalization::, describes special features for
          translating program messages into different languages at
          runtime.

        - *note Debugger::, describes the 'gawk' debugger.

        - *note Arbitrary Precision Arithmetic::, describes advanced
          arithmetic facilities.

        - *note Dynamic Extensions::, describes how to add new variables
          and functions to 'gawk' by writing extensions in C or C++.

   * Part IV provides the appendices, the Glossary, and two licenses
     that cover the 'gawk' source code and this Info file, respectively.
     It contains the following appendices:

        - *note Language History::, describes how the 'awk' language has
          evolved since its first release to the present.  It also
          describes how 'gawk' has acquired features over time.

        - *note Installation::, describes how to get 'gawk', how to
          compile it on POSIX-compatible systems, and how to compile and
          use it on different non-POSIX systems.  It also describes how
          to report bugs in 'gawk' and where to get other freely
          available 'awk' implementations.

        - *note Notes::, describes how to disable 'gawk''s extensions,
          as well as how to contribute new code to 'gawk', and some
          possible future directions for 'gawk' development.

        - *note Basic Concepts::, provides some very cursory background
          material for those who are completely unfamiliar with computer
          programming.

          The *note Glossary::, defines most, if not all, of the
          significant terms used throughout the Info file.  If you find
          terms that you aren't familiar with, try looking them up here.

        - *note Copying::, and *note GNU Free Documentation License::,
          present the licenses that cover the 'gawk' source code and
          this Info file, respectively.

   ---------- Footnotes ----------

   (1) All such differences appear in the index under the entry
"differences in 'awk' and 'gawk'."


File: gawk.info,  Node: Conventions,  Next: Manual History,  Prev: This Manual,  Up: Preface

Typographical Conventions
=========================

This Info file is written in Texinfo
(http://www.gnu.org/software/texinfo/), the GNU documentation formatting
language.  A single Texinfo source file is used to produce both the
printed and online versions of the documentation.  This minor node
briefly documents the typographical conventions used in Texinfo.

   Examples you would type at the command line are preceded by the
common shell primary and secondary prompts, '$' and '>'.  Input that you
type is shown 'like this'.  Output from the command is preceded by the
glyph "-|".  This typically represents the command's standard output.
Error messages and other output on the command's standard error are
preceded by the glyph "error->".  For example:

     $ echo hi on stdout
     -| hi on stdout
     $ echo hello on stderr 1>&2
     error-> hello on stderr

   Characters that you type at the keyboard look 'like this'.  In
particular, there are special characters called "control characters."
These are characters that you type by holding down both the 'CONTROL'
key and another key, at the same time.  For example, a 'Ctrl-d' is typed
by first pressing and holding the 'CONTROL' key, next pressing the 'd'
key, and finally releasing both keys.

   For the sake of brevity, throughout this Info file, we refer to Brian
Kernighan's version of 'awk' as "BWK 'awk'."  (*Note Other Versions::
for information on his and other versions.)

Dark Corners
------------

     Dark corners are basically fractal--no matter how much you
     illuminate, there's always a smaller but darker one.
                         -- _Brian Kernighan_

   Until the POSIX standard (and 'GAWK: Effective AWK Programming'),
many features of 'awk' were either poorly documented or not documented
at all.  Descriptions of such features (often called "dark corners") are
noted in this Info file with "(d.c.)."  They also appear in the index
under the heading "dark corner."

   But, as noted by the opening quote, any coverage of dark corners is
by definition incomplete.

   Extensions to the standard 'awk' language that are supported by more
than one 'awk' implementation are marked "(c.e.)," and listed in the
index under "common extensions" and "extensions, common."


File: gawk.info,  Node: Manual History,  Next: How To Contribute,  Prev: Conventions,  Up: Preface

The GNU Project and This Book
=============================

The Free Software Foundation (FSF) is a nonprofit organization dedicated
to the production and distribution of freely distributable software.  It
was founded by Richard M. Stallman, the author of the original Emacs
editor.  GNU Emacs is the most widely used version of Emacs today.

   The GNU(1) Project is an ongoing effort on the part of the Free
Software Foundation to create a complete, freely distributable,
POSIX-compliant computing environment.  The FSF uses the GNU General
Public License (GPL) to ensure that its software's source code is always
available to the end user.  A copy of the GPL is included for your
reference (*note Copying::).  The GPL applies to the C language source
code for 'gawk'.  To find out more about the FSF and the GNU Project
online, see the GNU Project's home page (http://www.gnu.org).  This Info
file may also be read from GNU's website
(http://www.gnu.org/software/gawk/manual/).

   A shell, an editor (Emacs), highly portable optimizing C, C++, and
Objective-C compilers, a symbolic debugger and dozens of large and small
utilities (such as 'gawk'), have all been completed and are freely
available.  The GNU operating system kernel (the HURD), has been
released but remains in an early stage of development.

   Until the GNU operating system is more fully developed, you should
consider using GNU/Linux, a freely distributable, Unix-like operating
system for Intel, Power Architecture, Sun SPARC, IBM S/390, and other
systems.(2)  Many GNU/Linux distributions are available for download
from the Internet.

   The Info file itself has gone through multiple previous editions.
Paul Rubin wrote the very first draft of 'The GAWK Manual'; it was
around 40 pages long.  Diane Close and Richard Stallman improved it,
yielding a version that was around 90 pages and barely described the
original, "old" version of 'awk'.

   I started working with that version in the fall of 1988.  As work on
it progressed, the FSF published several preliminary versions (numbered
0.X).  In 1996, edition 1.0 was released with 'gawk' 3.0.0.  The FSF
published the first two editions under the title 'The GNU Awk User's
Guide'.

   This edition maintains the basic structure of the previous editions.
For FSF edition 4.0, the content was thoroughly reviewed and updated.
All references to 'gawk' versions prior to 4.0 were removed.  Of
significant note for that edition was the addition of *note Debugger::.

   For FSF edition 4.1, the content has been reorganized into parts, and
the major new additions are *note Arbitrary Precision Arithmetic::, and
*note Dynamic Extensions::.

   This Info file will undoubtedly continue to evolve.  If you find an
error in the Info file, please report it!  *Note Bugs:: for information
on submitting problem reports electronically.

   ---------- Footnotes ----------

   (1) GNU stands for "GNU's Not Unix."

   (2) The terminology "GNU/Linux" is explained in the *note Glossary::.


File: gawk.info,  Node: How To Contribute,  Next: Acknowledgments,  Prev: Manual History,  Up: Preface

How to Contribute
=================

As the maintainer of GNU 'awk', I once thought that I would be able to
manage a collection of publicly available 'awk' programs and I even
solicited contributions.  Making things available on the Internet helps
keep the 'gawk' distribution down to manageable size.

   The initial collection of material, such as it is, is still available
at <ftp://ftp.freefriends.org/arnold/Awkstuff>.  In the hopes of doing
something more broad, I acquired the 'awk.info' domain.

   However, I found that I could not dedicate enough time to managing
contributed code: the archive did not grow and the domain went unused
for several years.

   Late in 2008, a volunteer took on the task of setting up an
'awk'-related website--<http://awk.info>--and did a very nice job.

   If you have written an interesting 'awk' program, or have written a
'gawk' extension that you would like to share with the rest of the
world, please see <http://awk.info/?contribute> for how to contribute it
to the website.


File: gawk.info,  Node: Acknowledgments,  Prev: How To Contribute,  Up: Preface

Acknowledgments
===============

The initial draft of 'The GAWK Manual' had the following
acknowledgments:

     Many people need to be thanked for their assistance in producing
     this manual.  Jay Fenlason contributed many ideas and sample
     programs.  Richard Mlynarik and Robert Chassell gave helpful
     comments on drafts of this manual.  The paper 'A Supplemental
     Document for AWK' by John W. Pierce of the Chemistry Department at
     UC San Diego, pinpointed several issues relevant both to 'awk'
     implementation and to this manual, that would otherwise have
     escaped us.

   I would like to acknowledge Richard M. Stallman, for his vision of a
better world and for his courage in founding the FSF and starting the
GNU Project.

   Earlier editions of this Info file had the following
acknowledgements:

     The following people (in alphabetical order) provided helpful
     comments on various versions of this book: Rick Adams, Dr. Nelson
     H.F. Beebe, Karl Berry, Dr. Michael Brennan, Rich Burridge, Claire
     Cloutier, Diane Close, Scott Deifik, Christopher ("Topher") Eliot,
     Jeffrey Friedl, Dr. Darrel Hankerson, Michal Jaegermann, Dr.
     Richard J. LeBlanc, Michael Lijewski, Pat Rankin, Miriam Robbins,
     Mary Sheehan, and Chuck Toporek.

     Robert J. Chassell provided much valuable advice on the use of
     Texinfo.  He also deserves special thanks for convincing me _not_
     to title this Info file 'How to Gawk Politely'.  Karl Berry helped
     significantly with the TeX part of Texinfo.

     I would like to thank Marshall and Elaine Hartholz of Seattle and
     Dr. Bert and Rita Schreiber of Detroit for large amounts of quiet
     vacation time in their homes, which allowed me to make significant
     progress on this Info file and on 'gawk' itself.

     Phil Hughes of SSC contributed in a very important way by loaning
     me his laptop GNU/Linux system, not once, but twice, which allowed
     me to do a lot of work while away from home.

     David Trueman deserves special credit; he has done a yeoman job of
     evolving 'gawk' so that it performs well and without bugs.
     Although he is no longer involved with 'gawk', working with him on
     this project was a significant pleasure.

     The intrepid members of the GNITS mailing list, and most notably
     Ulrich Drepper, provided invaluable help and feedback for the
     design of the internationalization features.

     Chuck Toporek, Mary Sheehan, and Claire Cloutier of O'Reilly &
     Associates contributed significant editorial help for this Info
     file for the 3.1 release of 'gawk'.

   Dr. Nelson Beebe, Andreas Buening, Dr. Manuel Collado, Antonio
Colombo, Stephen Davies, Scott Deifik, Akim Demaille, Daniel Richard G.,
Darrel Hankerson, Michal Jaegermann, Ju"rgen Kahrs, Stepan Kasal, John
Malmberg, Dave Pitts, Chet Ramey, Pat Rankin, Andrew Schorr, Corinna
Vinschen, and Eli Zaretskii (in alphabetical order) make up the current
'gawk' "crack portability team."  Without their hard work and help,
'gawk' would not be nearly the robust, portable program it is today.  It
has been and continues to be a pleasure working with this team of fine
people.

   Notable code and documentation contributions were made by a number of
people.  *Note Contributors:: for the full list.

   Thanks to Michael Brennan for the Forewords.

   Thanks to Patrice Dumas for the new 'makeinfo' program.  Thanks to
Karl Berry, who continues to work to keep the Texinfo markup language
sane.

   Robert P.J. Day, Michael Brennan, and Brian Kernighan kindly acted as
reviewers for the 2015 edition of this Info file.  Their feedback helped
improve the final work.

   I would also like to thank Brian Kernighan for his invaluable
assistance during the testing and debugging of 'gawk', and for his
ongoing help and advice in clarifying numerous points about the
language.  We could not have done nearly as good a job on either 'gawk'
or its documentation without his help.

   Brian is in a class by himself as a programmer and technical author.
I have to thank him (yet again) for his ongoing friendship and for being
a role model to me for close to 30 years!  Having him as a reviewer is
an exciting privilege.  It has also been extremely humbling...

   I must thank my wonderful wife, Miriam, for her patience through the
many versions of this project, for her proofreading, and for sharing me
with the computer.  I would like to thank my parents for their love, and
for the grace with which they raised and educated me.  Finally, I also
must acknowledge my gratitude to G-d, for the many opportunities He has
sent my way, as well as for the gifts He has given me with which to take
advantage of those opportunities.


Arnold Robbins
Nof Ayalon
Israel
February 2015


File: gawk.info,  Node: Getting Started,  Next: Invoking Gawk,  Prev: Preface,  Up: Top

1 Getting Started with 'awk'
****************************

The basic function of 'awk' is to search files for lines (or other units
of text) that contain certain patterns.  When a line matches one of the
patterns, 'awk' performs specified actions on that line.  'awk'
continues to process input lines in this way until it reaches the end of
the input files.

   Programs in 'awk' are different from programs in most other
languages, because 'awk' programs are "data driven" (i.e., you describe
the data you want to work with and then what to do when you find it).
Most other languages are "procedural"; you have to describe, in great
detail, every step the program should take.  When working with
procedural languages, it is usually much harder to clearly describe the
data your program will process.  For this reason, 'awk' programs are
often refreshingly easy to read and write.

   When you run 'awk', you specify an 'awk' "program" that tells 'awk'
what to do.  The program consists of a series of "rules" (it may also
contain "function definitions", an advanced feature that we will ignore
for now; *note User-defined::).  Each rule specifies one pattern to
search for and one action to perform upon finding the pattern.

   Syntactically, a rule consists of a "pattern" followed by an
"action".  The action is enclosed in braces to separate it from the
pattern.  Newlines usually separate rules.  Therefore, an 'awk' program
looks like this:

     PATTERN { ACTION }
     PATTERN { ACTION }
     ...

* Menu:

* Running gawk::                How to run 'gawk' programs; includes
                                command-line syntax.
* Sample Data Files::           Sample data files for use in the 'awk'
                                programs illustrated in this Info file.
* Very Simple::                 A very simple example.
* Two Rules::                   A less simple one-line example using two
                                rules.
* More Complex::                A more complex example.
* Statements/Lines::            Subdividing or combining statements into
                                lines.
* Other Features::              Other Features of 'awk'.
* When::                        When to use 'gawk' and when to use
                                other things.
* Intro Summary::               Summary of the introduction.


File: gawk.info,  Node: Running gawk,  Next: Sample Data Files,  Up: Getting Started

1.1 How to Run 'awk' Programs
=============================

There are several ways to run an 'awk' program.  If the program is
short, it is easiest to include it in the command that runs 'awk', like
this:

     awk 'PROGRAM' INPUT-FILE1 INPUT-FILE2 ...

   When the program is long, it is usually more convenient to put it in
a file and run it with a command like this:

     awk -f PROGRAM-FILE INPUT-FILE1 INPUT-FILE2 ...

   This minor node discusses both mechanisms, along with several
variations of each.

* Menu:

* One-shot::                    Running a short throwaway 'awk'
                                program.
* Read Terminal::               Using no input files (input from the keyboard
                                instead).
* Long::                        Putting permanent 'awk' programs in
                                files.
* Executable Scripts::          Making self-contained 'awk' programs.
* Comments::                    Adding documentation to 'gawk'
                                programs.
* Quoting::                     More discussion of shell quoting issues.


File: gawk.info,  Node: One-shot,  Next: Read Terminal,  Up: Running gawk

1.1.1 One-Shot Throwaway 'awk' Programs
---------------------------------------

Once you are familiar with 'awk', you will often type in simple programs
the moment you want to use them.  Then you can write the program as the
first argument of the 'awk' command, like this:

     awk 'PROGRAM' INPUT-FILE1 INPUT-FILE2 ...

where PROGRAM consists of a series of patterns and actions, as described
earlier.

   This command format instructs the "shell", or command interpreter, to
start 'awk' and use the PROGRAM to process records in the input file(s).
There are single quotes around PROGRAM so the shell won't interpret any
'awk' characters as special shell characters.  The quotes also cause the
shell to treat all of PROGRAM as a single argument for 'awk', and allow
PROGRAM to be more than one line long.

   This format is also useful for running short or medium-sized 'awk'
programs from shell scripts, because it avoids the need for a separate
file for the 'awk' program.  A self-contained shell script is more
reliable because there are no other files to misplace.

   Later in this chapter, in *note Very Simple::, we'll see examples of
several short, self-contained programs.


File: gawk.info,  Node: Read Terminal,  Next: Long,  Prev: One-shot,  Up: Running gawk

1.1.2 Running 'awk' Without Input Files
---------------------------------------

You can also run 'awk' without any input files.  If you type the
following command line:

     awk 'PROGRAM'

'awk' applies the PROGRAM to the "standard input", which usually means
whatever you type on the keyboard.  This continues until you indicate
end-of-file by typing 'Ctrl-d'.  (On non-POSIX operating systems, the
end-of-file character may be different.  For example, on OS/2, it is
'Ctrl-z'.)

   As an example, the following program prints a friendly piece of
advice (from Douglas Adams's 'The Hitchhiker's Guide to the Galaxy'), to
keep you from worrying about the complexities of computer programming:

     $ awk 'BEGIN { print "Don\47t Panic!" }'
     -| Don't Panic!

   'awk' executes statements associated with 'BEGIN' before reading any
input.  If there are no other statements in your program, as is the case
here, 'awk' just stops, instead of trying to read input it doesn't know
how to process.  The '\47' is a magic way (explained later) of getting a
single quote into the program, without having to engage in ugly shell
quoting tricks.

     NOTE: If you use Bash as your shell, you should execute the command
     'set +H' before running this program interactively, to disable the
     C shell-style command history, which treats '!' as a special
     character.  We recommend putting this command into your personal
     startup file.

   This next simple 'awk' program emulates the 'cat' utility; it copies
whatever you type on the keyboard to its standard output (why this works
is explained shortly):

     $ awk '{ print }'
     Now is the time for all good men
     -| Now is the time for all good men
     to come to the aid of their country.
     -| to come to the aid of their country.
     Four score and seven years ago, ...
     -| Four score and seven years ago, ...
     What, me worry?
     -| What, me worry?
     Ctrl-d


File: gawk.info,  Node: Long,  Next: Executable Scripts,  Prev: Read Terminal,  Up: Running gawk

1.1.3 Running Long Programs
---------------------------

Sometimes 'awk' programs are very long.  In these cases, it is more
convenient to put the program into a separate file.  In order to tell
'awk' to use that file for its program, you type:

     awk -f SOURCE-FILE INPUT-FILE1 INPUT-FILE2 ...

   The '-f' instructs the 'awk' utility to get the 'awk' program from
the file SOURCE-FILE (*note Options::).  Any file name can be used for
SOURCE-FILE.  For example, you could put the program:

     BEGIN { print "Don't Panic!" }

into the file 'advice'.  Then this command:

     awk -f advice

does the same thing as this one:

     awk 'BEGIN { print "Don\47t Panic!" }'

This was explained earlier (*note Read Terminal::).  Note that you don't
usually need single quotes around the file name that you specify with
'-f', because most file names don't contain any of the shell's special
characters.  Notice that in 'advice', the 'awk' program did not have
single quotes around it.  The quotes are only needed for programs that
are provided on the 'awk' command line.  (Also, placing the program in a
file allows us to use a literal single quote in the program text,
instead of the magic '\47'.)

   If you want to clearly identify an 'awk' program file as such, you
can add the extension '.awk' to the file name.  This doesn't affect the
execution of the 'awk' program but it does make "housekeeping" easier.


File: gawk.info,  Node: Executable Scripts,  Next: Comments,  Prev: Long,  Up: Running gawk

1.1.4 Executable 'awk' Programs
-------------------------------

Once you have learned 'awk', you may want to write self-contained 'awk'
scripts, using the '#!' script mechanism.  You can do this on many
systems.(1)  For example, you could update the file 'advice' to look
like this:

     #! /bin/awk -f

     BEGIN { print "Don't Panic!" }

After making this file executable (with the 'chmod' utility), simply
type 'advice' at the shell and the system arranges to run 'awk' as if
you had typed 'awk -f advice':

     $ chmod +x advice
     $ advice
     -| Don't Panic!

(We assume you have the current directory in your shell's search path
variable [typically '$PATH'].  If not, you may need to type './advice'
at the shell.)

   Self-contained 'awk' scripts are useful when you want to write a
program that users can invoke without their having to know that the
program is written in 'awk'.

                          Understanding '#!'

   'awk' is an "interpreted" language.  This means that the 'awk'
utility reads your program and then processes your data according to the
instructions in your program.  (This is different from a "compiled"
language such as C, where your program is first compiled into machine
code that is executed directly by your system's processor.)  The 'awk'
utility is thus termed an "interpreter".  Many modern languages are
interpreted.

   The line beginning with '#!' lists the full file name of an
interpreter to run and a single optional initial command-line argument
to pass to that interpreter.  The operating system then runs the
interpreter with the given argument and the full argument list of the
executed program.  The first argument in the list is the full file name
of the 'awk' program.  The rest of the argument list contains either
options to 'awk', or data files, or both.  (Note that on many systems
'awk' may be found in '/usr/bin' instead of in '/bin'.)

   Some systems limit the length of the interpreter name to 32
characters.  Often, this can be dealt with by using a symbolic link.

   You should not put more than one argument on the '#!' line after the
path to 'awk'.  It does not work.  The operating system treats the rest
of the line as a single argument and passes it to 'awk'.  Doing this
leads to confusing behavior--most likely a usage diagnostic of some sort
from 'awk'.

   Finally, the value of 'ARGV[0]' (*note Built-in Variables::) varies
depending upon your operating system.  Some systems put 'awk' there,
some put the full pathname of 'awk' (such as '/bin/awk'), and some put
the name of your script ('advice').  (d.c.)  Don't rely on the value of
'ARGV[0]' to provide your script name.

   ---------- Footnotes ----------

   (1) The '#!' mechanism works on GNU/Linux systems, BSD-based systems,
and commercial Unix systems.


File: gawk.info,  Node: Comments,  Next: Quoting,  Prev: Executable Scripts,  Up: Running gawk

1.1.5 Comments in 'awk' Programs
--------------------------------

A "comment" is some text that is included in a program for the sake of
human readers; it is not really an executable part of the program.
Comments can explain what the program does and how it works.  Nearly all
programming languages have provisions for comments, as programs are
typically hard to understand without them.

   In the 'awk' language, a comment starts with the number sign
character ('#') and continues to the end of the line.  The '#' does not
have to be the first character on the line.  The 'awk' language ignores
the rest of a line following a number sign.  For example, we could have
put the following into 'advice':

     # This program prints a nice, friendly message.  It helps
     # keep novice users from being afraid of the computer.
     BEGIN    { print "Don't Panic!" }

   You can put comment lines into keyboard-composed throwaway 'awk'
programs, but this usually isn't very useful; the purpose of a comment
is to help you or another person understand the program when reading it
at a later time.

     CAUTION: As mentioned in *note One-shot::, you can enclose short to
     medium-sized programs in single quotes, in order to keep your shell
     scripts self-contained.  When doing so, _don't_ put an apostrophe
     (i.e., a single quote) into a comment (or anywhere else in your
     program).  The shell interprets the quote as the closing quote for
     the entire program.  As a result, usually the shell prints a
     message about mismatched quotes, and if 'awk' actually runs, it
     will probably print strange messages about syntax errors.  For
     example, look at the following:

          $ awk 'BEGIN { print "hello" } # let's be cute'
          >

     The shell sees that the first two quotes match, and that a new
     quoted object begins at the end of the command line.  It therefore
     prompts with the secondary prompt, waiting for more input.  With
     Unix 'awk', closing the quoted string produces this result:

          $ awk '{ print "hello" } # let's be cute'
          > '
          error-> awk: can't open file be
          error->  source line number 1

     Putting a backslash before the single quote in 'let's' wouldn't
     help, because backslashes are not special inside single quotes.
     The next node describes the shell's quoting rules.


File: gawk.info,  Node: Quoting,  Prev: Comments,  Up: Running gawk

1.1.6 Shell Quoting Issues
--------------------------

* Menu:

* DOS Quoting::                 Quoting in Windows Batch Files.

For short to medium-length 'awk' programs, it is most convenient to
enter the program on the 'awk' command line.  This is best done by
enclosing the entire program in single quotes.  This is true whether you
are entering the program interactively at the shell prompt, or writing
it as part of a larger shell script:

     awk 'PROGRAM TEXT' INPUT-FILE1 INPUT-FILE2 ...

   Once you are working with the shell, it is helpful to have a basic
knowledge of shell quoting rules.  The following rules apply only to
POSIX-compliant, Bourne-style shells (such as Bash, the GNU Bourne-Again
Shell).  If you use the C shell, you're on your own.

   Before diving into the rules, we introduce a concept that appears
throughout this Info file, which is that of the "null", or empty,
string.

   The null string is character data that has no value.  In other words,
it is empty.  It is written in 'awk' programs like this: '""'.  In the
shell, it can be written using single or double quotes: '""' or ''''.
Although the null string has no characters in it, it does exist.  For
example, consider this command:

     $ echo ""

Here, the 'echo' utility receives a single argument, even though that
argument has no characters in it.  In the rest of this Info file, we use
the terms "null string" and "empty string" interchangeably.  Now, on to
the quoting rules:

   * Quoted items can be concatenated with nonquoted items as well as
     with other quoted items.  The shell turns everything into one
     argument for the command.

   * Preceding any single character with a backslash ('\') quotes that
     character.  The shell removes the backslash and passes the quoted
     character on to the command.

   * Single quotes protect everything between the opening and closing
     quotes.  The shell does no interpretation of the quoted text,
     passing it on verbatim to the command.  It is _impossible_ to embed
     a single quote inside single-quoted text.  Refer back to *note
     Comments:: for an example of what happens if you try.

   * Double quotes protect most things between the opening and closing
     quotes.  The shell does at least variable and command substitution
     on the quoted text.  Different shells may do additional kinds of
     processing on double-quoted text.

     Because certain characters within double-quoted text are processed
     by the shell, they must be "escaped" within the text.  Of note are
     the characters '$', '`', '\', and '"', all of which must be
     preceded by a backslash within double-quoted text if they are to be
     passed on literally to the program.  (The leading backslash is
     stripped first.)  Thus, the example seen in *note Read Terminal:::

          awk 'BEGIN { print "Don\47t Panic!" }'

     could instead be written this way:

          $ awk "BEGIN { print \"Don't Panic!\" }"
          -| Don't Panic!

     Note that the single quote is not special within double quotes.

   * Null strings are removed when they occur as part of a non-null
     command-line argument, while explicit null objects are kept.  For
     example, to specify that the field separator 'FS' should be set to
     the null string, use:

          awk -F "" 'PROGRAM' FILES # correct

     Don't use this:

          awk -F"" 'PROGRAM' FILES  # wrong!

     In the second case, 'awk' attempts to use the text of the program
     as the value of 'FS', and the first file name as the text of the
     program!  This results in syntax errors at best, and confusing
     behavior at worst.

   Mixing single and double quotes is difficult.  You have to resort to
shell quoting tricks, like this:

     $ awk 'BEGIN { print "Here is a single quote <'"'"'>" }'
     -| Here is a single quote <'>

This program consists of three concatenated quoted strings.  The first
and the third are single-quoted, and the second is double-quoted.

   This can be "simplified" to:

     $ awk 'BEGIN { print "Here is a single quote <'\''>" }'
     -| Here is a single quote <'>

Judge for yourself which of these two is the more readable.

   Another option is to use double quotes, escaping the embedded,
'awk'-level double quotes:

     $ awk "BEGIN { print \"Here is a single quote <'>\" }"
     -| Here is a single quote <'>

This option is also painful, because double quotes, backslashes, and
dollar signs are very common in more advanced 'awk' programs.

   A third option is to use the octal escape sequence equivalents (*note
Escape Sequences::) for the single- and double-quote characters, like
so:

     $ awk 'BEGIN { print "Here is a single quote <\47>" }'
     -| Here is a single quote <'>
     $ awk 'BEGIN { print "Here is a double quote <\42>" }'
     -| Here is a double quote <">

This works nicely, but you should comment clearly what the escapes mean.

   A fourth option is to use command-line variable assignment, like
this:

     $ awk -v sq="'" 'BEGIN { print "Here is a single quote <" sq ">" }'
     -| Here is a single quote <'>

   (Here, the two string constants and the value of 'sq' are
concatenated into a single string that is printed by 'print'.)

   If you really need both single and double quotes in your 'awk'
program, it is probably best to move it into a separate file, where the
shell won't be part of the picture and you can say what you mean.


File: gawk.info,  Node: DOS Quoting,  Up: Quoting

1.1.6.1 Quoting in MS-Windows Batch Files
.........................................

Although this Info file generally only worries about POSIX systems and
the POSIX shell, the following issue arises often enough for many users
that it is worth addressing.

   The "shells" on Microsoft Windows systems use the double-quote
character for quoting, and make it difficult or impossible to include an
escaped double-quote character in a command-line script.  The following
example, courtesy of Jeroen Brink, shows how to print all lines in a
file surrounded by double quotes:

     gawk "{ print \"\042\" $0 \"\042\" }" FILE


File: gawk.info,  Node: Sample Data Files,  Next: Very Simple,  Prev: Running gawk,  Up: Getting Started

1.2 Data files for the Examples
===============================

Many of the examples in this Info file take their input from two sample
data files.  The first, 'mail-list', represents a list of peoples' names
together with their email addresses and information about those people.
The second data file, called 'inventory-shipped', contains information
about monthly shipments.  In both files, each line is considered to be
one "record".

   In 'mail-list', each record contains the name of a person, his/her
phone number, his/her email address, and a code for his/her relationship
with the author of the list.  The columns are aligned using spaces.  An
'A' in the last column means that the person is an acquaintance.  An 'F'
in the last column means that the person is a friend.  An 'R' means that
the person is a relative:

     Amelia       555-5553     amelia.zodiacusque@gmail.com    F
     Anthony      555-3412     anthony.asserturo@hotmail.com   A
     Becky        555-7685     becky.algebrarum@gmail.com      A
     Bill         555-1675     bill.drowning@hotmail.com       A
     Broderick    555-0542     broderick.aliquotiens@yahoo.com R
     Camilla      555-2912     camilla.infusarum@skynet.be     R
     Fabius       555-1234     fabius.undevicesimus@ucb.edu    F
     Julie        555-6699     julie.perscrutabor@skeeve.com   F
     Martin       555-6480     martin.codicibus@hotmail.com    A
     Samuel       555-3430     samuel.lanceolis@shu.edu        A
     Jean-Paul    555-2127     jeanpaul.campanorum@nyu.edu     R

   The data file 'inventory-shipped' represents information about
shipments during the year.  Each record contains the month, the number
of green crates shipped, the number of red boxes shipped, the number of
orange bags shipped, and the number of blue packages shipped,
respectively.  There are 16 entries, covering the 12 months of last year
and the first four months of the current year.  An empty line separates
the data for the two years:

     Jan  13  25  15 115
     Feb  15  32  24 226
     Mar  15  24  34 228
     Apr  31  52  63 420
     May  16  34  29 208
     Jun  31  42  75 492
     Jul  24  34  67 436
     Aug  15  34  47 316
     Sep  13  55  37 277
     Oct  29  54  68 525
     Nov  20  87  82 577
     Dec  17  35  61 401

     Jan  21  36  64 620
     Feb  26  58  80 652
     Mar  24  75  70 495
     Apr  21  70  74 514

   The sample files are included in the 'gawk' distribution, in the
directory 'awklib/eg/data'.


File: gawk.info,  Node: Very Simple,  Next: Two Rules,  Prev: Sample Data Files,  Up: Getting Started

1.3 Some Simple Examples
========================

The following command runs a simple 'awk' program that searches the
input file 'mail-list' for the character string 'li' (a grouping of
characters is usually called a "string"; the term "string" is based on
similar usage in English, such as "a string of pearls" or "a string of
cars in a train"):

     awk '/li/ { print $0 }' mail-list

When lines containing 'li' are found, they are printed because
'print $0' means print the current line.  (Just 'print' by itself means
the same thing, so we could have written that instead.)

   You will notice that slashes ('/') surround the string 'li' in the
'awk' program.  The slashes indicate that 'li' is the pattern to search
for.  This type of pattern is called a "regular expression", which is
covered in more detail later (*note Regexp::).  The pattern is allowed
to match parts of words.  There are single quotes around the 'awk'
program so that the shell won't interpret any of it as special shell
characters.

   Here is what this program prints:

     $ awk '/li/ { print $0 }' mail-list
     -| Amelia       555-5553     amelia.zodiacusque@gmail.com    F
     -| Broderick    555-0542     broderick.aliquotiens@yahoo.com R
     -| Julie        555-6699     julie.perscrutabor@skeeve.com   F
     -| Samuel       555-3430     samuel.lanceolis@shu.edu        A

   In an 'awk' rule, either the pattern or the action can be omitted,
but not both.  If the pattern is omitted, then the action is performed
for _every_ input line.  If the action is omitted, the default action is
to print all lines that match the pattern.

   Thus, we could leave out the action (the 'print' statement and the
braces) in the previous example and the result would be the same: 'awk'
prints all lines matching the pattern 'li'.  By comparison, omitting the
'print' statement but retaining the braces makes an empty action that
does nothing (i.e., no lines are printed).

   Many practical 'awk' programs are just a line or two long.  Following
is a collection of useful, short programs to get you started.  Some of
these programs contain constructs that haven't been covered yet.  (The
description of the program will give you a good idea of what is going
on, but you'll need to read the rest of the Info file to become an 'awk'
expert!)  Most of the examples use a data file named 'data'.  This is
just a placeholder; if you use these programs yourself, substitute your
own file names for 'data'.  For future reference, note that there is
often more than one way to do things in 'awk'.  At some point, you may
want to look back at these examples and see if you can come up with
different ways to do the same things shown here:

   * Print every line that is longer than 80 characters:

          awk 'length($0) > 80' data

     The sole rule has a relational expression as its pattern and has no
     action--so it uses the default action, printing the record.

   * Print the length of the longest input line:

          awk '{ if (length($0) > max) max = length($0) }
               END { print max }' data

     The code associated with 'END' executes after all input has been
     read; it's the other side of the coin to 'BEGIN'.

   * Print the length of the longest line in 'data':

          expand data | awk '{ if (x < length($0)) x = length($0) }
                             END { print "maximum line length is " x }'

     This example differs slightly from the previous one: the input is
     processed by the 'expand' utility to change TABs into spaces, so
     the widths compared are actually the right-margin columns, as
     opposed to the number of input characters on each line.

   * Print every line that has at least one field:

          awk 'NF > 0' data

     This is an easy way to delete blank lines from a file (or rather,
     to create a new file similar to the old file but from which the
     blank lines have been removed).

   * Print seven random numbers from 0 to 100, inclusive:

          awk 'BEGIN { for (i = 1; i <= 7; i++)
                           print int(101 * rand()) }'

   * Print the total number of bytes used by FILES:

          ls -l FILES | awk '{ x += $5 }
                             END { print "total bytes: " x }'

   * Print the total number of kilobytes used by FILES:

          ls -l FILES | awk '{ x += $5 }
             END { print "total K-bytes:", x / 1024 }'

   * Print a sorted list of the login names of all users:

          awk -F: '{ print $1 }' /etc/passwd | sort

   * Count the lines in a file:

          awk 'END { print NR }' data

   * Print the even-numbered lines in the data file:

          awk 'NR % 2 == 0' data

     If you used the expression 'NR % 2 == 1' instead, the program would
     print the odd-numbered lines.


File: gawk.info,  Node: Two Rules,  Next: More Complex,  Prev: Very Simple,  Up: Getting Started

1.4 An Example with Two Rules
=============================

The 'awk' utility reads the input files one line at a time.  For each
line, 'awk' tries the patterns of each rule.  If several patterns match,
then several actions execute in the order in which they appear in the
'awk' program.  If no patterns match, then no actions run.

   After processing all the rules that match the line (and perhaps there
are none), 'awk' reads the next line.  (However, *note Next Statement::
and also *note Nextfile Statement::.)  This continues until the program
reaches the end of the file.  For example, the following 'awk' program
contains two rules:

     /12/  { print $0 }
     /21/  { print $0 }

The first rule has the string '12' as the pattern and 'print $0' as the
action.  The second rule has the string '21' as the pattern and also has
'print $0' as the action.  Each rule's action is enclosed in its own
pair of braces.

   This program prints every line that contains the string '12' _or_ the
string '21'.  If a line contains both strings, it is printed twice, once
by each rule.

   This is what happens if we run this program on our two sample data
files, 'mail-list' and 'inventory-shipped':

     $ awk '/12/ { print $0 }
     >      /21/ { print $0 }' mail-list inventory-shipped
     -| Anthony      555-3412     anthony.asserturo@hotmail.com   A
     -| Camilla      555-2912     camilla.infusarum@skynet.be     R
     -| Fabius       555-1234     fabius.undevicesimus@ucb.edu    F
     -| Jean-Paul    555-2127     jeanpaul.campanorum@nyu.edu     R
     -| Jean-Paul    555-2127     jeanpaul.campanorum@nyu.edu     R
     -| Jan  21  36  64 620
     -| Apr  21  70  74 514

Note how the line beginning with 'Jean-Paul' in 'mail-list' was printed
twice, once for each rule.


File: gawk.info,  Node: More Complex,  Next: Statements/Lines,  Prev: Two Rules,  Up: Getting Started

1.5 A More Complex Example
==========================

Now that we've mastered some simple tasks, let's look at what typical
'awk' programs do.  This example shows how 'awk' can be used to
summarize, select, and rearrange the output of another utility.  It uses
features that haven't been covered yet, so don't worry if you don't
understand all the details:

     ls -l | awk '$6 == "Nov" { sum += $5 }
                  END { print sum }'

   This command prints the total number of bytes in all the files in the
current directory that were last modified in November (of any year).
The 'ls -l' part of this example is a system command that gives you a
listing of the files in a directory, including each file's size and the
date the file was last modified.  Its output looks like this:

     -rw-r--r--  1 arnold   user   1933 Nov  7 13:05 Makefile
     -rw-r--r--  1 arnold   user  10809 Nov  7 13:03 awk.h
     -rw-r--r--  1 arnold   user    983 Apr 13 12:14 awk.tab.h
     -rw-r--r--  1 arnold   user  31869 Jun 15 12:20 awkgram.y
     -rw-r--r--  1 arnold   user  22414 Nov  7 13:03 awk1.c
     -rw-r--r--  1 arnold   user  37455 Nov  7 13:03 awk2.c
     -rw-r--r--  1 arnold   user  27511 Dec  9 13:07 awk3.c
     -rw-r--r--  1 arnold   user   7989 Nov  7 13:03 awk4.c

The first field contains read-write permissions, the second field
contains the number of links to the file, and the third field identifies
the file's owner.  The fourth field identifies the file's group.  The
fifth field contains the file's size in bytes.  The sixth, seventh, and
eighth fields contain the month, day, and time, respectively, that the
file was last modified.  Finally, the ninth field contains the file
name.

   The '$6 == "Nov"' in our 'awk' program is an expression that tests
whether the sixth field of the output from 'ls -l' matches the string
'Nov'.  Each time a line has the string 'Nov' for its sixth field, 'awk'
performs the action 'sum += $5'.  This adds the fifth field (the file's
size) to the variable 'sum'.  As a result, when 'awk' has finished
reading all the input lines, 'sum' is the total of the sizes of the
files whose lines matched the pattern.  (This works because 'awk'
variables are automatically initialized to zero.)

   After the last line of output from 'ls' has been processed, the 'END'
rule executes and prints the value of 'sum'.  In this example, the value
of 'sum' is 80600.

   These more advanced 'awk' techniques are covered in later minor nodes
(*note Action Overview::).  Before you can move on to more advanced
'awk' programming, you have to know how 'awk' interprets your input and
displays your output.  By manipulating fields and using 'print'
statements, you can produce some very useful and impressive-looking
reports.


File: gawk.info,  Node: Statements/Lines,  Next: Other Features,  Prev: More Complex,  Up: Getting Started

1.6 'awk' Statements Versus Lines
=================================

Most often, each line in an 'awk' program is a separate statement or
separate rule, like this:

     awk '/12/  { print $0 }
          /21/  { print $0 }' mail-list inventory-shipped

   However, 'gawk' ignores newlines after any of the following symbols
and keywords:

     ,    {    ?    :    ||    &&    do    else

A newline at any other point is considered the end of the statement.(1)

   If you would like to split a single statement into two lines at a
point where a newline would terminate it, you can "continue" it by
ending the first line with a backslash character ('\').  The backslash
must be the final character on the line in order to be recognized as a
continuation character.  A backslash is allowed anywhere in the
statement, even in the middle of a string or regular expression.  For
example:

     awk '/This regular expression is too long, so continue it\
      on the next line/ { print $1 }'

We have generally not used backslash continuation in our sample
programs.  'gawk' places no limit on the length of a line, so backslash
continuation is never strictly necessary; it just makes programs more
readable.  For this same reason, as well as for clarity, we have kept
most statements short in the programs presented throughout the Info
file.  Backslash continuation is most useful when your 'awk' program is
in a separate source file instead of entered from the command line.  You
should also note that many 'awk' implementations are more particular
about where you may use backslash continuation.  For example, they may
not allow you to split a string constant using backslash continuation.
Thus, for maximum portability of your 'awk' programs, it is best not to
split your lines in the middle of a regular expression or a string.

     CAUTION: _Backslash continuation does not work as described with
     the C shell._  It works for 'awk' programs in files and for
     one-shot programs, _provided_ you are using a POSIX-compliant
     shell, such as the Unix Bourne shell or Bash.  But the C shell
     behaves differently!  There you must use two backslashes in a row,
     followed by a newline.  Note also that when using the C shell,
     _every_ newline in your 'awk' program must be escaped with a
     backslash.  To illustrate:

          % awk 'BEGIN { \
          ?   print \\
          ?       "hello, world" \
          ? }'
          -| hello, world

     Here, the '%' and '?' are the C shell's primary and secondary
     prompts, analogous to the standard shell's '$' and '>'.

     Compare the previous example to how it is done with a
     POSIX-compliant shell:

          $ awk 'BEGIN {
          >   print \
          >       "hello, world"
          > }'
          -| hello, world

   'awk' is a line-oriented language.  Each rule's action has to begin
on the same line as the pattern.  To have the pattern and action on
separate lines, you _must_ use backslash continuation; there is no other
option.

   Another thing to keep in mind is that backslash continuation and
comments do not mix.  As soon as 'awk' sees the '#' that starts a
comment, it ignores _everything_ on the rest of the line.  For example:

     $ gawk 'BEGIN { print "dont panic" # a friendly \
     >                                    BEGIN rule
     > }'
     error-> gawk: cmd. line:2:                BEGIN rule
     error-> gawk: cmd. line:2:                ^ syntax error

In this case, it looks like the backslash would continue the comment
onto the next line.  However, the backslash-newline combination is never
even noticed because it is "hidden" inside the comment.  Thus, the
'BEGIN' is noted as a syntax error.

   When 'awk' statements within one rule are short, you might want to
put more than one of them on a line.  This is accomplished by separating
the statements with a semicolon (';').  This also applies to the rules
themselves.  Thus, the program shown at the start of this minor node
could also be written this way:

     /12/ { print $0 } ; /21/ { print $0 }

     NOTE: The requirement that states that rules on the same line must
     be separated with a semicolon was not in the original 'awk'
     language; it was added for consistency with the treatment of
     statements within an action.

   ---------- Footnotes ----------

   (1) The '?' and ':' referred to here is the three-operand conditional
expression described in *note Conditional Exp::.  Splitting lines after
'?' and ':' is a minor 'gawk' extension; if '--posix' is specified
(*note Options::), then this extension is disabled.


File: gawk.info,  Node: Other Features,  Next: When,  Prev: Statements/Lines,  Up: Getting Started

1.7 Other Features of 'awk'
===========================

The 'awk' language provides a number of predefined, or "built-in",
variables that your programs can use to get information from 'awk'.
There are other variables your program can set as well to control how
'awk' processes your data.

   In addition, 'awk' provides a number of built-in functions for doing
common computational and string-related operations.  'gawk' provides
built-in functions for working with timestamps, performing bit
manipulation, for runtime string translation (internationalization),
determining the type of a variable, and array sorting.

   As we develop our presentation of the 'awk' language, we will
introduce most of the variables and many of the functions.  They are
described systematically in *note Built-in Variables:: and in *note
Built-in::.


File: gawk.info,  Node: When,  Next: Intro Summary,  Prev: Other Features,  Up: Getting Started

1.8 When to Use 'awk'
=====================

Now that you've seen some of what 'awk' can do, you might wonder how
'awk' could be useful for you.  By using utility programs, advanced
patterns, field separators, arithmetic statements, and other selection
criteria, you can produce much more complex output.  The 'awk' language
is very useful for producing reports from large amounts of raw data,
such as summarizing information from the output of other utility
programs like 'ls'.  (*Note More Complex::.)

   Programs written with 'awk' are usually much smaller than they would
be in other languages.  This makes 'awk' programs easy to compose and
use.  Often, 'awk' programs can be quickly composed at your keyboard,
used once, and thrown away.  Because 'awk' programs are interpreted, you
can avoid the (usually lengthy) compilation part of the typical
edit-compile-test-debug cycle of software development.

   Complex programs have been written in 'awk', including a complete
retargetable assembler for eight-bit microprocessors (*note Glossary::,
for more information), and a microcode assembler for a special-purpose
Prolog computer.  The original 'awk''s capabilities were strained by
tasks of such complexity, but modern versions are more capable.

   If you find yourself writing 'awk' scripts of more than, say, a few
hundred lines, you might consider using a different programming
language.  The shell is good at string and pattern matching; in
addition, it allows powerful use of the system utilities.  Python offers
a nice balance between high-level ease of programming and access to
system facilities.(1)

   ---------- Footnotes ----------

   (1) Other popular scripting languages include Ruby and Perl.


File: gawk.info,  Node: Intro Summary,  Prev: When,  Up: Getting Started

1.9 Summary
===========

   * Programs in 'awk' consist of PATTERN-ACTION pairs.

   * An ACTION without a PATTERN always runs.  The default ACTION for a
     pattern without one is '{ print $0 }'.

   * Use either 'awk 'PROGRAM' FILES' or 'awk -f PROGRAM-FILE FILES' to
     run 'awk'.

   * You may use the special '#!' header line to create 'awk' programs
     that are directly executable.

   * Comments in 'awk' programs start with '#' and continue to the end
     of the same line.

   * Be aware of quoting issues when writing 'awk' programs as part of a
     larger shell script (or MS-Windows batch file).

   * You may use backslash continuation to continue a source line.
     Lines are automatically continued after a comma, open brace,
     question mark, colon, '||', '&&', 'do', and 'else'.


File: gawk.info,  Node: Invoking Gawk,  Next: Regexp,  Prev: Getting Started,  Up: Top

2 Running 'awk' and 'gawk'
**************************

This major node covers how to run 'awk', both POSIX-standard and
'gawk'-specific command-line options, and what 'awk' and 'gawk' do with
nonoption arguments.  It then proceeds to cover how 'gawk' searches for
source files, reading standard input along with other files, 'gawk''s
environment variables, 'gawk''s exit status, using include files, and
obsolete and undocumented options and/or features.

   Many of the options and features described here are discussed in more
detail later in the Info file; feel free to skip over things in this
major node that don't interest you right now.

* Menu:

* Command Line::                How to run 'awk'.
* Options::                     Command-line options and their meanings.
* Other Arguments::             Input file names and variable assignments.
* Naming Standard Input::       How to specify standard input with other
                                files.
* Environment Variables::       The environment variables 'gawk' uses.
* Exit Status::                 'gawk''s exit status.
* Include Files::               Including other files into your program.
* Loading Shared Libraries::    Loading shared libraries into your program.
* Obsolete::                    Obsolete Options and/or features.
* Undocumented::                Undocumented Options and Features.
* Invoking Summary::            Invocation summary.


File: gawk.info,  Node: Command Line,  Next: Options,  Up: Invoking Gawk

2.1 Invoking 'awk'
==================

There are two ways to run 'awk'--with an explicit program or with one or
more program files.  Here are templates for both of them; items enclosed
in [...] in these templates are optional:

     'awk' [OPTIONS] '-f' PROGFILE ['--'] FILE ...
     'awk' [OPTIONS] ['--'] ''PROGRAM'' FILE ...

   In addition to traditional one-letter POSIX-style options, 'gawk'
also supports GNU long options.

   It is possible to invoke 'awk' with an empty program:

     awk '' datafile1 datafile2

Doing so makes little sense, though; 'awk' exits silently when given an
empty program.  (d.c.)  If '--lint' has been specified on the command
line, 'gawk' issues a warning that the program is empty.


File: gawk.info,  Node: Options,  Next: Other Arguments,  Prev: Command Line,  Up: Invoking Gawk

2.2 Command-Line Options
========================

Options begin with a dash and consist of a single character.  GNU-style
long options consist of two dashes and a keyword.  The keyword can be
abbreviated, as long as the abbreviation allows the option to be
uniquely identified.  If the option takes an argument, either the
keyword is immediately followed by an equals sign ('=') and the
argument's value, or the keyword and the argument's value are separated
by whitespace.  If a particular option with a value is given more than
once, it is the last value that counts.

   Each long option for 'gawk' has a corresponding POSIX-style short
option.  The long and short options are interchangeable in all contexts.
The following list describes options mandated by the POSIX standard:

'-F FS'
'--field-separator FS'
     Set the 'FS' variable to FS (*note Field Separators::).

'-f SOURCE-FILE'
'--file SOURCE-FILE'
     Read the 'awk' program source from SOURCE-FILE instead of in the
     first nonoption argument.  This option may be given multiple times;
     the 'awk' program consists of the concatenation of the contents of
     each specified SOURCE-FILE.

'-v VAR=VAL'
'--assign VAR=VAL'
     Set the variable VAR to the value VAL _before_ execution of the
     program begins.  Such variable values are available inside the
     'BEGIN' rule (*note Other Arguments::).

     The '-v' option can only set one variable, but it can be used more
     than once, setting another variable each time, like this: 'awk
     -v foo=1 -v bar=2 ...'.

          CAUTION: Using '-v' to set the values of the built-in
          variables may lead to surprising results.  'awk' will reset
          the values of those variables as it needs to, possibly
          ignoring any initial value you may have given.

'-W GAWK-OPT'
     Provide an implementation-specific option.  This is the POSIX
     convention for providing implementation-specific options.  These
     options also have corresponding GNU-style long options.  Note that
     the long options may be abbreviated, as long as the abbreviations
     remain unique.  The full list of 'gawk'-specific options is
     provided next.

'--'
     Signal the end of the command-line options.  The following
     arguments are not treated as options even if they begin with '-'.
     This interpretation of '--' follows the POSIX argument parsing
     conventions.

     This is useful if you have file names that start with '-', or in
     shell scripts, if you have file names that will be specified by the
     user that could start with '-'.  It is also useful for passing
     options on to the 'awk' program; see *note Getopt Function::.

   The following list describes 'gawk'-specific options:

'-b'
'--characters-as-bytes'
     Cause 'gawk' to treat all input data as single-byte characters.  In
     addition, all output written with 'print' or 'printf' is treated as
     single-byte characters.

     Normally, 'gawk' follows the POSIX standard and attempts to process
     its input data according to the current locale (*note Locales::).
     This can often involve converting multibyte characters into wide
     characters (internally), and can lead to problems or confusion if
     the input data does not contain valid multibyte characters.  This
     option is an easy way to tell 'gawk', "Hands off my data!"

'-c'
'--traditional'
     Specify "compatibility mode", in which the GNU extensions to the
     'awk' language are disabled, so that 'gawk' behaves just like BWK
     'awk'.  *Note POSIX/GNU::, which summarizes the extensions.  Also
     see *note Compatibility Mode::.

'-C'
'--copyright'
     Print the short version of the General Public License and then
     exit.

'-d'[FILE]
'--dump-variables'['='FILE]
     Print a sorted list of global variables, their types, and final
     values to FILE.  If no FILE is provided, print this list to a file
     named 'awkvars.out' in the current directory.  No space is allowed
     between the '-d' and FILE, if FILE is supplied.

     Having a list of all global variables is a good way to look for
     typographical errors in your programs.  You would also use this
     option if you have a large program with a lot of functions, and you
     want to be sure that your functions don't inadvertently use global
     variables that you meant to be local.  (This is a particularly easy
     mistake to make with simple variable names like 'i', 'j', etc.)

'-D'[FILE]
'--debug'['='FILE]
     Enable debugging of 'awk' programs (*note Debugging::).  By
     default, the debugger reads commands interactively from the
     keyboard (standard input).  The optional FILE argument allows you
     to specify a file with a list of commands for the debugger to
     execute noninteractively.  No space is allowed between the '-D' and
     FILE, if FILE is supplied.

'-e' PROGRAM-TEXT
'--source' PROGRAM-TEXT
     Provide program source code in the PROGRAM-TEXT.  This option
     allows you to mix source code in files with source code that you
     enter on the command line.  This is particularly useful when you
     have library functions that you want to use from your command-line
     programs (*note AWKPATH Variable::).

'-E' FILE
'--exec' FILE
     Similar to '-f', read 'awk' program text from FILE.  There are two
     differences from '-f':

        * This option terminates option processing; anything else on the
          command line is passed on directly to the 'awk' program.

        * Command-line variable assignments of the form 'VAR=VALUE' are
          disallowed.

     This option is particularly necessary for World Wide Web CGI
     applications that pass arguments through the URL; using this option
     prevents a malicious (or other) user from passing in options,
     assignments, or 'awk' source code (via '-e') to the CGI
     application.(1)  This option should be used with '#!' scripts
     (*note Executable Scripts::), like so:

          #! /usr/local/bin/gawk -E

          AWK PROGRAM HERE ...

'-g'
'--gen-pot'
     Analyze the source program and generate a GNU 'gettext' portable
     object template file on standard output for all string constants
     that have been marked for translation.  *Note
     Internationalization::, for information about this option.

'-h'
'--help'
     Print a "usage" message summarizing the short- and long-style
     options that 'gawk' accepts and then exit.

'-i' SOURCE-FILE
'--include' SOURCE-FILE
     Read an 'awk' source library from SOURCE-FILE.  This option is
     completely equivalent to using the '@include' directive inside your
     program.  It is very similar to the '-f' option, but there are two
     important differences.  First, when '-i' is used, the program
     source is not loaded if it has been previously loaded, whereas with
     '-f', 'gawk' always loads the file.  Second, because this option is
     intended to be used with code libraries, 'gawk' does not recognize
     such files as constituting main program input.  Thus, after
     processing an '-i' argument, 'gawk' still expects to find the main
     source code via the '-f' option or on the command line.

'-l' EXT
'--load' EXT
     Load a dynamic extension named EXT.  Extensions are stored as
     system shared libraries.  This option searches for the library
     using the 'AWKLIBPATH' environment variable.  The correct library
     suffix for your platform will be supplied by default, so it need
     not be specified in the extension name.  The extension
     initialization routine should be named 'dl_load()'.  An alternative
     is to use the '@load' keyword inside the program to load a shared
     library.  This advanced feature is described in detail in *note
     Dynamic Extensions::.

'-L'[VALUE]
'--lint'['='VALUE]
     Warn about constructs that are dubious or nonportable to other
     'awk' implementations.  No space is allowed between the '-L' and
     VALUE, if VALUE is supplied.  Some warnings are issued when 'gawk'
     first reads your program.  Others are issued at runtime, as your
     program executes.  With an optional argument of 'fatal', lint
     warnings become fatal errors.  This may be drastic, but its use
     will certainly encourage the development of cleaner 'awk' programs.
     With an optional argument of 'invalid', only warnings about things
     that are actually invalid are issued.  (This is not fully
     implemented yet.)

     Some warnings are only printed once, even if the dubious constructs
     they warn about occur multiple times in your 'awk' program.  Thus,
     when eliminating problems pointed out by '--lint', you should take
     care to search for all occurrences of each inappropriate construct.
     As 'awk' programs are usually short, doing so is not burdensome.

'-M'
'--bignum'
     Select arbitrary-precision arithmetic on numbers.  This option has
     no effect if 'gawk' is not compiled to use the GNU MPFR and MP
     libraries (*note Arbitrary Precision Arithmetic::).

'-n'
'--non-decimal-data'
     Enable automatic interpretation of octal and hexadecimal values in
     input data (*note Nondecimal Data::).

          CAUTION: This option can severely break old programs.  Use
          with care.  Also note that this option may disappear in a
          future version of 'gawk'.

'-N'
'--use-lc-numeric'
     Force the use of the locale's decimal point character when parsing
     numeric input data (*note Locales::).

'-o'[FILE]
'--pretty-print'['='FILE]
     Enable pretty-printing of 'awk' programs.  By default, the output
     program is created in a file named 'awkprof.out' (*note
     Profiling::).  The optional FILE argument allows you to specify a
     different file name for the output.  No space is allowed between
     the '-o' and FILE, if FILE is supplied.

          NOTE: Due to the way 'gawk' has evolved, with this option your
          program still executes.  This will change in the next major
          release, such that 'gawk' will only pretty-print the program
          and not run it.

'-O'
'--optimize'
     Enable some optimizations on the internal representation of the
     program.  At the moment, this includes just simple constant
     folding.

'-p'[FILE]
'--profile'['='FILE]
     Enable profiling of 'awk' programs (*note Profiling::).  By
     default, profiles are created in a file named 'awkprof.out'.  The
     optional FILE argument allows you to specify a different file name
     for the profile file.  No space is allowed between the '-p' and
     FILE, if FILE is supplied.

     The profile contains execution counts for each statement in the
     program in the left margin, and function call counts for each
     function.

'-P'
'--posix'
     Operate in strict POSIX mode.  This disables all 'gawk' extensions
     (just like '--traditional') and disables all extensions not allowed
     by POSIX. *Note Common Extensions:: for a summary of the extensions
     in 'gawk' that are disabled by this option.  Also, the following
     additional restrictions apply:

        * Newlines do not act as whitespace to separate fields when 'FS'
          is equal to a single space (*note Fields::).

        * Newlines are not allowed after '?' or ':' (*note Conditional
          Exp::).

        * Specifying '-Ft' on the command line does not set the value of
          'FS' to be a single TAB character (*note Field Separators::).

        * The locale's decimal point character is used for parsing input
          data (*note Locales::).

     If you supply both '--traditional' and '--posix' on the command
     line, '--posix' takes precedence.  'gawk' issues a warning if both
     options are supplied.

'-r'
'--re-interval'
     Allow interval expressions (*note Regexp Operators::) in regexps.
     This is now 'gawk''s default behavior.  Nevertheless, this option
     remains (both for backward compatibility and for use in combination
     with '--traditional').

'-S'
'--sandbox'
     Disable the 'system()' function, input redirections with 'getline',
     output redirections with 'print' and 'printf', and dynamic
     extensions.  This is particularly useful when you want to run 'awk'
     scripts from questionable sources and need to make sure the scripts
     can't access your system (other than the specified input data
     file).

'-t'
'--lint-old'
     Warn about constructs that are not available in the original
     version of 'awk' from Version 7 Unix (*note V7/SVR3.1::).

'-V'
'--version'
     Print version information for this particular copy of 'gawk'.  This
     allows you to determine if your copy of 'gawk' is up to date with
     respect to whatever the Free Software Foundation is currently
     distributing.  It is also useful for bug reports (*note Bugs::).

   As long as program text has been supplied, any other options are
flagged as invalid with a warning message but are otherwise ignored.

   In compatibility mode, as a special case, if the value of FS supplied
to the '-F' option is 't', then 'FS' is set to the TAB character
('"\t"').  This is true only for '--traditional' and not for '--posix'
(*note Field Separators::).

   The '-f' option may be used more than once on the command line.  If
it is, 'awk' reads its program source from all of the named files, as if
they had been concatenated together into one big file.  This is useful
for creating libraries of 'awk' functions.  These functions can be
written once and then retrieved from a standard place, instead of having
to be included in each individual program.  The '-i' option is similar
in this regard.  (As mentioned in *note Definition Syntax::, function
names must be unique.)

   With standard 'awk', library functions can still be used, even if the
program is entered at the keyboard, by specifying '-f /dev/tty'.  After
typing your program, type 'Ctrl-d' (the end-of-file character) to
terminate it.  (You may also use '-f -' to read program source from the
standard input, but then you will not be able to also use the standard
input as a source of data.)

   Because it is clumsy using the standard 'awk' mechanisms to mix
source file and command-line 'awk' programs, 'gawk' provides the '-e'
option.  This does not require you to preempt the standard input for
your source code; it allows you to easily mix command-line and library
source code (*note AWKPATH Variable::).  As with '-f', the '-e' and '-i'
options may also be used multiple times on the command line.

   If no '-f' or '-e' option is specified, then 'gawk' uses the first
nonoption command-line argument as the text of the program source code.

   If the environment variable 'POSIXLY_CORRECT' exists, then 'gawk'
behaves in strict POSIX mode, exactly as if you had supplied '--posix'.
Many GNU programs look for this environment variable to suppress
extensions that conflict with POSIX, but 'gawk' behaves differently: it
suppresses all extensions, even those that do not conflict with POSIX,
and behaves in strict POSIX mode.  If '--lint' is supplied on the
command line and 'gawk' turns on POSIX mode because of
'POSIXLY_CORRECT', then it issues a warning message indicating that
POSIX mode is in effect.  You would typically set this variable in your
shell's startup file.  For a Bourne-compatible shell (such as Bash), you
would add these lines to the '.profile' file in your home directory:

     POSIXLY_CORRECT=true
     export POSIXLY_CORRECT

   For a C shell-compatible shell,(2) you would add this line to the
'.login' file in your home directory:

     setenv POSIXLY_CORRECT true

   Having 'POSIXLY_CORRECT' set is not recommended for daily use, but it
is good for testing the portability of your programs to other
environments.

   ---------- Footnotes ----------

   (1) For more detail, please see Section 4.4 of RFC 3875
(http://www.ietf.org/rfc/rfc3875).  Also see the explanatory note sent
to the 'gawk' bug mailing list
(http://lists.gnu.org/archive/html/bug-gawk/2014-11/msg00022.html).

   (2) Not recommended.


File: gawk.info,  Node: Other Arguments,  Next: Naming Standard Input,  Prev: Options,  Up: Invoking Gawk

2.3 Other Command-Line Arguments
================================

Any additional arguments on the command line are normally treated as
input files to be processed in the order specified.  However, an
argument that has the form 'VAR=VALUE', assigns the value VALUE to the
variable VAR--it does not specify a file at all.  (See *note Assignment
Options::.)  In the following example, COUNT=1 is a variable assignment,
not a file name:

     awk -f program.awk file1 count=1 file2

   All the command-line arguments are made available to your 'awk'
program in the 'ARGV' array (*note Built-in Variables::).  Command-line
options and the program text (if present) are omitted from 'ARGV'.  All
other arguments, including variable assignments, are included.  As each
element of 'ARGV' is processed, 'gawk' sets 'ARGIND' to the index in
'ARGV' of the current element.

   Changing 'ARGC' and 'ARGV' in your 'awk' program lets you control how
'awk' processes the input files; this is described in more detail in
*note ARGC and ARGV::.

   The distinction between file name arguments and variable-assignment
arguments is made when 'awk' is about to open the next input file.  At
that point in execution, it checks the file name to see whether it is
really a variable assignment; if so, 'awk' sets the variable instead of
reading a file.

   Therefore, the variables actually receive the given values after all
previously specified files have been read.  In particular, the values of
variables assigned in this fashion are _not_ available inside a 'BEGIN'
rule (*note BEGIN/END::), because such rules are run before 'awk' begins
scanning the argument list.

   The variable values given on the command line are processed for
escape sequences (*note Escape Sequences::).  (d.c.)

   In some very early implementations of 'awk', when a variable
assignment occurred before any file names, the assignment would happen
_before_ the 'BEGIN' rule was executed.  'awk''s behavior was thus
inconsistent; some command-line assignments were available inside the
'BEGIN' rule, while others were not.  Unfortunately, some applications
came to depend upon this "feature."  When 'awk' was changed to be more
consistent, the '-v' option was added to accommodate applications that
depended upon the old behavior.

   The variable assignment feature is most useful for assigning to
variables such as 'RS', 'OFS', and 'ORS', which control input and output
formats, before scanning the data files.  It is also useful for
controlling state if multiple passes are needed over a data file.  For
example:

     awk 'pass == 1  { PASS 1 STUFF }
          pass == 2  { PASS 2 STUFF }' pass=1 mydata pass=2 mydata

   Given the variable assignment feature, the '-F' option for setting
the value of 'FS' is not strictly necessary.  It remains for historical
compatibility.


File: gawk.info,  Node: Naming Standard Input,  Next: Environment Variables,  Prev: Other Arguments,  Up: Invoking Gawk

2.4 Naming Standard Input
=========================

Often, you may wish to read standard input together with other files.
For example, you may wish to read one file, read standard input coming
from a pipe, and then read another file.

   The way to name the standard input, with all versions of 'awk', is to
use a single, standalone minus sign or dash, '-'.  For example:

     SOME_COMMAND | awk -f myprog.awk file1 - file2

Here, 'awk' first reads 'file1', then it reads the output of
SOME_COMMAND, and finally it reads 'file2'.

   You may also use '"-"' to name standard input when reading files with
'getline' (*note Getline/File::).

   In addition, 'gawk' allows you to specify the special file name
'/dev/stdin', both on the command line and with 'getline'.  Some other
versions of 'awk' also support this, but it is not standard.  (Some
operating systems provide a '/dev/stdin' file in the filesystem;
however, 'gawk' always processes this file name itself.)


File: gawk.info,  Node: Environment Variables,  Next: Exit Status,  Prev: Naming Standard Input,  Up: Invoking Gawk

2.5 The Environment Variables 'gawk' Uses
=========================================

A number of environment variables influence how 'gawk' behaves.

* Menu:

* AWKPATH Variable::            Searching directories for 'awk'
                                programs.
* AWKLIBPATH Variable::         Searching directories for 'awk' shared
                                libraries.
* Other Environment Variables:: The environment variables.


File: gawk.info,  Node: AWKPATH Variable,  Next: AWKLIBPATH Variable,  Up: Environment Variables

2.5.1 The 'AWKPATH' Environment Variable
----------------------------------------

The previous minor node described how 'awk' program files can be named
on the command line with the '-f' option.  In most 'awk'
implementations, you must supply a precise pathname for each program
file, unless the file is in the current directory.  But with 'gawk', if
the file name supplied to the '-f' or '-i' options does not contain a
directory separator '/', then 'gawk' searches a list of directories
(called the "search path") one by one, looking for a file with the
specified name.

   The search path is a string consisting of directory names separated
by colons.(1)  'gawk' gets its search path from the 'AWKPATH'
environment variable.  If that variable does not exist, or if it has an
empty value, 'gawk' uses a default path (described shortly).

   The search path feature is particularly helpful for building
libraries of useful 'awk' functions.  The library files can be placed in
a standard directory in the default path and then specified on the
command line with a short file name.  Otherwise, you would have to type
the full file name for each file.

   By using the '-i' or '-f' options, your command-line 'awk' programs
can use facilities in 'awk' library files (*note Library Functions::).
Path searching is not done if 'gawk' is in compatibility mode.  This is
true for both '--traditional' and '--posix'.  *Note Options::.

   If the source code file is not found after the initial search, the
path is searched again after adding the suffix '.awk' to the file name.

   'gawk''s path search mechanism is similar to the shell's.  (See 'The
Bourne-Again SHell manual' (http://www.gnu.org/software/bash/manual/).)
It treats a null entry in the path as indicating the current directory.
(A null entry is indicated by starting or ending the path with a colon
or by placing two colons next to each other ['::'].)

     NOTE: To include the current directory in the path, either place
     '.' as an entry in the path or write a null entry in the path.

     Different past versions of 'gawk' would also look explicitly in the
     current directory, either before or after the path search.  As of
     version 4.1.2, this no longer happens; if you wish to look in the
     current directory, you must include '.' either as a separate entry
     or as a null entry in the search path.

   The default value for 'AWKPATH' is '.:/usr/local/share/awk'.(2)
Since '.' is included at the beginning, 'gawk' searches first in the
current directory and then in '/usr/local/share/awk'.  In practice, this
means that you will rarely need to change the value of 'AWKPATH'.

   'gawk' places the value of the search path that it used into
'ENVIRON["AWKPATH"]'.  This provides access to the actual search path
value from within an 'awk' program.

   Although you can change 'ENVIRON["AWKPATH"]' within your 'awk'
program, this has no effect on the running program's behavior.  This
makes sense: the 'AWKPATH' environment variable is used to find the
program source files.  Once your program is running, all the files have
been found, and 'gawk' no longer needs to use 'AWKPATH'.

   ---------- Footnotes ----------

   (1) Semicolons on MS-Windows and MS-DOS.

   (2) Your version of 'gawk' may use a different directory; it will
depend upon how 'gawk' was built and installed.  The actual directory is
the value of '$(datadir)' generated when 'gawk' was configured.  You
probably don't need to worry about this, though.


File: gawk.info,  Node: AWKLIBPATH Variable,  Next: Other Environment Variables,  Prev: AWKPATH Variable,  Up: Environment Variables

2.5.2 The 'AWKLIBPATH' Environment Variable
-------------------------------------------

The 'AWKLIBPATH' environment variable is similar to the 'AWKPATH'
variable, but it is used to search for loadable extensions (stored as
system shared libraries) specified with the '-l' option rather than for
source files.  If the extension is not found, the path is searched again
after adding the appropriate shared library suffix for the platform.
For example, on GNU/Linux systems, the suffix '.so' is used.  The search
path specified is also used for extensions loaded via the '@load'
keyword (*note Loading Shared Libraries::).

   If 'AWKLIBPATH' does not exist in the environment, or if it has an
empty value, 'gawk' uses a default path; this is typically
'/usr/local/lib/gawk', although it can vary depending upon how 'gawk'
was built.

   'gawk' places the value of the search path that it used into
'ENVIRON["AWKLIBPATH"]'.  This provides access to the actual search path
value from within an 'awk' program.


File: gawk.info,  Node: Other Environment Variables,  Prev: AWKLIBPATH Variable,  Up: Environment Variables

2.5.3 Other Environment Variables
---------------------------------

A number of other environment variables affect 'gawk''s behavior, but
they are more specialized.  Those in the following list are meant to be
used by regular users:

'GAWK_MSEC_SLEEP'
     Specifies the interval between connection retries, in milliseconds.
     On systems that do not support the 'usleep()' system call, the
     value is rounded up to an integral number of seconds.

'GAWK_READ_TIMEOUT'
     Specifies the time, in milliseconds, for 'gawk' to wait for input
     before returning with an error.  *Note Read Timeout::.

'GAWK_SOCK_RETRIES'
     Controls the number of times 'gawk' attempts to retry a two-way
     TCP/IP (socket) connection before giving up.  *Note TCP/IP
     Networking::.

'POSIXLY_CORRECT'
     Causes 'gawk' to switch to POSIX-compatibility mode, disabling all
     traditional and GNU extensions.  *Note Options::.

   The environment variables in the following list are meant for use by
the 'gawk' developers for testing and tuning.  They are subject to
change.  The variables are:

'AWKBUFSIZE'
     This variable only affects 'gawk' on POSIX-compliant systems.  With
     a value of 'exact', 'gawk' uses the size of each input file as the
     size of the memory buffer to allocate for I/O. Otherwise, the value
     should be a number, and 'gawk' uses that number as the size of the
     buffer to allocate.  (When this variable is not set, 'gawk' uses
     the smaller of the file's size and the "default" blocksize, which
     is usually the filesystem's I/O blocksize.)

'AWK_HASH'
     If this variable exists with a value of 'gst', 'gawk' switches to
     using the hash function from GNU Smalltalk for managing arrays.
     This function may be marginally faster than the standard function.

'AWKREADFUNC'
     If this variable exists, 'gawk' switches to reading source files
     one line at a time, instead of reading in blocks.  This exists for
     debugging problems on filesystems on non-POSIX operating systems
     where I/O is performed in records, not in blocks.

'GAWK_MSG_SRC'
     If this variable exists, 'gawk' includes the file name and line
     number within the 'gawk' source code from which warning and/or
     fatal messages are generated.  Its purpose is to help isolate the
     source of a message, as there are multiple places that produce the
     same warning or error message.

'GAWK_LOCALE_DIR'
     Specifies the location of compiled message object files for 'gawk'
     itself.  This is passed to the 'bindtextdomain()' function when
     'gawk' starts up.

'GAWK_NO_DFA'
     If this variable exists, 'gawk' does not use the DFA regexp matcher
     for "does it match" kinds of tests.  This can cause 'gawk' to be
     slower.  Its purpose is to help isolate differences between the two
     regexp matchers that 'gawk' uses internally.  (There aren't
     supposed to be differences, but occasionally theory and practice
     don't coordinate with each other.)

'GAWK_NO_PP_RUN'
     When 'gawk' is invoked with the '--pretty-print' option, it will
     not run the program if this environment variable exists.

          CAUTION: This variable will not survive into the next major
          release.

'GAWK_STACKSIZE'
     This specifies the amount by which 'gawk' should grow its internal
     evaluation stack, when needed.

'INT_CHAIN_MAX'
     This specifies intended maximum number of items 'gawk' will
     maintain on a hash chain for managing arrays indexed by integers.

'STR_CHAIN_MAX'
     This specifies intended maximum number of items 'gawk' will
     maintain on a hash chain for managing arrays indexed by strings.

'TIDYMEM'
     If this variable exists, 'gawk' uses the 'mtrace()' library calls
     from the GNU C library to help track down possible memory leaks.


File: gawk.info,  Node: Exit Status,  Next: Include Files,  Prev: Environment Variables,  Up: Invoking Gawk

2.6 'gawk''s Exit Status
========================

If the 'exit' statement is used with a value (*note Exit Statement::),
then 'gawk' exits with the numeric value given to it.

   Otherwise, if there were no problems during execution, 'gawk' exits
with the value of the C constant 'EXIT_SUCCESS'.  This is usually zero.

   If an error occurs, 'gawk' exits with the value of the C constant
'EXIT_FAILURE'.  This is usually one.

   If 'gawk' exits because of a fatal error, the exit status is two.  On
non-POSIX systems, this value may be mapped to 'EXIT_FAILURE'.


File: gawk.info,  Node: Include Files,  Next: Loading Shared Libraries,  Prev: Exit Status,  Up: Invoking Gawk

2.7 Including Other Files into Your Program
===========================================

This minor node describes a feature that is specific to 'gawk'.

   The '@include' keyword can be used to read external 'awk' source
files.  This gives you the ability to split large 'awk' source files
into smaller, more manageable pieces, and also lets you reuse common
'awk' code from various 'awk' scripts.  In other words, you can group
together 'awk' functions used to carry out specific tasks into external
files.  These files can be used just like function libraries, using the
'@include' keyword in conjunction with the 'AWKPATH' environment
variable.  Note that source files may also be included using the '-i'
option.

   Let's see an example.  We'll start with two (trivial) 'awk' scripts,
namely 'test1' and 'test2'.  Here is the 'test1' script:

     BEGIN {
         print "This is script test1."
     }

and here is 'test2':

     @include "test1"
     BEGIN {
         print "This is script test2."
     }

   Running 'gawk' with 'test2' produces the following result:

     $ gawk -f test2
     -| This is script test1.
     -| This is script test2.

   'gawk' runs the 'test2' script, which includes 'test1' using the
'@include' keyword.  So, to include external 'awk' source files, you
just use '@include' followed by the name of the file to be included,
enclosed in double quotes.

     NOTE: Keep in mind that this is a language construct and the file
     name cannot be a string variable, but rather just a literal string
     constant in double quotes.

   The files to be included may be nested; e.g., given a third script,
namely 'test3':

     @include "test2"
     BEGIN {
         print "This is script test3."
     }

Running 'gawk' with the 'test3' script produces the following results:

     $ gawk -f test3
     -| This is script test1.
     -| This is script test2.
     -| This is script test3.

   The file name can, of course, be a pathname.  For example:

     @include "../io_funcs"

and:

     @include "/usr/awklib/network"

are both valid.  The 'AWKPATH' environment variable can be of great
value when using '@include'.  The same rules for the use of the
'AWKPATH' variable in command-line file searches (*note AWKPATH
Variable::) apply to '@include' also.

   This is very helpful in constructing 'gawk' function libraries.  If
you have a large script with useful, general-purpose 'awk' functions,
you can break it down into library files and put those files in a
special directory.  You can then include those "libraries," either by
using the full pathnames of the files, or by setting the 'AWKPATH'
environment variable accordingly and then using '@include' with just the
file part of the full pathname.  Of course, you can keep library files
in more than one directory; the more complex the working environment is,
the more directories you may need to organize the files to be included.

   Given the ability to specify multiple '-f' options, the '@include'
mechanism is not strictly necessary.  However, the '@include' keyword
can help you in constructing self-contained 'gawk' programs, thus
reducing the need for writing complex and tedious command lines.  In
particular, '@include' is very useful for writing CGI scripts to be run
from web pages.

   As mentioned in *note AWKPATH Variable::, the current directory is
always searched first for source files, before searching in 'AWKPATH';
this also applies to files named with '@include'.


File: gawk.info,  Node: Loading Shared Libraries,  Next: Obsolete,  Prev: Include Files,  Up: Invoking Gawk

2.8 Loading Dynamic Extensions into Your Program
================================================

This minor node describes a feature that is specific to 'gawk'.

   The '@load' keyword can be used to read external 'awk' extensions
(stored as system shared libraries).  This allows you to link in
compiled code that may offer superior performance and/or give you access
to extended capabilities not supported by the 'awk' language.  The
'AWKLIBPATH' variable is used to search for the extension.  Using
'@load' is completely equivalent to using the '-l' command-line option.

   If the extension is not initially found in 'AWKLIBPATH', another
search is conducted after appending the platform's default shared
library suffix to the file name.  For example, on GNU/Linux systems, the
suffix '.so' is used:

     $ gawk '@load "ordchr"; BEGIN {print chr(65)}'
     -| A

This is equivalent to the following example:

     $ gawk -lordchr 'BEGIN {print chr(65)}'
     -| A

For command-line usage, the '-l' option is more convenient, but '@load'
is useful for embedding inside an 'awk' source file that requires access
to an extension.

   *note Dynamic Extensions::, describes how to write extensions (in C
or C++) that can be loaded with either '@load' or the '-l' option.  It
also describes the 'ordchr' extension.


File: gawk.info,  Node: Obsolete,  Next: Undocumented,  Prev: Loading Shared Libraries,  Up: Invoking Gawk

2.9 Obsolete Options and/or Features
====================================

This minor node describes features and/or command-line options from
previous releases of 'gawk' that either are not available in the current
version or are still supported but deprecated (meaning that they will
_not_ be in the next release).

   The process-related special files '/dev/pid', '/dev/ppid',
'/dev/pgrpid', and '/dev/user' were deprecated in 'gawk' 3.1, but still
worked.  As of version 4.0, they are no longer interpreted specially by
'gawk'.  (Use 'PROCINFO' instead; see *note Auto-set::.)


File: gawk.info,  Node: Undocumented,  Next: Invoking Summary,  Prev: Obsolete,  Up: Invoking Gawk

2.10 Undocumented Options and Features
======================================

     Use the Source, Luke!
                             -- _Obi-Wan_

   This minor node intentionally left blank.


File: gawk.info,  Node: Invoking Summary,  Prev: Undocumented,  Up: Invoking Gawk

2.11 Summary
============

   * Use either 'awk 'PROGRAM' FILES' or 'awk -f PROGRAM-FILE FILES' to
     run 'awk'.

   * The three standard options for all versions of 'awk' are '-f',
     '-F', and '-v'.  'gawk' supplies these and many others, as well as
     corresponding GNU-style long options.

   * Nonoption command-line arguments are usually treated as file names,
     unless they have the form 'VAR=VALUE', in which case they are taken
     as variable assignments to be performed at that point in processing
     the input.

   * All nonoption command-line arguments, excluding the program text,
     are placed in the 'ARGV' array.  Adjusting 'ARGC' and 'ARGV'
     affects how 'awk' processes input.

   * You can use a single minus sign ('-') to refer to standard input on
     the command line.  'gawk' also lets you use the special file name
     '/dev/stdin'.

   * 'gawk' pays attention to a number of environment variables.
     'AWKPATH', 'AWKLIBPATH', and 'POSIXLY_CORRECT' are the most
     important ones.

   * 'gawk''s exit status conveys information to the program that
     invoked it.  Use the 'exit' statement from within an 'awk' program
     to set the exit status.

   * 'gawk' allows you to include other 'awk' source files into your
     program using the '@include' statement and/or the '-i' and '-f'
     command-line options.

   * 'gawk' allows you to load additional functions written in C or C++
     using the '@load' statement and/or the '-l' option.  (This advanced
     feature is described later, in *note Dynamic Extensions::.)


File: gawk.info,  Node: Regexp,  Next: Reading Files,  Prev: Invoking Gawk,  Up: Top

3 Regular Expressions
*********************

A "regular expression", or "regexp", is a way of describing a set of
strings.  Because regular expressions are such a fundamental part of
'awk' programming, their format and use deserve a separate major node.

   A regular expression enclosed in slashes ('/') is an 'awk' pattern
that matches every input record whose text belongs to that set.  The
simplest regular expression is a sequence of letters, numbers, or both.
Such a regexp matches any string that contains that sequence.  Thus, the
regexp 'foo' matches any string containing 'foo'.  Thus, the pattern
'/foo/' matches any input record containing the three adjacent
characters 'foo' _anywhere_ in the record.  Other kinds of regexps let
you specify more complicated classes of strings.

* Menu:

* Regexp Usage::                How to Use Regular Expressions.
* Escape Sequences::            How to write nonprinting characters.
* Regexp Operators::            Regular Expression Operators.
* Bracket Expressions::         What can go between '[...]'.
* Leftmost Longest::            How much text matches.
* Computed Regexps::            Using Dynamic Regexps.
* GNU Regexp Operators::        Operators specific to GNU software.
* Case-sensitivity::            How to do case-insensitive matching.
* Regexp Summary::              Regular expressions summary.


File: gawk.info,  Node: Regexp Usage,  Next: Escape Sequences,  Up: Regexp

3.1 How to Use Regular Expressions
==================================

A regular expression can be used as a pattern by enclosing it in
slashes.  Then the regular expression is tested against the entire text
of each record.  (Normally, it only needs to match some part of the text
in order to succeed.)  For example, the following prints the second
field of each record where the string 'li' appears anywhere in the
record:

     $ awk '/li/ { print $2 }' mail-list
     -| 555-5553
     -| 555-0542
     -| 555-6699
     -| 555-3430

   Regular expressions can also be used in matching expressions.  These
expressions allow you to specify the string to match against; it need
not be the entire current input record.  The two operators '~' and '!~'
perform regular expression comparisons.  Expressions using these
operators can be used as patterns, or in 'if', 'while', 'for', and 'do'
statements.  (*Note Statements::.)  For example, the following is true
if the expression EXP (taken as a string) matches REGEXP:

     EXP ~ /REGEXP/

This example matches, or selects, all input records with the uppercase
letter 'J' somewhere in the first field:

     $ awk '$1 ~ /J/' inventory-shipped
     -| Jan  13  25  15 115
     -| Jun  31  42  75 492
     -| Jul  24  34  67 436
     -| Jan  21  36  64 620

   So does this:

     awk '{ if ($1 ~ /J/) print }' inventory-shipped

   This next example is true if the expression EXP (taken as a character
string) does _not_ match REGEXP:

     EXP !~ /REGEXP/

   The following example matches, or selects, all input records whose
first field _does not_ contain the uppercase letter 'J':

     $ awk '$1 !~ /J/' inventory-shipped
     -| Feb  15  32  24 226
     -| Mar  15  24  34 228
     -| Apr  31  52  63 420
     -| May  16  34  29 208
     ...

   When a regexp is enclosed in slashes, such as '/foo/', we call it a
"regexp constant", much like '5.27' is a numeric constant and '"foo"' is
a string constant.


File: gawk.info,  Node: Escape Sequences,  Next: Regexp Operators,  Prev: Regexp Usage,  Up: Regexp

3.2 Escape Sequences
====================

Some characters cannot be included literally in string constants
('"foo"') or regexp constants ('/foo/').  Instead, they should be
represented with "escape sequences", which are character sequences
beginning with a backslash ('\').  One use of an escape sequence is to
include a double-quote character in a string constant.  Because a plain
double quote ends the string, you must use '\"' to represent an actual
double-quote character as a part of the string.  For example:

     $ awk 'BEGIN { print "He said \"hi!\" to her." }'
     -| He said "hi!" to her.

   The backslash character itself is another character that cannot be
included normally; you must write '\\' to put one backslash in the
string or regexp.  Thus, the string whose contents are the two
characters '"' and '\' must be written '"\"\\"'.

   Other escape sequences represent unprintable characters such as TAB
or newline.  There is nothing to stop you from entering most unprintable
characters directly in a string constant or regexp constant, but they
may look ugly.

   The following list presents all the escape sequences used in 'awk'
and what they represent.  Unless noted otherwise, all these escape
sequences apply to both string constants and regexp constants:

'\\'
     A literal backslash, '\'.

'\a'
     The "alert" character, 'Ctrl-g', ASCII code 7 (BEL). (This often
     makes some sort of audible noise.)

'\b'
     Backspace, 'Ctrl-h', ASCII code 8 (BS).

'\f'
     Formfeed, 'Ctrl-l', ASCII code 12 (FF).

'\n'
     Newline, 'Ctrl-j', ASCII code 10 (LF).

'\r'
     Carriage return, 'Ctrl-m', ASCII code 13 (CR).

'\t'
     Horizontal TAB, 'Ctrl-i', ASCII code 9 (HT).

'\v'
     Vertical TAB, 'Ctrl-k', ASCII code 11 (VT).

'\NNN'
     The octal value NNN, where NNN stands for 1 to 3 digits between '0'
     and '7'.  For example, the code for the ASCII ESC (escape)
     character is '\033'.

'\xHH...'
     The hexadecimal value HH, where HH stands for a sequence of
     hexadecimal digits ('0'-'9', and either 'A'-'F' or 'a'-'f').  Like
     the same construct in ISO C, the escape sequence continues until
     the first nonhexadecimal digit is seen.  (c.e.)  However, using
     more than two hexadecimal digits produces undefined results.  (The
     '\x' escape sequence is not allowed in POSIX 'awk'.)

          CAUTION: The next major release of 'gawk' will change, such
          that a maximum of two hexadecimal digits following the '\x'
          will be used.

'\/'
     A literal slash (necessary for regexp constants only).  This
     sequence is used when you want to write a regexp constant that
     contains a slash (such as '/.*:\/home\/[[:alnum:]]+:.*/'; the
     '[[:alnum:]]' notation is discussed in *note Bracket
     Expressions::).  Because the regexp is delimited by slashes, you
     need to escape any slash that is part of the pattern, in order to
     tell 'awk' to keep processing the rest of the regexp.

'\"'
     A literal double quote (necessary for string constants only).  This
     sequence is used when you want to write a string constant that
     contains a double quote (such as '"He said \"hi!\" to her."').
     Because the string is delimited by double quotes, you need to
     escape any quote that is part of the string, in order to tell 'awk'
     to keep processing the rest of the string.

   In 'gawk', a number of additional two-character sequences that begin
with a backslash have special meaning in regexps.  *Note GNU Regexp
Operators::.

   In a regexp, a backslash before any character that is not in the
previous list and not listed in *note GNU Regexp Operators:: means that
the next character should be taken literally, even if it would normally
be a regexp operator.  For example, '/a\+b/' matches the three
characters 'a+b'.

   For complete portability, do not use a backslash before any character
not shown in the previous list or that is not an operator.

                  Backslash Before Regular Characters

   If you place a backslash in a string constant before something that
is not one of the characters previously listed, POSIX 'awk' purposely
leaves what happens as undefined.  There are two choices:

Strip the backslash out
     This is what BWK 'awk' and 'gawk' both do.  For example, '"a\qc"'
     is the same as '"aqc"'.  (Because this is such an easy bug both to
     introduce and to miss, 'gawk' warns you about it.)  Consider 'FS =
     "[ \t]+\|[ \t]+"' to use vertical bars surrounded by whitespace as
     the field separator.  There should be two backslashes in the
     string: 'FS = "[ \t]+\\|[ \t]+"'.)

Leave the backslash alone
     Some other 'awk' implementations do this.  In such implementations,
     typing '"a\qc"' is the same as typing '"a\\qc"'.

   To summarize:

   * The escape sequences in the preceding list are always processed
     first, for both string constants and regexp constants.  This
     happens very early, as soon as 'awk' reads your program.

   * 'gawk' processes both regexp constants and dynamic regexps (*note
     Computed Regexps::), for the special operators listed in *note GNU
     Regexp Operators::.

   * A backslash before any other character means to treat that
     character literally.

                  Escape Sequences for Metacharacters

   Suppose you use an octal or hexadecimal escape to represent a regexp
metacharacter.  (See *note Regexp Operators::.)  Does 'awk' treat the
character as a literal character or as a regexp operator?

   Historically, such characters were taken literally.  (d.c.)  However,
the POSIX standard indicates that they should be treated as real
metacharacters, which is what 'gawk' does.  In compatibility mode (*note
Options::), 'gawk' treats the characters represented by octal and
hexadecimal escape sequences literally when used in regexp constants.
Thus, '/a\52b/' is equivalent to '/a\*b/'.


File: gawk.info,  Node: Regexp Operators,  Next: Bracket Expressions,  Prev: Escape Sequences,  Up: Regexp

3.3 Regular Expression Operators
================================

You can combine regular expressions with special characters, called
"regular expression operators" or "metacharacters", to increase the
power and versatility of regular expressions.

   The escape sequences described in *note Escape Sequences:: are valid
inside a regexp.  They are introduced by a '\' and are recognized and
converted into corresponding real characters as the very first step in
processing regexps.

   Here is a list of metacharacters.  All characters that are not escape
sequences and that are not listed here stand for themselves:

'\'
     This suppresses the special meaning of a character when matching.
     For example, '\$' matches the character '$'.

'^'
     This matches the beginning of a string.  '^@chapter' matches
     '@chapter' at the beginning of a string, for example, and can be
     used to identify chapter beginnings in Texinfo source files.  The
     '^' is known as an "anchor", because it anchors the pattern to
     match only at the beginning of the string.

     It is important to realize that '^' does not match the beginning of
     a line (the point right after a '\n' newline character) embedded in
     a string.  The condition is not true in the following example:

          if ("line1\nLINE 2" ~ /^L/) ...

'$'
     This is similar to '^', but it matches only at the end of a string.
     For example, 'p$' matches a record that ends with a 'p'.  The '$'
     is an anchor and does not match the end of a line (the point right
     before a '\n' newline character) embedded in a string.  The
     condition in the following example is not true:

          if ("line1\nLINE 2" ~ /1$/) ...

'.' (period)
     This matches any single character, _including_ the newline
     character.  For example, '.P' matches any single character followed
     by a 'P' in a string.  Using concatenation, we can make a regular
     expression such as 'U.A', which matches any three-character
     sequence that begins with 'U' and ends with 'A'.

     In strict POSIX mode (*note Options::), '.' does not match the NUL
     character, which is a character with all bits equal to zero.
     Otherwise, NUL is just another character.  Other versions of 'awk'
     may not be able to match the NUL character.

'['...']'
     This is called a "bracket expression".(1)  It matches any _one_ of
     the characters that are enclosed in the square brackets.  For
     example, '[MVX]' matches any one of the characters 'M', 'V', or 'X'
     in a string.  A full discussion of what can be inside the square
     brackets of a bracket expression is given in *note Bracket
     Expressions::.

'[^'...']'
     This is a "complemented bracket expression".  The first character
     after the '[' _must_ be a '^'.  It matches any characters _except_
     those in the square brackets.  For example, '[^awk]' matches any
     character that is not an 'a', 'w', or 'k'.

'|'
     This is the "alternation operator" and it is used to specify
     alternatives.  The '|' has the lowest precedence of all the regular
     expression operators.  For example, '^P|[aeiouy]' matches any
     string that matches either '^P' or '[aeiouy]'.  This means it
     matches any string that starts with 'P' or contains (anywhere
     within it) a lowercase English vowel.

     The alternation applies to the largest possible regexps on either
     side.

'('...')'
     Parentheses are used for grouping in regular expressions, as in
     arithmetic.  They can be used to concatenate regular expressions
     containing the alternation operator, '|'.  For example,
     '@(samp|code)\{[^}]+\}' matches both '@code{foo}' and '@samp{bar}'.
     (These are Texinfo formatting control sequences.  The '+' is
     explained further on in this list.)

'*'
     This symbol means that the preceding regular expression should be
     repeated as many times as necessary to find a match.  For example,
     'ph*' applies the '*' symbol to the preceding 'h' and looks for
     matches of one 'p' followed by any number of 'h's.  This also
     matches just 'p' if no 'h's are present.

     There are two subtle points to understand about how '*' works.
     First, the '*' applies only to the single preceding regular
     expression component (e.g., in 'ph*', it applies just to the 'h').
     To cause '*' to apply to a larger subexpression, use parentheses:
     '(ph)*' matches 'ph', 'phph', 'phphph', and so on.

     Second, '*' finds as many repetitions as possible.  If the text to
     be matched is 'phhhhhhhhhhhhhhooey', 'ph*' matches all of the 'h's.

'+'
     This symbol is similar to '*', except that the preceding expression
     must be matched at least once.  This means that 'wh+y' would match
     'why' and 'whhy', but not 'wy', whereas 'wh*y' would match all
     three.

'?'
     This symbol is similar to '*', except that the preceding expression
     can be matched either once or not at all.  For example, 'fe?d'
     matches 'fed' and 'fd', but nothing else.

'{'N'}'
'{'N',}'
'{'N','M'}'
     One or two numbers inside braces denote an "interval expression".
     If there is one number in the braces, the preceding regexp is
     repeated N times.  If there are two numbers separated by a comma,
     the preceding regexp is repeated N to M times.  If there is one
     number followed by a comma, then the preceding regexp is repeated
     at least N times:

     'wh{3}y'
          Matches 'whhhy', but not 'why' or 'whhhhy'.

     'wh{3,5}y'
          Matches 'whhhy', 'whhhhy', or 'whhhhhy' only.

     'wh{2,}y'
          Matches 'whhy', 'whhhy', and so on.

     Interval expressions were not traditionally available in 'awk'.
     They were added as part of the POSIX standard to make 'awk' and
     'egrep' consistent with each other.

     Initially, because old programs may use '{' and '}' in regexp
     constants, 'gawk' did _not_ match interval expressions in regexps.

     However, beginning with version 4.0, 'gawk' does match interval
     expressions by default.  This is because compatibility with POSIX
     has become more important to most 'gawk' users than compatibility
     with old programs.

     For programs that use '{' and '}' in regexp constants, it is good
     practice to always escape them with a backslash.  Then the regexp
     constants are valid and work the way you want them to, using any
     version of 'awk'.(2)

     Finally, when '{' and '}' appear in regexp constants in a way that
     cannot be interpreted as an interval expression (such as '/q{a}/'),
     then they stand for themselves.

   In regular expressions, the '*', '+', and '?' operators, as well as
the braces '{' and '}', have the highest precedence, followed by
concatenation, and finally by '|'.  As in arithmetic, parentheses can
change how operators are grouped.

   In POSIX 'awk' and 'gawk', the '*', '+', and '?' operators stand for
themselves when there is nothing in the regexp that precedes them.  For
example, '/+/' matches a literal plus sign.  However, many other
versions of 'awk' treat such a usage as a syntax error.

   If 'gawk' is in compatibility mode (*note Options::), interval
expressions are not available in regular expressions.

   ---------- Footnotes ----------

   (1) In other literature, you may see a bracket expression referred to
as either a "character set", a "character class", or a "character list".

   (2) Use two backslashes if you're using a string constant with a
regexp operator or function.


File: gawk.info,  Node: Bracket Expressions,  Next: Leftmost Longest,  Prev: Regexp Operators,  Up: Regexp

3.4 Using Bracket Expressions
=============================

As mentioned earlier, a bracket expression matches any character among
those listed between the opening and closing square brackets.

   Within a bracket expression, a "range expression" consists of two
characters separated by a hyphen.  It matches any single character that
sorts between the two characters, based upon the system's native
character set.  For example, '[0-9]' is equivalent to '[0123456789]'.
(See *note Ranges and Locales:: for an explanation of how the POSIX
standard and 'gawk' have changed over time.  This is mainly of
historical interest.)

   With the increasing popularity of the Unicode character standard
(http://www.unicode.org), there is an additional wrinkle to consider.
Octal and hexadecimal escape sequences inside bracket expressions are
taken to represent only single-byte characters (characters whose values
fit within the range 0-256).  To match a range of characters where the
endpoints of the range are larger than 256, enter the multibyte
encodings of the characters directly.

   To include one of the characters '\', ']', '-', or '^' in a bracket
expression, put a '\' in front of it.  For example:

     [d\]]

matches either 'd' or ']'.  Additionally, if you place ']' right after
the opening '[', the closing bracket is treated as one of the characters
to be matched.

   The treatment of '\' in bracket expressions is compatible with other
'awk' implementations and is also mandated by POSIX. The regular
expressions in 'awk' are a superset of the POSIX specification for
Extended Regular Expressions (EREs).  POSIX EREs are based on the
regular expressions accepted by the traditional 'egrep' utility.

   "Character classes" are a feature introduced in the POSIX standard.
A character class is a special notation for describing lists of
characters that have a specific attribute, but the actual characters can
vary from country to country and/or from character set to character set.
For example, the notion of what is an alphabetic character differs
between the United States and France.

   A character class is only valid in a regexp _inside_ the brackets of
a bracket expression.  Character classes consist of '[:', a keyword
denoting the class, and ':]'.  *note Table 3.1: table-char-classes.
lists the character classes defined by the POSIX standard.

Class       Meaning
--------------------------------------------------------------------------
'[:alnum:]' Alphanumeric characters
'[:alpha:]' Alphabetic characters
'[:blank:]' Space and TAB characters
'[:cntrl:]' Control characters
'[:digit:]' Numeric characters
'[:graph:]' Characters that are both printable and visible (a space is
            printable but not visible, whereas an 'a' is both)
'[:lower:]' Lowercase alphabetic characters
'[:print:]' Printable characters (characters that are not control
            characters)
'[:punct:]' Punctuation characters (characters that are not letters,
            digits, control characters, or space characters)
'[:space:]' Space characters (such as space, TAB, and formfeed, to name
            a few)
'[:upper:]' Uppercase alphabetic characters
'[:xdigit:]'Characters that are hexadecimal digits

Table 3.1: POSIX character classes

   For example, before the POSIX standard, you had to write
'/[A-Za-z0-9]/' to match alphanumeric characters.  If your character set
had other alphabetic characters in it, this would not match them.  With
the POSIX character classes, you can write '/[[:alnum:]]/' to match the
alphabetic and numeric characters in your character set.

   Some utilities that match regular expressions provide a nonstandard
'[:ascii:]' character class; 'awk' does not.  However, you can simulate
such a construct using '[\x00-\x7F]'.  This matches all values
numerically between zero and 127, which is the defined range of the
ASCII character set.  Use a complemented character list ('[^\x00-\x7F]')
to match any single-byte characters that are not in the ASCII range.

   Two additional special sequences can appear in bracket expressions.
These apply to non-ASCII character sets, which can have single symbols
(called "collating elements") that are represented with more than one
character.  They can also have several characters that are equivalent
for "collating", or sorting, purposes.  (For example, in French, a plain
"e" and a grave-accented "e`" are equivalent.)  These sequences are:

Collating symbols
     Multicharacter collating elements enclosed between '[.' and '.]'.
     For example, if 'ch' is a collating element, then '[[.ch.]]' is a
     regexp that matches this collating element, whereas '[ch]' is a
     regexp that matches either 'c' or 'h'.

Equivalence classes
     Locale-specific names for a list of characters that are equal.  The
     name is enclosed between '[=' and '=]'.  For example, the name 'e'
     might be used to represent all of "e," "e^," "e`," and "e'."  In
     this case, '[[=e=]]' is a regexp that matches any of 'e', 'e^',
     'e'', or 'e`'.

   These features are very valuable in non-English-speaking locales.

     CAUTION: The library functions that 'gawk' uses for regular
     expression matching currently recognize only POSIX character
     classes; they do not recognize collating symbols or equivalence
     classes.

   Inside a bracket expression, an opening bracket ('[') that does not
start a character class, collating element or equivalence class is taken
literally.  This is also true of '.' and '*'.


File: gawk.info,  Node: Leftmost Longest,  Next: Computed Regexps,  Prev: Bracket Expressions,  Up: Regexp

3.5 How Much Text Matches?
==========================

Consider the following:

     echo aaaabcd | awk '{ sub(/a+/, "<A>"); print }'

   This example uses the 'sub()' function to make a change to the input
record.  ('sub()' replaces the first instance of any text matched by the
first argument with the string provided as the second argument; *note
String Functions::.)  Here, the regexp '/a+/' indicates "one or more 'a'
characters," and the replacement text is '<A>'.

   The input contains four 'a' characters.  'awk' (and POSIX) regular
expressions always match the leftmost, _longest_ sequence of input
characters that can match.  Thus, all four 'a' characters are replaced
with '<A>' in this example:

     $ echo aaaabcd | awk '{ sub(/a+/, "<A>"); print }'
     -| <A>bcd

   For simple match/no-match tests, this is not so important.  But when
doing text matching and substitutions with the 'match()', 'sub()',
'gsub()', and 'gensub()' functions, it is very important.  *Note String
Functions::, for more information on these functions.  Understanding
this principle is also important for regexp-based record and field
splitting (*note Records::, and also *note Field Separators::).


File: gawk.info,  Node: Computed Regexps,  Next: GNU Regexp Operators,  Prev: Leftmost Longest,  Up: Regexp

3.6 Using Dynamic Regexps
=========================

The righthand side of a '~' or '!~' operator need not be a regexp
constant (i.e., a string of characters between slashes).  It may be any
expression.  The expression is evaluated and converted to a string if
necessary; the contents of the string are then used as the regexp.  A
regexp computed in this way is called a "dynamic regexp" or a "computed
regexp":

     BEGIN { digits_regexp = "[[:digit:]]+" }
     $0 ~ digits_regexp    { print }

This sets 'digits_regexp' to a regexp that describes one or more digits,
and tests whether the input record matches this regexp.

     NOTE: When using the '~' and '!~' operators, be aware that there is
     a difference between a regexp constant enclosed in slashes and a
     string constant enclosed in double quotes.  If you are going to use
     a string constant, you have to understand that the string is, in
     essence, scanned _twice_: the first time when 'awk' reads your
     program, and the second time when it goes to match the string on
     the lefthand side of the operator with the pattern on the right.
     This is true of any string-valued expression (such as
     'digits_regexp', shown in the previous example), not just string
     constants.

   What difference does it make if the string is scanned twice?  The
answer has to do with escape sequences, and particularly with
backslashes.  To get a backslash into a regular expression inside a
string, you have to type two backslashes.

   For example, '/\*/' is a regexp constant for a literal '*'.  Only one
backslash is needed.  To do the same thing with a string, you have to
type '"\\*"'.  The first backslash escapes the second one so that the
string actually contains the two characters '\' and '*'.

   Given that you can use both regexp and string constants to describe
regular expressions, which should you use?  The answer is "regexp
constants," for several reasons:

   * String constants are more complicated to write and more difficult
     to read.  Using regexp constants makes your programs less
     error-prone.  Not understanding the difference between the two
     kinds of constants is a common source of errors.

   * It is more efficient to use regexp constants.  'awk' can note that
     you have supplied a regexp and store it internally in a form that
     makes pattern matching more efficient.  When using a string
     constant, 'awk' must first convert the string into this internal
     form and then perform the pattern matching.

   * Using regexp constants is better form; it shows clearly that you
     intend a regexp match.

         Using '\n' in Bracket Expressions of Dynamic Regexps

   Some older versions of 'awk' do not allow the newline character to be
used inside a bracket expression for a dynamic regexp:

     $ awk '$0 ~ "[ \t\n]"'
     error-> awk: newline in character class [
     error-> ]...
     error->  source line number 1
     error->  context is
     error->        $0 ~ "[ >>>  \t\n]" <<<

   But a newline in a regexp constant works with no problem:

     $ awk '$0 ~ /[ \t\n]/'
     here is a sample line
     -| here is a sample line
     Ctrl-d

   'gawk' does not have this problem, and it isn't likely to occur often
in practice, but it's worth noting for future reference.


File: gawk.info,  Node: GNU Regexp Operators,  Next: Case-sensitivity,  Prev: Computed Regexps,  Up: Regexp

3.7 'gawk'-Specific Regexp Operators
====================================

GNU software that deals with regular expressions provides a number of
additional regexp operators.  These operators are described in this
minor node and are specific to 'gawk'; they are not available in other
'awk' implementations.  Most of the additional operators deal with word
matching.  For our purposes, a "word" is a sequence of one or more
letters, digits, or underscores ('_'):

'\s'
     Matches any whitespace character.  Think of it as shorthand for
     '[[:space:]]'.

'\S'
     Matches any character that is not whitespace.  Think of it as
     shorthand for '[^[:space:]]'.

'\w'
     Matches any word-constituent character--that is, it matches any
     letter, digit, or underscore.  Think of it as shorthand for
     '[[:alnum:]_]'.

'\W'
     Matches any character that is not word-constituent.  Think of it as
     shorthand for '[^[:alnum:]_]'.

'\<'
     Matches the empty string at the beginning of a word.  For example,
     '/\<away/' matches 'away' but not 'stowaway'.

'\>'
     Matches the empty string at the end of a word.  For example,
     '/stow\>/' matches 'stow' but not 'stowaway'.

'\y'
     Matches the empty string at either the beginning or the end of a
     word (i.e., the word boundar*y*).  For example, '\yballs?\y'
     matches either 'ball' or 'balls', as a separate word.

'\B'
     Matches the empty string that occurs between two word-constituent
     characters.  For example, '/\Brat\B/' matches 'crate', but it does
     not match 'dirty rat'.  '\B' is essentially the opposite of '\y'.

   There are two other operators that work on buffers.  In Emacs, a
"buffer" is, naturally, an Emacs buffer.  Other GNU programs, including
'gawk', consider the entire string to match as the buffer.  The
operators are:

'\`'
     Matches the empty string at the beginning of a buffer (string)

'\''
     Matches the empty string at the end of a buffer (string)

   Because '^' and '$' always work in terms of the beginning and end of
strings, these operators don't add any new capabilities for 'awk'.  They
are provided for compatibility with other GNU software.

   In other GNU software, the word-boundary operator is '\b'.  However,
that conflicts with the 'awk' language's definition of '\b' as
backspace, so 'gawk' uses a different letter.  An alternative method
would have been to require two backslashes in the GNU operators, but
this was deemed too confusing.  The current method of using '\y' for the
GNU '\b' appears to be the lesser of two evils.

   The various command-line options (*note Options::) control how 'gawk'
interprets characters in regexps:

No options
     In the default case, 'gawk' provides all the facilities of POSIX
     regexps and the GNU regexp operators described in *note Regexp
     Operators::.

'--posix'
     Match only POSIX regexps; the GNU operators are not special (e.g.,
     '\w' matches a literal 'w').  Interval expressions are allowed.

'--traditional'
     Match traditional Unix 'awk' regexps.  The GNU operators are not
     special, and interval expressions are not available.  Because BWK
     'awk' supports them, the POSIX character classes ('[[:alnum:]]',
     etc.)  are available.  Characters described by octal and
     hexadecimal escape sequences are treated literally, even if they
     represent regexp metacharacters.

'--re-interval'
     Allow interval expressions in regexps, if '--traditional' has been
     provided.  Otherwise, interval expressions are available by
     default.


File: gawk.info,  Node: Case-sensitivity,  Next: Regexp Summary,  Prev: GNU Regexp Operators,  Up: Regexp

3.8 Case Sensitivity in Matching
================================

Case is normally significant in regular expressions, both when matching
ordinary characters (i.e., not metacharacters) and inside bracket
expressions.  Thus, a 'w' in a regular expression matches only a
lowercase 'w' and not an uppercase 'W'.

   The simplest way to do a case-independent match is to use a bracket
expression--for example, '[Ww]'.  However, this can be cumbersome if you
need to use it often, and it can make the regular expressions harder to
read.  There are two alternatives that you might prefer.

   One way to perform a case-insensitive match at a particular point in
the program is to convert the data to a single case, using the
'tolower()' or 'toupper()' built-in string functions (which we haven't
discussed yet; *note String Functions::).  For example:

     tolower($1) ~ /foo/  { ... }

converts the first field to lowercase before matching against it.  This
works in any POSIX-compliant 'awk'.

   Another method, specific to 'gawk', is to set the variable
'IGNORECASE' to a nonzero value (*note Built-in Variables::).  When
'IGNORECASE' is not zero, _all_ regexp and string operations ignore
case.

   Changing the value of 'IGNORECASE' dynamically controls the case
sensitivity of the program as it runs.  Case is significant by default
because 'IGNORECASE' (like most variables) is initialized to zero:

     x = "aB"
     if (x ~ /ab/) ...   # this test will fail

     IGNORECASE = 1
     if (x ~ /ab/) ...   # now it will succeed

   In general, you cannot use 'IGNORECASE' to make certain rules case
insensitive and other rules case sensitive, as there is no
straightforward way to set 'IGNORECASE' just for the pattern of a
particular rule.(1)  To do this, use either bracket expressions or
'tolower()'.  However, one thing you can do with 'IGNORECASE' only is
dynamically turn case sensitivity on or off for all the rules at once.

   'IGNORECASE' can be set on the command line or in a 'BEGIN' rule
(*note Other Arguments::; also *note Using BEGIN/END::).  Setting
'IGNORECASE' from the command line is a way to make a program case
insensitive without having to edit it.

   In multibyte locales, the equivalences between upper- and lowercase
characters are tested based on the wide-character values of the locale's
character set.  Otherwise, the characters are tested based on the
ISO-8859-1 (ISO Latin-1) character set.  This character set is a
superset of the traditional 128 ASCII characters, which also provides a
number of characters suitable for use with European languages.(2)

   The value of 'IGNORECASE' has no effect if 'gawk' is in compatibility
mode (*note Options::).  Case is always significant in compatibility
mode.

   ---------- Footnotes ----------

   (1) Experienced C and C++ programmers will note that it is possible,
using something like 'IGNORECASE = 1 && /foObAr/ { ... }' and
'IGNORECASE = 0 || /foobar/ { ... }'.  However, this is somewhat obscure
and we don't recommend it.

   (2) If you don't understand this, don't worry about it; it just means
that 'gawk' does the right thing.


File: gawk.info,  Node: Regexp Summary,  Prev: Case-sensitivity,  Up: Regexp

3.9 Summary
===========

   * Regular expressions describe sets of strings to be matched.  In
     'awk', regular expression constants are written enclosed between
     slashes: '/'...'/'.

   * Regexp constants may be used standalone in patterns and in
     conditional expressions, or as part of matching expressions using
     the '~' and '!~' operators.

   * Escape sequences let you represent nonprintable characters and also
     let you represent regexp metacharacters as literal characters to be
     matched.

   * Regexp operators provide grouping, alternation, and repetition.

   * Bracket expressions give you a shorthand for specifying sets of
     characters that can match at a particular point in a regexp.
     Within bracket expressions, POSIX character classes let you specify
     certain groups of characters in a locale-independent fashion.

   * Regular expressions match the leftmost longest text in the string
     being matched.  This matters for cases where you need to know the
     extent of the match, such as for text substitution and when the
     record separator is a regexp.

   * Matching expressions may use dynamic regexps (i.e., string values
     treated as regular expressions).

   * 'gawk''s 'IGNORECASE' variable lets you control the case
     sensitivity of regexp matching.  In other 'awk' versions, use
     'tolower()' or 'toupper()'.


File: gawk.info,  Node: Reading Files,  Next: Printing,  Prev: Regexp,  Up: Top

4 Reading Input Files
*********************

In the typical 'awk' program, 'awk' reads all input either from the
standard input (by default, this is the keyboard, but often it is a pipe
from another command) or from files whose names you specify on the 'awk'
command line.  If you specify input files, 'awk' reads them in order,
processing all the data from one before going on to the next.  The name
of the current input file can be found in the predefined variable
'FILENAME' (*note Built-in Variables::).

   The input is read in units called "records", and is processed by the
rules of your program one record at a time.  By default, each record is
one line.  Each record is automatically split into chunks called
"fields".  This makes it more convenient for programs to work on the
parts of a record.

   On rare occasions, you may need to use the 'getline' command.  The
'getline' command is valuable both because it can do explicit input from
any number of files, and because the files used with it do not have to
be named on the 'awk' command line (*note Getline::).

* Menu:

* Records::                     Controlling how data is split into records.
* Fields::                      An introduction to fields.
* Nonconstant Fields::          Nonconstant Field Numbers.
* Changing Fields::             Changing the Contents of a Field.
* Field Separators::            The field separator and how to change it.
* Constant Size::               Reading constant width data.
* Splitting By Content::        Defining Fields By Content
* Multiple Line::               Reading multiline records.
* Getline::                     Reading files under explicit program control
                                using the 'getline' function.
* Read Timeout::                Reading input with a timeout.
* Command-line directories::    What happens if you put a directory on the
                                command line.
* Input Summary::               Input summary.
* Input Exercises::             Exercises.


File: gawk.info,  Node: Records,  Next: Fields,  Up: Reading Files

4.1 How Input Is Split into Records
===================================

'awk' divides the input for your program into records and fields.  It
keeps track of the number of records that have been read so far from the
current input file.  This value is stored in a predefined variable
called 'FNR', which is reset to zero every time a new file is started.
Another predefined variable, 'NR', records the total number of input
records read so far from all data files.  It starts at zero, but is
never automatically reset to zero.

* Menu:

* awk split records::           How standard 'awk' splits records.
* gawk split records::          How 'gawk' splits records.


File: gawk.info,  Node: awk split records,  Next: gawk split records,  Up: Records

4.1.1 Record Splitting with Standard 'awk'
------------------------------------------

Records are separated by a character called the "record separator".  By
default, the record separator is the newline character.  This is why
records are, by default, single lines.  To use a different character for
the record separator, simply assign that character to the predefined
variable 'RS'.

   Like any other variable, the value of 'RS' can be changed in the
'awk' program with the assignment operator, '=' (*note Assignment
Ops::).  The new record-separator character should be enclosed in
quotation marks, which indicate a string constant.  Often, the right
time to do this is at the beginning of execution, before any input is
processed, so that the very first record is read with the proper
separator.  To do this, use the special 'BEGIN' pattern (*note
BEGIN/END::).  For example:

     awk 'BEGIN { RS = "u" }
          { print $0 }' mail-list

changes the value of 'RS' to 'u', before reading any input.  The new
value is a string whose first character is the letter "u"; as a result,
records are separated by the letter "u".  Then the input file is read,
and the second rule in the 'awk' program (the action with no pattern)
prints each record.  Because each 'print' statement adds a newline at
the end of its output, this 'awk' program copies the input with each 'u'
changed to a newline.  Here are the results of running the program on
'mail-list':

     $ awk 'BEGIN { RS = "u" }
     >      { print $0 }' mail-list
     -| Amelia       555-5553     amelia.zodiac
     -| sq
     -| e@gmail.com    F
     -| Anthony      555-3412     anthony.assert
     -| ro@hotmail.com   A
     -| Becky        555-7685     becky.algebrar
     -| m@gmail.com      A
     -| Bill         555-1675     bill.drowning@hotmail.com       A
     -| Broderick    555-0542     broderick.aliq
     -| otiens@yahoo.com R
     -| Camilla      555-2912     camilla.inf
     -| sar
     -| m@skynet.be     R
     -| Fabi
     -| s       555-1234     fabi
     -| s.
     -| ndevicesim
     -| s@
     -| cb.ed
     -|     F
     -| J
     -| lie        555-6699     j
     -| lie.perscr
     -| tabor@skeeve.com   F
     -| Martin       555-6480     martin.codicib
     -| s@hotmail.com    A
     -| Sam
     -| el       555-3430     sam
     -| el.lanceolis@sh
     -| .ed
     -|         A
     -| Jean-Pa
     -| l    555-2127     jeanpa
     -| l.campanor
     -| m@ny
     -| .ed
     -|      R
     -|

Note that the entry for the name 'Bill' is not split.  In the original
data file (*note Sample Data Files::), the line looks like this:

     Bill         555-1675     bill.drowning@hotmail.com       A

It contains no 'u', so there is no reason to split the record, unlike
the others, which each have one or more occurrences of the 'u'.  In
fact, this record is treated as part of the previous record; the newline
separating them in the output is the original newline in the data file,
not the one added by 'awk' when it printed the record!

   Another way to change the record separator is on the command line,
using the variable-assignment feature (*note Other Arguments::):

     awk '{ print $0 }' RS="u" mail-list

This sets 'RS' to 'u' before processing 'mail-list'.

   Using an alphabetic character such as 'u' for the record separator is
highly likely to produce strange results.  Using an unusual character
such as '/' is more likely to produce correct behavior in the majority
of cases, but there are no guarantees.  The moral is: Know Your Data.

   When using regular characters as the record separator, there is one
unusual case that occurs when 'gawk' is being fully POSIX-compliant
(*note Options::).  Then, the following (extreme) pipeline prints a
surprising '1':

     $ echo | gawk --posix 'BEGIN { RS = "a" } ; { print NF }'
     -| 1

   There is one field, consisting of a newline.  The value of the
built-in variable 'NF' is the number of fields in the current record.
(In the normal case, 'gawk' treats the newline as whitespace, printing
'0' as the result.  Most other versions of 'awk' also act this way.)

   Reaching the end of an input file terminates the current input
record, even if the last character in the file is not the character in
'RS'.  (d.c.)

   The empty string '""' (a string without any characters) has a special
meaning as the value of 'RS'.  It means that records are separated by
one or more blank lines and nothing else.  *Note Multiple Line:: for
more details.

   If you change the value of 'RS' in the middle of an 'awk' run, the
new value is used to delimit subsequent records, but the record
currently being processed, as well as records already processed, are not
affected.

   After the end of the record has been determined, 'gawk' sets the
variable 'RT' to the text in the input that matched 'RS'.


File: gawk.info,  Node: gawk split records,  Prev: awk split records,  Up: Records

4.1.2 Record Splitting with 'gawk'
----------------------------------

When using 'gawk', the value of 'RS' is not limited to a one-character
string.  It can be any regular expression (*note Regexp::).  (c.e.)  In
general, each record ends at the next string that matches the regular
expression; the next record starts at the end of the matching string.
This general rule is actually at work in the usual case, where 'RS'
contains just a newline: a record ends at the beginning of the next
matching string (the next newline in the input), and the following
record starts just after the end of this string (at the first character
of the following line).  The newline, because it matches 'RS', is not
part of either record.

   When 'RS' is a single character, 'RT' contains the same single
character.  However, when 'RS' is a regular expression, 'RT' contains
the actual input text that matched the regular expression.

   If the input file ends without any text matching 'RS', 'gawk' sets
'RT' to the null string.

   The following example illustrates both of these features.  It sets
'RS' equal to a regular expression that matches either a newline or a
series of one or more uppercase letters with optional leading and/or
trailing whitespace:

     $ echo record 1 AAAA record 2 BBBB record 3 |
     > gawk 'BEGIN { RS = "\n|( *[[:upper:]]+ *)" }
     >             { print "Record =", $0,"and RT = [" RT "]" }'
     -| Record = record 1 and RT = [ AAAA ]
     -| Record = record 2 and RT = [ BBBB ]
     -| Record = record 3 and RT = [
     -| ]

The square brackets delineate the contents of 'RT', letting you see the
leading and trailing whitespace.  The final value of 'RT' is a newline.
*Note Simple Sed:: for a more useful example of 'RS' as a regexp and
'RT'.

   If you set 'RS' to a regular expression that allows optional trailing
text, such as 'RS = "abc(XYZ)?"', it is possible, due to implementation
constraints, that 'gawk' may match the leading part of the regular
expression, but not the trailing part, particularly if the input text
that could match the trailing part is fairly long.  'gawk' attempts to
avoid this problem, but currently, there's no guarantee that this will
never happen.

     NOTE: Remember that in 'awk', the '^' and '$' anchor metacharacters
     match the beginning and end of a _string_, and not the beginning
     and end of a _line_.  As a result, something like 'RS =
     "^[[:upper:]]"' can only match at the beginning of a file.  This is
     because 'gawk' views the input file as one long string that happens
     to contain newline characters.  It is thus best to avoid anchor
     metacharacters in the value of 'RS'.

   The use of 'RS' as a regular expression and the 'RT' variable are
'gawk' extensions; they are not available in compatibility mode (*note
Options::).  In compatibility mode, only the first character of the
value of 'RS' determines the end of the record.

                      'RS = "\0"' Is Not Portable

   There are times when you might want to treat an entire data file as a
single record.  The only way to make this happen is to give 'RS' a value
that you know doesn't occur in the input file.  This is hard to do in a
general way, such that a program always works for arbitrary input files.

   You might think that for text files, the NUL character, which
consists of a character with all bits equal to zero, is a good value to
use for 'RS' in this case:

     BEGIN { RS = "\0" }  # whole file becomes one record?

   'gawk' in fact accepts this, and uses the NUL character for the
record separator.  This works for certain special files, such as
'/proc/environ' on GNU/Linux systems, where the NUL character is in fact
the record separator.  However, this usage is _not_ portable to most
other 'awk' implementations.

   Almost all other 'awk' implementations(1) store strings internally as
C-style strings.  C strings use the NUL character as the string
terminator.  In effect, this means that 'RS = "\0"' is the same as 'RS =
""'.  (d.c.)

   It happens that recent versions of 'mawk' can use the NUL character
as a record separator.  However, this is a special case: 'mawk' does not
allow embedded NUL characters in strings.  (This may change in a future
version of 'mawk'.)

   *Note Readfile Function:: for an interesting way to read whole files.
If you are using 'gawk', see *note Extension Sample Readfile:: for
another option.

   ---------- Footnotes ----------

   (1) At least that we know about.


File: gawk.info,  Node: Fields,  Next: Nonconstant Fields,  Prev: Records,  Up: Reading Files

4.2 Examining Fields
====================

When 'awk' reads an input record, the record is automatically "parsed"
or separated by the 'awk' utility into chunks called "fields".  By
default, fields are separated by "whitespace", like words in a line.
Whitespace in 'awk' means any string of one or more spaces, TABs, or
newlines;(1) other characters that are considered whitespace by other
languages (such as formfeed, vertical tab, etc.)  are _not_ considered
whitespace by 'awk'.

   The purpose of fields is to make it more convenient for you to refer
to these pieces of the record.  You don't have to use them--you can
operate on the whole record if you want--but fields are what make simple
'awk' programs so powerful.

   You use a dollar sign ('$') to refer to a field in an 'awk' program,
followed by the number of the field you want.  Thus, '$1' refers to the
first field, '$2' to the second, and so on.  (Unlike in the Unix shells,
the field numbers are not limited to single digits.  '$127' is the 127th
field in the record.)  For example, suppose the following is a line of
input:

     This seems like a pretty nice example.

Here the first field, or '$1', is 'This', the second field, or '$2', is
'seems', and so on.  Note that the last field, '$7', is 'example.'.
Because there is no space between the 'e' and the '.', the period is
considered part of the seventh field.

   'NF' is a predefined variable whose value is the number of fields in
the current record.  'awk' automatically updates the value of 'NF' each
time it reads a record.  No matter how many fields there are, the last
field in a record can be represented by '$NF'.  So, '$NF' is the same as
'$7', which is 'example.'.  If you try to reference a field beyond the
last one (such as '$8' when the record has only seven fields), you get
the empty string.  (If used in a numeric operation, you get zero.)

   The use of '$0', which looks like a reference to the "zeroth" field,
is a special case: it represents the whole input record.  Use it when
you are not interested in specific fields.  Here are some more examples:

     $ awk '$1 ~ /li/ { print $0 }' mail-list
     -| Amelia       555-5553     amelia.zodiacusque@gmail.com    F
     -| Julie        555-6699     julie.perscrutabor@skeeve.com   F

This example prints each record in the file 'mail-list' whose first
field contains the string 'li'.

   By contrast, the following example looks for 'li' in _the entire
record_ and prints the first and last fields for each matching input
record:

     $ awk '/li/ { print $1, $NF }' mail-list
     -| Amelia F
     -| Broderick R
     -| Julie F
     -| Samuel A

   ---------- Footnotes ----------

   (1) In POSIX 'awk', newlines are not considered whitespace for
separating fields.


File: gawk.info,  Node: Nonconstant Fields,  Next: Changing Fields,  Prev: Fields,  Up: Reading Files

4.3 Nonconstant Field Numbers
=============================

A field number need not be a constant.  Any expression in the 'awk'
language can be used after a '$' to refer to a field.  The value of the
expression specifies the field number.  If the value is a string, rather
than a number, it is converted to a number.  Consider this example:

     awk '{ print $NR }'

Recall that 'NR' is the number of records read so far: one in the first
record, two in the second, and so on.  So this example prints the first
field of the first record, the second field of the second record, and so
on.  For the twentieth record, field number 20 is printed; most likely,
the record has fewer than 20 fields, so this prints a blank line.  Here
is another example of using expressions as field numbers:

     awk '{ print $(2*2) }' mail-list

   'awk' evaluates the expression '(2*2)' and uses its value as the
number of the field to print.  The '*' represents multiplication, so the
expression '2*2' evaluates to four.  The parentheses are used so that
the multiplication is done before the '$' operation; they are necessary
whenever there is a binary operator(1) in the field-number expression.
This example, then, prints the type of relationship (the fourth field)
for every line of the file 'mail-list'.  (All of the 'awk' operators are
listed, in order of decreasing precedence, in *note Precedence::.)

   If the field number you compute is zero, you get the entire record.
Thus, '$(2-2)' has the same value as '$0'.  Negative field numbers are
not allowed; trying to reference one usually terminates the program.
(The POSIX standard does not define what happens when you reference a
negative field number.  'gawk' notices this and terminates your program.
Other 'awk' implementations may behave differently.)

   As mentioned in *note Fields::, 'awk' stores the current record's
number of fields in the built-in variable 'NF' (also *note Built-in
Variables::).  Thus, the expression '$NF' is not a special feature--it
is the direct consequence of evaluating 'NF' and using its value as a
field number.

   ---------- Footnotes ----------

   (1) A "binary operator", such as '*' for multiplication, is one that
takes two operands.  The distinction is required because 'awk' also has
unary (one-operand) and ternary (three-operand) operators.


File: gawk.info,  Node: Changing Fields,  Next: Field Separators,  Prev: Nonconstant Fields,  Up: Reading Files

4.4 Changing the Contents of a Field
====================================

The contents of a field, as seen by 'awk', can be changed within an
'awk' program; this changes what 'awk' perceives as the current input
record.  (The actual input is untouched; 'awk' _never_ modifies the
input file.)  Consider the following example and its output:

     $ awk '{ nboxes = $3 ; $3 = $3 - 10
     >        print nboxes, $3 }' inventory-shipped
     -| 25 15
     -| 32 22
     -| 24 14
     ...

The program first saves the original value of field three in the
variable 'nboxes'.  The '-' sign represents subtraction, so this program
reassigns field three, '$3', as the original value of field three minus
ten: '$3 - 10'.  (*Note Arithmetic Ops::.)  Then it prints the original
and new values for field three.  (Someone in the warehouse made a
consistent mistake while inventorying the red boxes.)

   For this to work, the text in '$3' must make sense as a number; the
string of characters must be converted to a number for the computer to
do arithmetic on it.  The number resulting from the subtraction is
converted back to a string of characters that then becomes field three.
*Note Conversion::.

   When the value of a field is changed (as perceived by 'awk'), the
text of the input record is recalculated to contain the new field where
the old one was.  In other words, '$0' changes to reflect the altered
field.  Thus, this program prints a copy of the input file, with 10
subtracted from the second field of each line:

     $ awk '{ $2 = $2 - 10; print $0 }' inventory-shipped
     -| Jan 3 25 15 115
     -| Feb 5 32 24 226
     -| Mar 5 24 34 228
     ...

   It is also possible to assign contents to fields that are out of
range.  For example:

     $ awk '{ $6 = ($5 + $4 + $3 + $2)
     >        print $6 }' inventory-shipped
     -| 168
     -| 297
     -| 301
     ...

We've just created '$6', whose value is the sum of fields '$2', '$3',
'$4', and '$5'.  The '+' sign represents addition.  For the file
'inventory-shipped', '$6' represents the total number of parcels shipped
for a particular month.

   Creating a new field changes 'awk''s internal copy of the current
input record, which is the value of '$0'.  Thus, if you do 'print $0'
after adding a field, the record printed includes the new field, with
the appropriate number of field separators between it and the previously
existing fields.

   This recomputation affects and is affected by 'NF' (the number of
fields; *note Fields::).  For example, the value of 'NF' is set to the
number of the highest field you create.  The exact format of '$0' is
also affected by a feature that has not been discussed yet: the "output
field separator", 'OFS', used to separate the fields (*note Output
Separators::).

   Note, however, that merely _referencing_ an out-of-range field does
_not_ change the value of either '$0' or 'NF'.  Referencing an
out-of-range field only produces an empty string.  For example:

     if ($(NF+1) != "")
         print "can't happen"
     else
         print "everything is normal"

should print 'everything is normal', because 'NF+1' is certain to be out
of range.  (*Note If Statement:: for more information about 'awk''s
'if-else' statements.  *Note Typing and Comparison:: for more
information about the '!=' operator.)

   It is important to note that making an assignment to an existing
field changes the value of '$0' but does not change the value of 'NF',
even when you assign the empty string to a field.  For example:

     $ echo a b c d | awk '{ OFS = ":"; $2 = ""
     >                       print $0; print NF }'
     -| a::c:d
     -| 4

The field is still there; it just has an empty value, delimited by the
two colons between 'a' and 'c'.  This example shows what happens if you
create a new field:

     $ echo a b c d | awk '{ OFS = ":"; $2 = ""; $6 = "new"
     >                       print $0; print NF }'
     -| a::c:d::new
     -| 6

The intervening field, '$5', is created with an empty value (indicated
by the second pair of adjacent colons), and 'NF' is updated with the
value six.

   Decrementing 'NF' throws away the values of the fields after the new
value of 'NF' and recomputes '$0'.  (d.c.)  Here is an example:

     $ echo a b c d e f | awk '{ print "NF =", NF;
     >                           NF = 3; print $0 }'
     -| NF = 6
     -| a b c

     CAUTION: Some versions of 'awk' don't rebuild '$0' when 'NF' is
     decremented.

   Finally, there are times when it is convenient to force 'awk' to
rebuild the entire record, using the current values of the fields and
'OFS'.  To do this, use the seemingly innocuous assignment:

     $1 = $1   # force record to be reconstituted
     print $0  # or whatever else with $0

This forces 'awk' to rebuild the record.  It does help to add a comment,
as we've shown here.

   There is a flip side to the relationship between '$0' and the fields.
Any assignment to '$0' causes the record to be reparsed into fields
using the _current_ value of 'FS'.  This also applies to any built-in
function that updates '$0', such as 'sub()' and 'gsub()' (*note String
Functions::).

                          Understanding '$0'

   It is important to remember that '$0' is the _full_ record, exactly
as it was read from the input.  This includes any leading or trailing
whitespace, and the exact whitespace (or other characters) that
separates the fields.

   It is a common error to try to change the field separators in a
record simply by setting 'FS' and 'OFS', and then expecting a plain
'print' or 'print $0' to print the modified record.

   But this does not work, because nothing was done to change the record
itself.  Instead, you must force the record to be rebuilt, typically
with a statement such as '$1 = $1', as described earlier.


File: gawk.info,  Node: Field Separators,  Next: Constant Size,  Prev: Changing Fields,  Up: Reading Files

4.5 Specifying How Fields Are Separated
=======================================

* Menu:

* Default Field Splitting::      How fields are normally separated.
* Regexp Field Splitting::       Using regexps as the field separator.
* Single Character Fields::      Making each character a separate field.
* Command Line Field Separator:: Setting 'FS' from the command line.
* Full Line Fields::             Making the full line be a single field.
* Field Splitting Summary::      Some final points and a summary table.

The "field separator", which is either a single character or a regular
expression, controls the way 'awk' splits an input record into fields.
'awk' scans the input record for character sequences that match the
separator; the fields themselves are the text between the matches.

   In the examples that follow, we use the bullet symbol (*) to
represent spaces in the output.  If the field separator is 'oo', then
the following line:

     moo goo gai pan

is split into three fields: 'm', '*g', and '*gai*pan'.  Note the leading
spaces in the values of the second and third fields.

   The field separator is represented by the predefined variable 'FS'.
Shell programmers take note: 'awk' does _not_ use the name 'IFS' that is
used by the POSIX-compliant shells (such as the Unix Bourne shell, 'sh',
or Bash).

   The value of 'FS' can be changed in the 'awk' program with the
assignment operator, '=' (*note Assignment Ops::).  Often, the right
time to do this is at the beginning of execution before any input has
been processed, so that the very first record is read with the proper
separator.  To do this, use the special 'BEGIN' pattern (*note
BEGIN/END::).  For example, here we set the value of 'FS' to the string
'","':

     awk 'BEGIN { FS = "," } ; { print $2 }'

Given the input line:

     John Q. Smith, 29 Oak St., Walamazoo, MI 42139

this 'awk' program extracts and prints the string '*29*Oak*St.'.

   Sometimes the input data contains separator characters that don't
separate fields the way you thought they would.  For instance, the
person's name in the example we just used might have a title or suffix
attached, such as:

     John Q. Smith, LXIX, 29 Oak St., Walamazoo, MI 42139

The same program would extract '*LXIX' instead of '*29*Oak*St.'.  If you
were expecting the program to print the address, you would be surprised.
The moral is to choose your data layout and separator characters
carefully to prevent such problems.  (If the data is not in a form that
is easy to process, perhaps you can massage it first with a separate
'awk' program.)


File: gawk.info,  Node: Default Field Splitting,  Next: Regexp Field Splitting,  Up: Field Separators

4.5.1 Whitespace Normally Separates Fields
------------------------------------------

Fields are normally separated by whitespace sequences (spaces, TABs, and
newlines), not by single spaces.  Two spaces in a row do not delimit an
empty field.  The default value of the field separator 'FS' is a string
containing a single space, '" "'.  If 'awk' interpreted this value in
the usual way, each space character would separate fields, so two spaces
in a row would make an empty field between them.  The reason this does
not happen is that a single space as the value of 'FS' is a special
case--it is taken to specify the default manner of delimiting fields.

   If 'FS' is any other single character, such as '","', then each
occurrence of that character separates two fields.  Two consecutive
occurrences delimit an empty field.  If the character occurs at the
beginning or the end of the line, that too delimits an empty field.  The
space character is the only single character that does not follow these
rules.


File: gawk.info,  Node: Regexp Field Splitting,  Next: Single Character Fields,  Prev: Default Field Splitting,  Up: Field Separators

4.5.2 Using Regular Expressions to Separate Fields
--------------------------------------------------

The previous node discussed the use of single characters or simple
strings as the value of 'FS'.  More generally, the value of 'FS' may be
a string containing any regular expression.  In this case, each match in
the record for the regular expression separates fields.  For example,
the assignment:

     FS = ", \t"

makes every area of an input line that consists of a comma followed by a
space and a TAB into a field separator.  ('\t' is an "escape sequence"
that stands for a TAB; *note Escape Sequences::, for the complete list
of similar escape sequences.)

   For a less trivial example of a regular expression, try using single
spaces to separate fields the way single commas are used.  'FS' can be
set to '"[ ]"' (left bracket, space, right bracket).  This regular
expression matches a single space and nothing else (*note Regexp::).

   There is an important difference between the two cases of 'FS = " "'
(a single space) and 'FS = "[ \t\n]+"' (a regular expression matching
one or more spaces, TABs, or newlines).  For both values of 'FS', fields
are separated by "runs" (multiple adjacent occurrences) of spaces, TABs,
and/or newlines.  However, when the value of 'FS' is '" "', 'awk' first
strips leading and trailing whitespace from the record and then decides
where the fields are.  For example, the following pipeline prints 'b':

     $ echo ' a b c d ' | awk '{ print $2 }'
     -| b

However, this pipeline prints 'a' (note the extra spaces around each
letter):

     $ echo ' a  b  c  d ' | awk 'BEGIN { FS = "[ \t\n]+" }
     >                                  { print $2 }'
     -| a

In this case, the first field is null, or empty.

   The stripping of leading and trailing whitespace also comes into play
whenever '$0' is recomputed.  For instance, study this pipeline:

     $ echo '   a b c d' | awk '{ print; $2 = $2; print }'
     -|    a b c d
     -| a b c d

The first 'print' statement prints the record as it was read, with
leading whitespace intact.  The assignment to '$2' rebuilds '$0' by
concatenating '$1' through '$NF' together, separated by the value of
'OFS' (which is a space by default).  Because the leading whitespace was
ignored when finding '$1', it is not part of the new '$0'.  Finally, the
last 'print' statement prints the new '$0'.

   There is an additional subtlety to be aware of when using regular
expressions for field splitting.  It is not well specified in the POSIX
standard, or anywhere else, what '^' means when splitting fields.  Does
the '^' match only at the beginning of the entire record?  Or is each
field separator a new string?  It turns out that different 'awk'
versions answer this question differently, and you should not rely on
any specific behavior in your programs.  (d.c.)

   As a point of information, BWK 'awk' allows '^' to match only at the
beginning of the record.  'gawk' also works this way.  For example:

     $ echo 'xxAA  xxBxx  C' |
     > gawk -F '(^x+)|( +)' '{ for (i = 1; i <= NF; i++)
     >                             printf "-->%s<--\n", $i }'
     -| --><--
     -| -->AA<--
     -| -->xxBxx<--
     -| -->C<--


File: gawk.info,  Node: Single Character Fields,  Next: Command Line Field Separator,  Prev: Regexp Field Splitting,  Up: Field Separators

4.5.3 Making Each Character a Separate Field
--------------------------------------------

There are times when you may want to examine each character of a record
separately.  This can be done in 'gawk' by simply assigning the null
string ('""') to 'FS'.  (c.e.)  In this case, each individual character
in the record becomes a separate field.  For example:

     $ echo a b | gawk 'BEGIN { FS = "" }
     >                  {
     >                      for (i = 1; i <= NF; i = i + 1)
     >                          print "Field", i, "is", $i
     >                  }'
     -| Field 1 is a
     -| Field 2 is
     -| Field 3 is b

   Traditionally, the behavior of 'FS' equal to '""' was not defined.
In this case, most versions of Unix 'awk' simply treat the entire record
as only having one field.  (d.c.)  In compatibility mode (*note
Options::), if 'FS' is the null string, then 'gawk' also behaves this
way.


File: gawk.info,  Node: Command Line Field Separator,  Next: Full Line Fields,  Prev: Single Character Fields,  Up: Field Separators

4.5.4 Setting 'FS' from the Command Line
----------------------------------------

'FS' can be set on the command line.  Use the '-F' option to do so.  For
example:

     awk -F, 'PROGRAM' INPUT-FILES

sets 'FS' to the ',' character.  Notice that the option uses an
uppercase 'F' instead of a lowercase 'f'.  The latter option ('-f')
specifies a file containing an 'awk' program.

   The value used for the argument to '-F' is processed in exactly the
same way as assignments to the predefined variable 'FS'.  Any special
characters in the field separator must be escaped appropriately.  For
example, to use a '\' as the field separator on the command line, you
would have to type:

     # same as FS = "\\"
     awk -F\\\\ '...' files ...

Because '\' is used for quoting in the shell, 'awk' sees '-F\\'.  Then
'awk' processes the '\\' for escape characters (*note Escape
Sequences::), finally yielding a single '\' to use for the field
separator.

   As a special case, in compatibility mode (*note Options::), if the
argument to '-F' is 't', then 'FS' is set to the TAB character.  If you
type '-F\t' at the shell, without any quotes, the '\' gets deleted, so
'awk' figures that you really want your fields to be separated with TABs
and not 't's.  Use '-v FS="t"' or '-F"[t]"' on the command line if you
really do want to separate your fields with 't's.  Use '-F '\t'' when
not in compatibility mode to specify that TABs separate fields.

   As an example, let's use an 'awk' program file called 'edu.awk' that
contains the pattern '/edu/' and the action 'print $1':

     /edu/   { print $1 }

   Let's also set 'FS' to be the '-' character and run the program on
the file 'mail-list'.  The following command prints a list of the names
of the people that work at or attend a university, and the first three
digits of their phone numbers:

     $ awk -F- -f edu.awk mail-list
     -| Fabius       555
     -| Samuel       555
     -| Jean

Note the third line of output.  The third line in the original file
looked like this:

     Jean-Paul    555-2127     jeanpaul.campanorum@nyu.edu     R

   The '-' as part of the person's name was used as the field separator,
instead of the '-' in the phone number that was originally intended.
This demonstrates why you have to be careful in choosing your field and
record separators.

   Perhaps the most common use of a single character as the field
separator occurs when processing the Unix system password file.  On many
Unix systems, each user has a separate entry in the system password
file, with one line per user.  The information in these lines is
separated by colons.  The first field is the user's login name and the
second is the user's encrypted or shadow password.  (A shadow password
is indicated by the presence of a single 'x' in the second field.)  A
password file entry might look like this:

     arnold:x:2076:10:Arnold Robbins:/home/arnold:/bin/bash

   The following program searches the system password file and prints
the entries for users whose full name is not indicated:

     awk -F: '$5 == ""' /etc/passwd


File: gawk.info,  Node: Full Line Fields,  Next: Field Splitting Summary,  Prev: Command Line Field Separator,  Up: Field Separators

4.5.5 Making the Full Line Be a Single Field
--------------------------------------------

Occasionally, it's useful to treat the whole input line as a single
field.  This can be done easily and portably simply by setting 'FS' to
'"\n"' (a newline):(1)

     awk -F'\n' 'PROGRAM' FILES ...

When you do this, '$1' is the same as '$0'.

               Changing 'FS' Does Not Affect the Fields

   According to the POSIX standard, 'awk' is supposed to behave as if
each record is split into fields at the time it is read.  In particular,
this means that if you change the value of 'FS' after a record is read,
the values of the fields (i.e., how they were split) should reflect the
old value of 'FS', not the new one.

   However, many older implementations of 'awk' do not work this way.
Instead, they defer splitting the fields until a field is actually
referenced.  The fields are split using the _current_ value of 'FS'!
(d.c.)  This behavior can be difficult to diagnose.  The following
example illustrates the difference between the two methods:

     sed 1q /etc/passwd | awk '{ FS = ":" ; print $1 }'

which usually prints:

     root

on an incorrect implementation of 'awk', while 'gawk' prints the full
first line of the file, something like:

     root:x:0:0:Root:/:

   (The 'sed'(2) command prints just the first line of '/etc/passwd'.)

   ---------- Footnotes ----------

   (1) Thanks to Andrew Schorr for this tip.

   (2) The 'sed' utility is a "stream editor."  Its behavior is also
defined by the POSIX standard.


File: gawk.info,  Node: Field Splitting Summary,  Prev: Full Line Fields,  Up: Field Separators

4.5.6 Field-Splitting Summary
-----------------------------

It is important to remember that when you assign a string constant as
the value of 'FS', it undergoes normal 'awk' string processing.  For
example, with Unix 'awk' and 'gawk', the assignment 'FS = "\.."' assigns
the character string '".."' to 'FS' (the backslash is stripped).  This
creates a regexp meaning "fields are separated by occurrences of any two
characters."  If instead you want fields to be separated by a literal
period followed by any single character, use 'FS = "\\.."'.

   The following list summarizes how fields are split, based on the
value of 'FS' ('==' means "is equal to"):

'FS == " "'
     Fields are separated by runs of whitespace.  Leading and trailing
     whitespace are ignored.  This is the default.

'FS == ANY OTHER SINGLE CHARACTER'
     Fields are separated by each occurrence of the character.  Multiple
     successive occurrences delimit empty fields, as do leading and
     trailing occurrences.  The character can even be a regexp
     metacharacter; it does not need to be escaped.

'FS == REGEXP'
     Fields are separated by occurrences of characters that match
     REGEXP.  Leading and trailing matches of REGEXP delimit empty
     fields.

'FS == ""'
     Each individual character in the record becomes a separate field.
     (This is a common extension; it is not specified by the POSIX
     standard.)

                         'FS' and 'IGNORECASE'

   The 'IGNORECASE' variable (*note User-modified::) affects field
splitting _only_ when the value of 'FS' is a regexp.  It has no effect
when 'FS' is a single character, even if that character is a letter.
Thus, in the following code:

     FS = "c"
     IGNORECASE = 1
     $0 = "aCa"
     print $1

The output is 'aCa'.  If you really want to split fields on an
alphabetic character while ignoring case, use a regexp that will do it
for you (e.g., 'FS = "[c]"').  In this case, 'IGNORECASE' will take
effect.


File: gawk.info,  Node: Constant Size,  Next: Splitting By Content,  Prev: Field Separators,  Up: Reading Files

4.6 Reading Fixed-Width Data
============================

This minor node discusses an advanced feature of 'gawk'.  If you are a
novice 'awk' user, you might want to skip it on the first reading.

   'gawk' provides a facility for dealing with fixed-width fields with
no distinctive field separator.  For example, data of this nature arises
in the input for old Fortran programs where numbers are run together, or
in the output of programs that did not anticipate the use of their
output as input for other programs.

   An example of the latter is a table where all the columns are lined
up by the use of a variable number of spaces and _empty fields are just
spaces_.  Clearly, 'awk''s normal field splitting based on 'FS' does not
work well in this case.  Although a portable 'awk' program can use a
series of 'substr()' calls on '$0' (*note String Functions::), this is
awkward and inefficient for a large number of fields.

   The splitting of an input record into fixed-width fields is specified
by assigning a string containing space-separated numbers to the built-in
variable 'FIELDWIDTHS'.  Each number specifies the width of the field,
_including_ columns between fields.  If you want to ignore the columns
between fields, you can specify the width as a separate field that is
subsequently ignored.  It is a fatal error to supply a field width that
has a negative value.  The following data is the output of the Unix 'w'
utility.  It is useful to illustrate the use of 'FIELDWIDTHS':

      10:06pm  up 21 days, 14:04,  23 users
     User     tty       login  idle   JCPU   PCPU  what
     hzuo     ttyV0     8:58pm            9      5  vi p24.tex
     hzang    ttyV3     6:37pm    50                -csh
     eklye    ttyV5     9:53pm            7      1  em thes.tex
     dportein ttyV6     8:17pm  1:47                -csh
     gierd    ttyD3    10:00pm     1                elm
     dave     ttyD4     9:47pm            4      4  w
     brent    ttyp0    26Jun91  4:46  26:46   4:41  bash
     dave     ttyq4    26Jun9115days     46     46  wnewmail

   The following program takes this input, converts the idle time to
number of seconds, and prints out the first two fields and the
calculated idle time:

     BEGIN  { FIELDWIDTHS = "9 6 10 6 7 7 35" }
     NR > 2 {
         idle = $4
         sub(/^ +/, "", idle)   # strip leading spaces
         if (idle == "")
             idle = 0
         if (idle ~ /:/) {
             split(idle, t, ":")
             idle = t[1] * 60 + t[2]
         }
         if (idle ~ /days/)
             idle *= 24 * 60 * 60

         print $1, $2, idle
     }

     NOTE: The preceding program uses a number of 'awk' features that
     haven't been introduced yet.

   Running the program on the data produces the following results:

     hzuo      ttyV0  0
     hzang     ttyV3  50
     eklye     ttyV5  0
     dportein  ttyV6  107
     gierd     ttyD3  1
     dave      ttyD4  0
     brent     ttyp0  286
     dave      ttyq4  1296000

   Another (possibly more practical) example of fixed-width input data
is the input from a deck of balloting cards.  In some parts of the
United States, voters mark their choices by punching holes in computer
cards.  These cards are then processed to count the votes for any
particular candidate or on any particular issue.  Because a voter may
choose not to vote on some issue, any column on the card may be empty.
An 'awk' program for processing such data could use the 'FIELDWIDTHS'
feature to simplify reading the data.  (Of course, getting 'gawk' to run
on a system with card readers is another story!)

   Assigning a value to 'FS' causes 'gawk' to use 'FS' for field
splitting again.  Use 'FS = FS' to make this happen, without having to
know the current value of 'FS'.  In order to tell which kind of field
splitting is in effect, use 'PROCINFO["FS"]' (*note Auto-set::).  The
value is '"FS"' if regular field splitting is being used, or
'"FIELDWIDTHS"' if fixed-width field splitting is being used:

     if (PROCINFO["FS"] == "FS")
         REGULAR FIELD SPLITTING ...
     else if  (PROCINFO["FS"] == "FIELDWIDTHS")
         FIXED-WIDTH FIELD SPLITTING ...
     else
         CONTENT-BASED FIELD SPLITTING ... (see next minor node)

   This information is useful when writing a function that needs to
temporarily change 'FS' or 'FIELDWIDTHS', read some records, and then
restore the original settings (*note Passwd Functions:: for an example
of such a function).


File: gawk.info,  Node: Splitting By Content,  Next: Multiple Line,  Prev: Constant Size,  Up: Reading Files

4.7 Defining Fields by Content
==============================

This minor node discusses an advanced feature of 'gawk'.  If you are a
novice 'awk' user, you might want to skip it on the first reading.

   Normally, when using 'FS', 'gawk' defines the fields as the parts of
the record that occur in between each field separator.  In other words,
'FS' defines what a field _is not_, instead of what a field _is_.
However, there are times when you really want to define the fields by
what they are, and not by what they are not.

   The most notorious such case is so-called "comma-separated values"
(CSV) data.  Many spreadsheet programs, for example, can export their
data into text files, where each record is terminated with a newline,
and fields are separated by commas.  If commas only separated the data,
there wouldn't be an issue.  The problem comes when one of the fields
contains an _embedded_ comma.  In such cases, most programs embed the
field in double quotes.(1)  So, we might have data like this:

     Robbins,Arnold,"1234 A Pretty Street, NE",MyTown,MyState,12345-6789,USA

   The 'FPAT' variable offers a solution for cases like this.  The value
of 'FPAT' should be a string that provides a regular expression.  This
regular expression describes the contents of each field.

   In the case of CSV data as presented here, each field is either
"anything that is not a comma," or "a double quote, anything that is not
a double quote, and a closing double quote."  If written as a regular
expression constant (*note Regexp::), we would have
'/([^,]+)|("[^"]+")/'.  Writing this as a string requires us to escape
the double quotes, leading to:

     FPAT = "([^,]+)|(\"[^\"]+\")"

   Putting this to use, here is a simple program to parse the data:

     BEGIN {
         FPAT = "([^,]+)|(\"[^\"]+\")"
     }

     {
         print "NF = ", NF
         for (i = 1; i <= NF; i++) {
             printf("$%d = <%s>\n", i, $i)
         }
     }

   When run, we get the following:

     $ gawk -f simple-csv.awk addresses.csv
     NF =  7
     $1 = <Robbins>
     $2 = <Arnold>
     $3 = <"1234 A Pretty Street, NE">
     $4 = <MyTown>
     $5 = <MyState>
     $6 = <12345-6789>
     $7 = <USA>

   Note the embedded comma in the value of '$3'.

   A straightforward improvement when processing CSV data of this sort
would be to remove the quotes when they occur, with something like this:

     if (substr($i, 1, 1) == "\"") {
         len = length($i)
         $i = substr($i, 2, len - 2)    # Get text within the two quotes
     }

   As with 'FS', the 'IGNORECASE' variable (*note User-modified::)
affects field splitting with 'FPAT'.

   Assigning a value to 'FPAT' overrides field splitting with 'FS' and
with 'FIELDWIDTHS'.  Similar to 'FIELDWIDTHS', the value of
'PROCINFO["FS"]' will be '"FPAT"' if content-based field splitting is
being used.

     NOTE: Some programs export CSV data that contains embedded newlines
     between the double quotes.  'gawk' provides no way to deal with
     this.  Even though a formal specification for CSV data exists,
     there isn't much more to be done; the 'FPAT' mechanism provides an
     elegant solution for the majority of cases, and the 'gawk'
     developers are satisfied with that.

   As written, the regexp used for 'FPAT' requires that each field
contain at least one character.  A straightforward modification
(changing the first '+' to '*') allows fields to be empty:

     FPAT = "([^,]*)|(\"[^\"]+\")"

   Finally, the 'patsplit()' function makes the same functionality
available for splitting regular strings (*note String Functions::).

   To recap, 'gawk' provides three independent methods to split input
records into fields.  The mechanism used is based on which of the three
variables--'FS', 'FIELDWIDTHS', or 'FPAT'--was last assigned to.

   ---------- Footnotes ----------

   (1) The CSV format lacked a formal standard definition for many
years.  RFC 4180 (http://www.ietf.org/rfc/rfc4180.txt) standardizes the
most common practices.


File: gawk.info,  Node: Multiple Line,  Next: Getline,  Prev: Splitting By Content,  Up: Reading Files

4.8 Multiple-Line Records
=========================

In some databases, a single line cannot conveniently hold all the
information in one entry.  In such cases, you can use multiline records.
The first step in doing this is to choose your data format.

   One technique is to use an unusual character or string to separate
records.  For example, you could use the formfeed character (written
'\f' in 'awk', as in C) to separate them, making each record a page of
the file.  To do this, just set the variable 'RS' to '"\f"' (a string
containing the formfeed character).  Any other character could equally
well be used, as long as it won't be part of the data in a record.

   Another technique is to have blank lines separate records.  By a
special dispensation, an empty string as the value of 'RS' indicates
that records are separated by one or more blank lines.  When 'RS' is set
to the empty string, each record always ends at the first blank line
encountered.  The next record doesn't start until the first nonblank
line that follows.  No matter how many blank lines appear in a row, they
all act as one record separator.  (Blank lines must be completely empty;
lines that contain only whitespace do not count.)

   You can achieve the same effect as 'RS = ""' by assigning the string
'"\n\n+"' to 'RS'.  This regexp matches the newline at the end of the
record and one or more blank lines after the record.  In addition, a
regular expression always matches the longest possible sequence when
there is a choice (*note Leftmost Longest::).  So, the next record
doesn't start until the first nonblank line that follows--no matter how
many blank lines appear in a row, they are considered one record
separator.

   However, there is an important difference between 'RS = ""' and 'RS =
"\n\n+"'.  In the first case, leading newlines in the input data file
are ignored, and if a file ends without extra blank lines after the last
record, the final newline is removed from the record.  In the second
case, this special processing is not done.  (d.c.)

   Now that the input is separated into records, the second step is to
separate the fields in the records.  One way to do this is to divide
each of the lines into fields in the normal manner.  This happens by
default as the result of a special feature.  When 'RS' is set to the
empty string _and_ 'FS' is set to a single character, the newline
character _always_ acts as a field separator.  This is in addition to
whatever field separations result from 'FS'.(1)

   The original motivation for this special exception was probably to
provide useful behavior in the default case (i.e., 'FS' is equal to
'" "').  This feature can be a problem if you really don't want the
newline character to separate fields, because there is no way to prevent
it.  However, you can work around this by using the 'split()' function
to break up the record manually (*note String Functions::).  If you have
a single-character field separator, you can work around the special
feature in a different way, by making 'FS' into a regexp for that single
character.  For example, if the field separator is a percent character,
instead of 'FS = "%"', use 'FS = "[%]"'.

   Another way to separate fields is to put each field on a separate
line: to do this, just set the variable 'FS' to the string '"\n"'.
(This single-character separator matches a single newline.)  A practical
example of a data file organized this way might be a mailing list, where
blank lines separate the entries.  Consider a mailing list in a file
named 'addresses', which looks like this:

     Jane Doe
     123 Main Street
     Anywhere, SE 12345-6789

     John Smith
     456 Tree-lined Avenue
     Smallville, MW 98765-4321
     ...

A simple program to process this file is as follows:

     # addrs.awk --- simple mailing list program

     # Records are separated by blank lines.
     # Each line is one field.
     BEGIN { RS = "" ; FS = "\n" }

     {
           print "Name is:", $1
           print "Address is:", $2
           print "City and State are:", $3
           print ""
     }

   Running the program produces the following output:

     $ awk -f addrs.awk addresses
     -| Name is: Jane Doe
     -| Address is: 123 Main Street
     -| City and State are: Anywhere, SE 12345-6789
     -|
     -| Name is: John Smith
     -| Address is: 456 Tree-lined Avenue
     -| City and State are: Smallville, MW 98765-4321
     -|
     ...

   *Note Labels Program:: for a more realistic program dealing with
address lists.  The following list summarizes how records are split,
based on the value of 'RS'.  ('==' means "is equal to.")

'RS == "\n"'
     Records are separated by the newline character ('\n').  In effect,
     every line in the data file is a separate record, including blank
     lines.  This is the default.

'RS == ANY SINGLE CHARACTER'
     Records are separated by each occurrence of the character.
     Multiple successive occurrences delimit empty records.

'RS == ""'
     Records are separated by runs of blank lines.  When 'FS' is a
     single character, then the newline character always serves as a
     field separator, in addition to whatever value 'FS' may have.
     Leading and trailing newlines in a file are ignored.

'RS == REGEXP'
     Records are separated by occurrences of characters that match
     REGEXP.  Leading and trailing matches of REGEXP delimit empty
     records.  (This is a 'gawk' extension; it is not specified by the
     POSIX standard.)

   If not in compatibility mode (*note Options::), 'gawk' sets 'RT' to
the input text that matched the value specified by 'RS'.  But if the
input file ended without any text that matches 'RS', then 'gawk' sets
'RT' to the null string.

   ---------- Footnotes ----------

   (1) When 'FS' is the null string ('""') or a regexp, this special
feature of 'RS' does not apply.  It does apply to the default field
separator of a single space: 'FS = " "'.


File: gawk.info,  Node: Getline,  Next: Read Timeout,  Prev: Multiple Line,  Up: Reading Files

4.9 Explicit Input with 'getline'
=================================

So far we have been getting our input data from 'awk''s main input
stream--either the standard input (usually your keyboard, sometimes the
output from another program) or the files specified on the command line.
The 'awk' language has a special built-in command called 'getline' that
can be used to read input under your explicit control.

   The 'getline' command is used in several different ways and should
_not_ be used by beginners.  The examples that follow the explanation of
the 'getline' command include material that has not been covered yet.
Therefore, come back and study the 'getline' command _after_ you have
reviewed the rest of this Info file and have a good knowledge of how
'awk' works.

   The 'getline' command returns 1 if it finds a record and 0 if it
encounters the end of the file.  If there is some error in getting a
record, such as a file that cannot be opened, then 'getline' returns -1.
In this case, 'gawk' sets the variable 'ERRNO' to a string describing
the error that occurred.

   In the following examples, COMMAND stands for a string value that
represents a shell command.

     NOTE: When '--sandbox' is specified (*note Options::), reading
     lines from files, pipes, and coprocesses is disabled.

* Menu:

* Plain Getline::               Using 'getline' with no arguments.
* Getline/Variable::            Using 'getline' into a variable.
* Getline/File::                Using 'getline' from a file.
* Getline/Variable/File::       Using 'getline' into a variable from a
                                file.
* Getline/Pipe::                Using 'getline' from a pipe.
* Getline/Variable/Pipe::       Using 'getline' into a variable from a
                                pipe.
* Getline/Coprocess::           Using 'getline' from a coprocess.
* Getline/Variable/Coprocess::  Using 'getline' into a variable from a
                                coprocess.
* Getline Notes::               Important things to know about 'getline'.
* Getline Summary::             Summary of 'getline' Variants.


File: gawk.info,  Node: Plain Getline,  Next: Getline/Variable,  Up: Getline

4.9.1 Using 'getline' with No Arguments
---------------------------------------

The 'getline' command can be used without arguments to read input from
the current input file.  All it does in this case is read the next input
record and split it up into fields.  This is useful if you've finished
processing the current record, but want to do some special processing on
the next record _right now_.  For example:

     # Remove text between /* and */, inclusive
     {
         if ((i = index($0, "/*")) != 0) {
             out = substr($0, 1, i - 1)  # leading part of the string
             rest = substr($0, i + 2)    # ... */ ...
             j = index(rest, "*/")       # is */ in trailing part?
             if (j > 0) {
                 rest = substr(rest, j + 2)  # remove comment
             } else {
                 while (j == 0) {
                     # get more text
                     if (getline <= 0) {
                         print("unexpected EOF or error:", ERRNO) > "/dev/stderr"
                         exit
                     }
                     # build up the line using string concatenation
                     rest = rest $0
                     j = index(rest, "*/")   # is */ in trailing part?
                     if (j != 0) {
                         rest = substr(rest, j + 2)
                         break
                     }
                 }
             }
             # build up the output line using string concatenation
             $0 = out rest
         }
         print $0
     }

   This 'awk' program deletes C-style comments ('/* ... */') from the
input.  It uses a number of features we haven't covered yet, including
string concatenation (*note Concatenation::) and the 'index()' and
'substr()' built-in functions (*note String Functions::).  By replacing
the 'print $0' with other statements, you could perform more complicated
processing on the decommented input, such as searching for matches of a
regular expression.  (This program has a subtle problem--it does not
work if one comment ends and another begins on the same line.)

   This form of the 'getline' command sets 'NF', 'NR', 'FNR', 'RT', and
the value of '$0'.

     NOTE: The new value of '$0' is used to test the patterns of any
     subsequent rules.  The original value of '$0' that triggered the
     rule that executed 'getline' is lost.  By contrast, the 'next'
     statement reads a new record but immediately begins processing it
     normally, starting with the first rule in the program.  *Note Next
     Statement::.


File: gawk.info,  Node: Getline/Variable,  Next: Getline/File,  Prev: Plain Getline,  Up: Getline

4.9.2 Using 'getline' into a Variable
-------------------------------------

You can use 'getline VAR' to read the next record from 'awk''s input
into the variable VAR.  No other processing is done.  For example,
suppose the next line is a comment or a special string, and you want to
read it without triggering any rules.  This form of 'getline' allows you
to read that line and store it in a variable so that the main
read-a-line-and-check-each-rule loop of 'awk' never sees it.  The
following example swaps every two lines of input:

     {
          if ((getline tmp) > 0) {
               print tmp
               print $0
          } else
               print $0
     }

It takes the following list:

     wan
     tew
     free
     phore

and produces these results:

     tew
     wan
     phore
     free

   The 'getline' command used in this way sets only the variables 'NR',
'FNR', and 'RT' (and, of course, VAR).  The record is not split into
fields, so the values of the fields (including '$0') and the value of
'NF' do not change.


File: gawk.info,  Node: Getline/File,  Next: Getline/Variable/File,  Prev: Getline/Variable,  Up: Getline

4.9.3 Using 'getline' from a File
---------------------------------

Use 'getline < FILE' to read the next record from FILE.  Here, FILE is a
string-valued expression that specifies the file name.  '< FILE' is
called a "redirection" because it directs input to come from a different
place.  For example, the following program reads its input record from
the file 'secondary.input' when it encounters a first field with a value
equal to 10 in the current input file:

     {
         if ($1 == 10) {
              getline < "secondary.input"
              print
         } else
              print
     }

   Because the main input stream is not used, the values of 'NR' and
'FNR' are not changed.  However, the record it reads is split into
fields in the normal manner, so the values of '$0' and the other fields
are changed, resulting in a new value of 'NF'.  'RT' is also set.

   According to POSIX, 'getline < EXPRESSION' is ambiguous if EXPRESSION
contains unparenthesized operators other than '$'; for example, 'getline
< dir "/" file' is ambiguous because the concatenation operator (not
discussed yet; *note Concatenation::) is not parenthesized.  You should
write it as 'getline < (dir "/" file)' if you want your program to be
portable to all 'awk' implementations.


File: gawk.info,  Node: Getline/Variable/File,  Next: Getline/Pipe,  Prev: Getline/File,  Up: Getline

4.9.4 Using 'getline' into a Variable from a File
-------------------------------------------------

Use 'getline VAR < FILE' to read input from the file FILE, and put it in
the variable VAR.  As earlier, FILE is a string-valued expression that
specifies the file from which to read.

   In this version of 'getline', none of the predefined variables are
changed and the record is not split into fields.  The only variable
changed is VAR.(1)  For example, the following program copies all the
input files to the output, except for records that say
'@include FILENAME'.  Such a record is replaced by the contents of the
file FILENAME:

     {
          if (NF == 2 && $1 == "@include") {
               while ((getline line < $2) > 0)
                    print line
               close($2)
          } else
               print
     }

   Note here how the name of the extra input file is not built into the
program; it is taken directly from the data, specifically from the
second field on the '@include' line.

   The 'close()' function is called to ensure that if two identical
'@include' lines appear in the input, the entire specified file is
included twice.  *Note Close Files And Pipes::.

   One deficiency of this program is that it does not process nested
'@include' statements (i.e., '@include' statements in included files)
the way a true macro preprocessor would.  *Note Igawk Program:: for a
program that does handle nested '@include' statements.

   ---------- Footnotes ----------

   (1) This is not quite true.  'RT' could be changed if 'RS' is a
regular expression.


File: gawk.info,  Node: Getline/Pipe,  Next: Getline/Variable/Pipe,  Prev: Getline/Variable/File,  Up: Getline

4.9.5 Using 'getline' from a Pipe
---------------------------------

     Omniscience has much to recommend it.  Failing that, attention to
     details would be useful.
                         -- _Brian Kernighan_

   The output of a command can also be piped into 'getline', using
'COMMAND | getline'.  In this case, the string COMMAND is run as a shell
command and its output is piped into 'awk' to be used as input.  This
form of 'getline' reads one record at a time from the pipe.  For
example, the following program copies its input to its output, except
for lines that begin with '@execute', which are replaced by the output
produced by running the rest of the line as a shell command:

     {
          if ($1 == "@execute") {
               tmp = substr($0, 10)        # Remove "@execute"
               while ((tmp | getline) > 0)
                    print
               close(tmp)
          } else
               print
     }

The 'close()' function is called to ensure that if two identical
'@execute' lines appear in the input, the command is run for each one.
*Note Close Files And Pipes::.  Given the input:

     foo
     bar
     baz
     @execute who
     bletch

the program might produce:

     foo
     bar
     baz
     arnold     ttyv0   Jul 13 14:22
     miriam     ttyp0   Jul 13 14:23     (murphy:0)
     bill       ttyp1   Jul 13 14:23     (murphy:0)
     bletch

Notice that this program ran the command 'who' and printed the result.
(If you try this program yourself, you will of course get different
results, depending upon who is logged in on your system.)

   This variation of 'getline' splits the record into fields, sets the
value of 'NF', and recomputes the value of '$0'.  The values of 'NR' and
'FNR' are not changed.  'RT' is set.

   According to POSIX, 'EXPRESSION | getline' is ambiguous if EXPRESSION
contains unparenthesized operators other than '$'--for example, '"echo "
"date" | getline' is ambiguous because the concatenation operator is not
parenthesized.  You should write it as '("echo " "date") | getline' if
you want your program to be portable to all 'awk' implementations.

     NOTE: Unfortunately, 'gawk' has not been consistent in its
     treatment of a construct like '"echo " "date" | getline'.  Most
     versions, including the current version, treat it at as '("echo "
     "date") | getline'.  (This is also how BWK 'awk' behaves.)  Some
     versions instead treat it as '"echo " ("date" | getline)'.  (This
     is how 'mawk' behaves.)  In short, _always_ use explicit
     parentheses, and then you won't have to worry.


File: gawk.info,  Node: Getline/Variable/Pipe,  Next: Getline/Coprocess,  Prev: Getline/Pipe,  Up: Getline

4.9.6 Using 'getline' into a Variable from a Pipe
-------------------------------------------------

When you use 'COMMAND | getline VAR', the output of COMMAND is sent
through a pipe to 'getline' and into the variable VAR.  For example, the
following program reads the current date and time into the variable
'current_time', using the 'date' utility, and then prints it:

     BEGIN {
          "date" | getline current_time
          close("date")
          print "Report printed on " current_time
     }

   In this version of 'getline', none of the predefined variables are
changed and the record is not split into fields.  However, 'RT' is set.

   According to POSIX, 'EXPRESSION | getline VAR' is ambiguous if
EXPRESSION contains unparenthesized operators other than '$'; for
example, '"echo " "date" | getline VAR' is ambiguous because the
concatenation operator is not parenthesized.  You should write it as
'("echo " "date") | getline VAR' if you want your program to be portable
to other 'awk' implementations.


File: gawk.info,  Node: Getline/Coprocess,  Next: Getline/Variable/Coprocess,  Prev: Getline/Variable/Pipe,  Up: Getline

4.9.7 Using 'getline' from a Coprocess
--------------------------------------

Reading input into 'getline' from a pipe is a one-way operation.  The
command that is started with 'COMMAND | getline' only sends data _to_
your 'awk' program.

   On occasion, you might want to send data to another program for
processing and then read the results back.  'gawk' allows you to start a
"coprocess", with which two-way communications are possible.  This is
done with the '|&' operator.  Typically, you write data to the coprocess
first and then read the results back, as shown in the following:

     print "SOME QUERY" |& "db_server"
     "db_server" |& getline

which sends a query to 'db_server' and then reads the results.

   The values of 'NR' and 'FNR' are not changed, because the main input
stream is not used.  However, the record is split into fields in the
normal manner, thus changing the values of '$0', of the other fields,
and of 'NF' and 'RT'.

   Coprocesses are an advanced feature.  They are discussed here only
because this is the minor node on 'getline'.  *Note Two-way I/O::, where
coprocesses are discussed in more detail.


File: gawk.info,  Node: Getline/Variable/Coprocess,  Next: Getline Notes,  Prev: Getline/Coprocess,  Up: Getline

4.9.8 Using 'getline' into a Variable from a Coprocess
------------------------------------------------------

When you use 'COMMAND |& getline VAR', the output from the coprocess
COMMAND is sent through a two-way pipe to 'getline' and into the
variable VAR.

   In this version of 'getline', none of the predefined variables are
changed and the record is not split into fields.  The only variable
changed is VAR.  However, 'RT' is set.

   Coprocesses are an advanced feature.  They are discussed here only
because this is the minor node on 'getline'.  *Note Two-way I/O::, where
coprocesses are discussed in more detail.


File: gawk.info,  Node: Getline Notes,  Next: Getline Summary,  Prev: Getline/Variable/Coprocess,  Up: Getline

4.9.9 Points to Remember About 'getline'
----------------------------------------

Here are some miscellaneous points about 'getline' that you should bear
in mind:

   * When 'getline' changes the value of '$0' and 'NF', 'awk' does _not_
     automatically jump to the start of the program and start testing
     the new record against every pattern.  However, the new record is
     tested against any subsequent rules.

   * Some very old 'awk' implementations limit the number of pipelines
     that an 'awk' program may have open to just one.  In 'gawk', there
     is no such limit.  You can open as many pipelines (and coprocesses)
     as the underlying operating system permits.

   * An interesting side effect occurs if you use 'getline' without a
     redirection inside a 'BEGIN' rule.  Because an unredirected
     'getline' reads from the command-line data files, the first
     'getline' command causes 'awk' to set the value of 'FILENAME'.
     Normally, 'FILENAME' does not have a value inside 'BEGIN' rules,
     because you have not yet started to process the command-line data
     files.  (d.c.)  (See *note BEGIN/END::; also *note Auto-set::.)

   * Using 'FILENAME' with 'getline' ('getline < FILENAME') is likely to
     be a source of confusion.  'awk' opens a separate input stream from
     the current input file.  However, by not using a variable, '$0' and
     'NF' are still updated.  If you're doing this, it's probably by
     accident, and you should reconsider what it is you're trying to
     accomplish.

   * *note Getline Summary::, presents a table summarizing the 'getline'
     variants and which variables they can affect.  It is worth noting
     that those variants that do not use redirection can cause
     'FILENAME' to be updated if they cause 'awk' to start reading a new
     input file.

   * If the variable being assigned is an expression with side effects,
     different versions of 'awk' behave differently upon encountering
     end-of-file.  Some versions don't evaluate the expression; many
     versions (including 'gawk') do.  Here is an example, courtesy of
     Duncan Moore:

          BEGIN {
              system("echo 1 > f")
              while ((getline a[++c] < "f") > 0) { }
              print c
          }

     Here, the side effect is the '++c'.  Is 'c' incremented if
     end-of-file is encountered before the element in 'a' is assigned?

     'gawk' treats 'getline' like a function call, and evaluates the
     expression 'a[++c]' before attempting to read from 'f'.  However,
     some versions of 'awk' only evaluate the expression once they know
     that there is a string value to be assigned.


File: gawk.info,  Node: Getline Summary,  Prev: Getline Notes,  Up: Getline

4.9.10 Summary of 'getline' Variants
------------------------------------

*note Table 4.1: table-getline-variants. summarizes the eight variants
of 'getline', listing which predefined variables are set by each one,
and whether the variant is standard or a 'gawk' extension.  Note: for
each variant, 'gawk' sets the 'RT' predefined variable.

Variant                  Effect                      'awk' / 'gawk'
-------------------------------------------------------------------------
'getline'                Sets '$0', 'NF', 'FNR',     'awk'
                         'NR', and 'RT'
'getline' VAR            Sets VAR, 'FNR', 'NR',      'awk'
                         and 'RT'
'getline <' FILE         Sets '$0', 'NF', and 'RT'   'awk'
'getline VAR < FILE'     Sets VAR and 'RT'           'awk'
COMMAND '| getline'      Sets '$0', 'NF', and 'RT'   'awk'
COMMAND '| getline'      Sets VAR and 'RT'           'awk'
VAR
COMMAND '|& getline'     Sets '$0', 'NF', and 'RT'   'gawk'
COMMAND '|& getline'     Sets VAR and 'RT'           'gawk'
VAR

Table 4.1: 'getline' variants and what they set


File: gawk.info,  Node: Read Timeout,  Next: Command-line directories,  Prev: Getline,  Up: Reading Files

4.10 Reading Input with a Timeout
=================================

This minor node describes a feature that is specific to 'gawk'.

   You may specify a timeout in milliseconds for reading input from the
keyboard, a pipe, or two-way communication, including TCP/IP sockets.
This can be done on a per-input, per-command, or per-connection basis,
by setting a special element in the 'PROCINFO' array (*note Auto-set::):

     PROCINFO["input_name", "READ_TIMEOUT"] = TIMEOUT IN MILLISECONDS

   When set, this causes 'gawk' to time out and return failure if no
data is available to read within the specified timeout period.  For
example, a TCP client can decide to give up on receiving any response
from the server after a certain amount of time:

     Service = "/inet/tcp/0/localhost/daytime"
     PROCINFO[Service, "READ_TIMEOUT"] = 100
     if ((Service |& getline) > 0)
         print $0
     else if (ERRNO != "")
         print ERRNO

   Here is how to read interactively from the user(1) without waiting
for more than five seconds:

     PROCINFO["/dev/stdin", "READ_TIMEOUT"] = 5000
     while ((getline < "/dev/stdin") > 0)
         print $0

   'gawk' terminates the read operation if input does not arrive after
waiting for the timeout period, returns failure, and sets 'ERRNO' to an
appropriate string value.  A negative or zero value for the timeout is
the same as specifying no timeout at all.

   A timeout can also be set for reading from the keyboard in the
implicit loop that reads input records and matches them against
patterns, like so:

     $ gawk 'BEGIN { PROCINFO["-", "READ_TIMEOUT"] = 5000 }
     > { print "You entered: " $0 }'
     gawk
     -| You entered: gawk

   In this case, failure to respond within five seconds results in the
following error message:

     error-> gawk: cmd. line:2: (FILENAME=- FNR=1) fatal: error reading input file `-': Connection timed out

   The timeout can be set or changed at any time, and will take effect
on the next attempt to read from the input device.  In the following
example, we start with a timeout value of one second, and progressively
reduce it by one-tenth of a second until we wait indefinitely for the
input to arrive:

     PROCINFO[Service, "READ_TIMEOUT"] = 1000
     while ((Service |& getline) > 0) {
         print $0
         PROCINFO[Service, "READ_TIMEOUT"] -= 100
     }

     NOTE: You should not assume that the read operation will block
     exactly after the tenth record has been printed.  It is possible
     that 'gawk' will read and buffer more than one record's worth of
     data the first time.  Because of this, changing the value of
     timeout like in the preceding example is not very useful.

   If the 'PROCINFO' element is not present and the 'GAWK_READ_TIMEOUT'
environment variable exists, 'gawk' uses its value to initialize the
timeout value.  The exclusive use of the environment variable to specify
timeout has the disadvantage of not being able to control it on a
per-command or per-connection basis.

   'gawk' considers a timeout event to be an error even though the
attempt to read from the underlying device may succeed in a later
attempt.  This is a limitation, and it also means that you cannot use
this to multiplex input from two or more sources.

   Assigning a timeout value prevents read operations from blocking
indefinitely.  But bear in mind that there are other ways 'gawk' can
stall waiting for an input device to be ready.  A network client can
sometimes take a long time to establish a connection before it can start
reading any data, or the attempt to open a FIFO special file for reading
can block indefinitely until some other process opens it for writing.

   ---------- Footnotes ----------

   (1) This assumes that standard input is the keyboard.


File: gawk.info,  Node: Command-line directories,  Next: Input Summary,  Prev: Read Timeout,  Up: Reading Files

4.11 Directories on the Command Line
====================================

According to the POSIX standard, files named on the 'awk' command line
must be text files; it is a fatal error if they are not.  Most versions
of 'awk' treat a directory on the command line as a fatal error.

   By default, 'gawk' produces a warning for a directory on the command
line, but otherwise ignores it.  This makes it easier to use shell
wildcards with your 'awk' program:

     $ gawk -f whizprog.awk *        Directories could kill this program

   If either of the '--posix' or '--traditional' options is given, then
'gawk' reverts to treating a directory on the command line as a fatal
error.

   *Note Extension Sample Readdir:: for a way to treat directories as
usable data from an 'awk' program.


File: gawk.info,  Node: Input Summary,  Next: Input Exercises,  Prev: Command-line directories,  Up: Reading Files

4.12 Summary
============

   * Input is split into records based on the value of 'RS'.  The
     possibilities are as follows:

     Value of 'RS'      Records are split on      'awk' / 'gawk'
                        ...
     ---------------------------------------------------------------------------
     Any single         That character            'awk'
     character
     The empty string   Runs of two or more       'awk'
     ('""')             newlines
     A regexp           Text that matches the     'gawk'
                        regexp

   * 'FNR' indicates how many records have been read from the current
     input file; 'NR' indicates how many records have been read in
     total.

   * 'gawk' sets 'RT' to the text matched by 'RS'.

   * After splitting the input into records, 'awk' further splits the
     records into individual fields, named '$1', '$2', and so on.  '$0'
     is the whole record, and 'NF' indicates how many fields there are.
     The default way to split fields is between whitespace characters.

   * Fields may be referenced using a variable, as in '$NF'.  Fields may
     also be assigned values, which causes the value of '$0' to be
     recomputed when it is later referenced.  Assigning to a field with
     a number greater than 'NF' creates the field and rebuilds the
     record, using 'OFS' to separate the fields.  Incrementing 'NF' does
     the same thing.  Decrementing 'NF' throws away fields and rebuilds
     the record.

   * Field splitting is more complicated than record splitting:

     Field separator value         Fields are split ...          'awk' /
                                                                 'gawk'
     ---------------------------------------------------------------------------
     'FS == " "'                   On runs of whitespace         'awk'
     'FS == ANY SINGLE             On that character             'awk'
     CHARACTER'
     'FS == REGEXP'                On text matching the regexp   'awk'
     'FS == ""'                    Such that each individual     'gawk'
                                   character is a separate
                                   field
     'FIELDWIDTHS == LIST OF       Based on character position   'gawk'
     COLUMNS'
     'FPAT == REGEXP'              On the text surrounding       'gawk'
                                   text matching the regexp

   * Using 'FS = "\n"' causes the entire record to be a single field
     (assuming that newlines separate records).

   * 'FS' may be set from the command line using the '-F' option.  This
     can also be done using command-line variable assignment.

   * Use 'PROCINFO["FS"]' to see how fields are being split.

   * Use 'getline' in its various forms to read additional records from
     the default input stream, from a file, or from a pipe or coprocess.

   * Use 'PROCINFO[FILE, "READ_TIMEOUT"]' to cause reads to time out for
     FILE.

   * Directories on the command line are fatal for standard 'awk';
     'gawk' ignores them if not in POSIX mode.


File: gawk.info,  Node: Input Exercises,  Prev: Input Summary,  Up: Reading Files

4.13 Exercises
==============

  1. Using the 'FIELDWIDTHS' variable (*note Constant Size::), write a
     program to read election data, where each record represents one
     voter's votes.  Come up with a way to define which columns are
     associated with each ballot item, and print the total votes,
     including abstentions, for each item.

  2. *note Plain Getline::, presented a program to remove C-style
     comments ('/* ... */') from the input.  That program does not work
     if one comment ends on one line and another one starts later on the
     same line.  That can be fixed by making one simple change.  What is
     it?


File: gawk.info,  Node: Printing,  Next: Expressions,  Prev: Reading Files,  Up: Top

5 Printing Output
*****************

One of the most common programming actions is to "print", or output,
some or all of the input.  Use the 'print' statement for simple output,
and the 'printf' statement for fancier formatting.  The 'print'
statement is not limited when computing _which_ values to print.
However, with two exceptions, you cannot specify _how_ to print
them--how many columns, whether to use exponential notation or not, and
so on.  (For the exceptions, *note Output Separators:: and *note
OFMT::.)  For printing with specifications, you need the 'printf'
statement (*note Printf::).

   Besides basic and formatted printing, this major node also covers I/O
redirections to files and pipes, introduces the special file names that
'gawk' processes internally, and discusses the 'close()' built-in
function.

* Menu:

* Print::                       The 'print' statement.
* Print Examples::              Simple examples of 'print' statements.
* Output Separators::           The output separators and how to change them.
* OFMT::                        Controlling Numeric Output With 'print'.
* Printf::                      The 'printf' statement.
* Redirection::                 How to redirect output to multiple files and
                                pipes.
* Special FD::                  Special files for I/O.
* Special Files::               File name interpretation in 'gawk'.
                                'gawk' allows access to inherited file
                                descriptors.
* Close Files And Pipes::       Closing Input and Output Files and Pipes.
* Output Summary::              Output summary.
* Output Exercises::            Exercises.


File: gawk.info,  Node: Print,  Next: Print Examples,  Up: Printing

5.1 The 'print' Statement
=========================

Use the 'print' statement to produce output with simple, standardized
formatting.  You specify only the strings or numbers to print, in a list
separated by commas.  They are output, separated by single spaces,
followed by a newline.  The statement looks like this:

     print ITEM1, ITEM2, ...

The entire list of items may be optionally enclosed in parentheses.  The
parentheses are necessary if any of the item expressions uses the '>'
relational operator; otherwise it could be confused with an output
redirection (*note Redirection::).

   The items to print can be constant strings or numbers, fields of the
current record (such as '$1'), variables, or any 'awk' expression.
Numeric values are converted to strings and then printed.

   The simple statement 'print' with no items is equivalent to 'print
$0': it prints the entire current record.  To print a blank line, use
'print ""'.  To print a fixed piece of text, use a string constant, such
as '"Don't Panic"', as one item.  If you forget to use the double-quote
characters, your text is taken as an 'awk' expression, and you will
probably get an error.  Keep in mind that a space is printed between any
two items.

   Note that the 'print' statement is a statement and not an
expression--you can't use it in the pattern part of a pattern-action
statement, for example.


File: gawk.info,  Node: Print Examples,  Next: Output Separators,  Prev: Print,  Up: Printing

5.2 'print' Statement Examples
==============================

Each 'print' statement makes at least one line of output.  However, it
isn't limited to only one line.  If an item value is a string containing
a newline, the newline is output along with the rest of the string.  A
single 'print' statement can make any number of lines this way.

   The following is an example of printing a string that contains
embedded newlines (the '\n' is an escape sequence, used to represent the
newline character; *note Escape Sequences::):

     $ awk 'BEGIN { print "line one\nline two\nline three" }'
     -| line one
     -| line two
     -| line three

   The next example, which is run on the 'inventory-shipped' file,
prints the first two fields of each input record, with a space between
them:

     $ awk '{ print $1, $2 }' inventory-shipped
     -| Jan 13
     -| Feb 15
     -| Mar 15
     ...

   A common mistake in using the 'print' statement is to omit the comma
between two items.  This often has the effect of making the items run
together in the output, with no space.  The reason for this is that
juxtaposing two string expressions in 'awk' means to concatenate them.
Here is the same program, without the comma:

     $ awk '{ print $1 $2 }' inventory-shipped
     -| Jan13
     -| Feb15
     -| Mar15
     ...

   To someone unfamiliar with the 'inventory-shipped' file, neither
example's output makes much sense.  A heading line at the beginning
would make it clearer.  Let's add some headings to our table of months
('$1') and green crates shipped ('$2').  We do this using a 'BEGIN' rule
(*note BEGIN/END::) so that the headings are only printed once:

     awk 'BEGIN {  print "Month Crates"
                   print "----- ------" }
                {  print $1, $2 }' inventory-shipped

When run, the program prints the following:

     Month Crates
     ----- ------
     Jan 13
     Feb 15
     Mar 15
     ...

The only problem, however, is that the headings and the table data don't
line up!  We can fix this by printing some spaces between the two
fields:

     awk 'BEGIN { print "Month Crates"
                  print "----- ------" }
                { print $1, "     ", $2 }' inventory-shipped

   Lining up columns this way can get pretty complicated when there are
many columns to fix.  Counting spaces for two or three columns is
simple, but any more than this can take up a lot of time.  This is why
the 'printf' statement was created (*note Printf::); one of its
specialties is lining up columns of data.

     NOTE: You can continue either a 'print' or 'printf' statement
     simply by putting a newline after any comma (*note
     Statements/Lines::).


File: gawk.info,  Node: Output Separators,  Next: OFMT,  Prev: Print Examples,  Up: Printing

5.3 Output Separators
=====================

As mentioned previously, a 'print' statement contains a list of items
separated by commas.  In the output, the items are normally separated by
single spaces.  However, this doesn't need to be the case; a single
space is simply the default.  Any string of characters may be used as
the "output field separator" by setting the predefined variable 'OFS'.
The initial value of this variable is the string '" "' (i.e., a single
space).

   The output from an entire 'print' statement is called an "output
record".  Each 'print' statement outputs one output record, and then
outputs a string called the "output record separator" (or 'ORS').  The
initial value of 'ORS' is the string '"\n"' (i.e., a newline character).
Thus, each 'print' statement normally makes a separate line.

   In order to change how output fields and records are separated,
assign new values to the variables 'OFS' and 'ORS'.  The usual place to
do this is in the 'BEGIN' rule (*note BEGIN/END::), so that it happens
before any input is processed.  It can also be done with assignments on
the command line, before the names of the input files, or using the '-v'
command-line option (*note Options::).  The following example prints the
first and second fields of each input record, separated by a semicolon,
with a blank line added after each newline:

     $ awk 'BEGIN { OFS = ";"; ORS = "\n\n" }
     >            { print $1, $2 }' mail-list
     -| Amelia;555-5553
     -|
     -| Anthony;555-3412
     -|
     -| Becky;555-7685
     -|
     -| Bill;555-1675
     -|
     -| Broderick;555-0542
     -|
     -| Camilla;555-2912
     -|
     -| Fabius;555-1234
     -|
     -| Julie;555-6699
     -|
     -| Martin;555-6480
     -|
     -| Samuel;555-3430
     -|
     -| Jean-Paul;555-2127
     -|

   If the value of 'ORS' does not contain a newline, the program's
output runs together on a single line.


File: gawk.info,  Node: OFMT,  Next: Printf,  Prev: Output Separators,  Up: Printing

5.4 Controlling Numeric Output with 'print'
===========================================

When printing numeric values with the 'print' statement, 'awk'
internally converts each number to a string of characters and prints
that string.  'awk' uses the 'sprintf()' function to do this conversion
(*note String Functions::).  For now, it suffices to say that the
'sprintf()' function accepts a "format specification" that tells it how
to format numbers (or strings), and that there are a number of different
ways in which numbers can be formatted.  The different format
specifications are discussed more fully in *note Control Letters::.

   The predefined variable 'OFMT' contains the format specification that
'print' uses with 'sprintf()' when it wants to convert a number to a
string for printing.  The default value of 'OFMT' is '"%.6g"'.  The way
'print' prints numbers can be changed by supplying a different format
specification for the value of 'OFMT', as shown in the following
example:

     $ awk 'BEGIN {
     >   OFMT = "%.0f"  # print numbers as integers (rounds)
     >   print 17.23, 17.54 }'
     -| 17 18

According to the POSIX standard, 'awk''s behavior is undefined if 'OFMT'
contains anything but a floating-point conversion specification.  (d.c.)


File: gawk.info,  Node: Printf,  Next: Redirection,  Prev: OFMT,  Up: Printing

5.5 Using 'printf' Statements for Fancier Printing
==================================================

For more precise control over the output format than what is provided by
'print', use 'printf'.  With 'printf' you can specify the width to use
for each item, as well as various formatting choices for numbers (such
as what output base to use, whether to print an exponent, whether to
print a sign, and how many digits to print after the decimal point).

* Menu:

* Basic Printf::                Syntax of the 'printf' statement.
* Control Letters::             Format-control letters.
* Format Modifiers::            Format-specification modifiers.
* Printf Examples::             Several examples.


File: gawk.info,  Node: Basic Printf,  Next: Control Letters,  Up: Printf

5.5.1 Introduction to the 'printf' Statement
--------------------------------------------

A simple 'printf' statement looks like this:

     printf FORMAT, ITEM1, ITEM2, ...

As for 'print', the entire list of arguments may optionally be enclosed
in parentheses.  Here too, the parentheses are necessary if any of the
item expressions uses the '>' relational operator; otherwise, it can be
confused with an output redirection (*note Redirection::).

   The difference between 'printf' and 'print' is the FORMAT argument.
This is an expression whose value is taken as a string; it specifies how
to output each of the other arguments.  It is called the "format
string".

   The format string is very similar to that in the ISO C library
function 'printf()'.  Most of FORMAT is text to output verbatim.
Scattered among this text are "format specifiers"--one per item.  Each
format specifier says to output the next item in the argument list at
that place in the format.

   The 'printf' statement does not automatically append a newline to its
output.  It outputs only what the format string specifies.  So if a
newline is needed, you must include one in the format string.  The
output separator variables 'OFS' and 'ORS' have no effect on 'printf'
statements.  For example:

     $ awk 'BEGIN {
     >    ORS = "\nOUCH!\n"; OFS = "+"
     >    msg = "Don\47t Panic!"
     >    printf "%s\n", msg
     > }'
     -| Don't Panic!

Here, neither the '+' nor the 'OUCH!' appears in the output message.


File: gawk.info,  Node: Control Letters,  Next: Format Modifiers,  Prev: Basic Printf,  Up: Printf

5.5.2 Format-Control Letters
----------------------------

A format specifier starts with the character '%' and ends with a
"format-control letter"--it tells the 'printf' statement how to output
one item.  The format-control letter specifies what _kind_ of value to
print.  The rest of the format specifier is made up of optional
"modifiers" that control _how_ to print the value, such as the field
width.  Here is a list of the format-control letters:

'%c'
     Print a number as a character; thus, 'printf "%c", 65' outputs the
     letter 'A'.  The output for a string value is the first character
     of the string.

          NOTE: The POSIX standard says the first character of a string
          is printed.  In locales with multibyte characters, 'gawk'
          attempts to convert the leading bytes of the string into a
          valid wide character and then to print the multibyte encoding
          of that character.  Similarly, when printing a numeric value,
          'gawk' allows the value to be within the numeric range of
          values that can be held in a wide character.  If the
          conversion to multibyte encoding fails, 'gawk' uses the low
          eight bits of the value as the character to print.

          Other 'awk' versions generally restrict themselves to printing
          the first byte of a string or to numeric values within the
          range of a single byte (0-255).

'%d', '%i'
     Print a decimal integer.  The two control letters are equivalent.
     (The '%i' specification is for compatibility with ISO C.)

'%e', '%E'
     Print a number in scientific (exponential) notation.  For example:

          printf "%4.3e\n", 1950

     prints '1.950e+03', with a total of four significant figures, three
     of which follow the decimal point.  (The '4.3' represents two
     modifiers, discussed in the next node.)  '%E' uses 'E' instead of
     'e' in the output.

'%f'
     Print a number in floating-point notation.  For example:

          printf "%4.3f", 1950

     prints '1950.000', with a total of four significant figures, three
     of which follow the decimal point.  (The '4.3' represents two
     modifiers, discussed in the next node.)

     On systems supporting IEEE 754 floating-point format, values
     representing negative infinity are formatted as '-inf' or
     '-infinity', and positive infinity as 'inf' or 'infinity'.  The
     special "not a number" value formats as '-nan' or 'nan' (*note Math
     Definitions::).

'%F'
     Like '%f', but the infinity and "not a number" values are spelled
     using uppercase letters.

     The '%F' format is a POSIX extension to ISO C; not all systems
     support it.  On those that don't, 'gawk' uses '%f' instead.

'%g', '%G'
     Print a number in either scientific notation or in floating-point
     notation, whichever uses fewer characters; if the result is printed
     in scientific notation, '%G' uses 'E' instead of 'e'.

'%o'
     Print an unsigned octal integer (*note Nondecimal-numbers::).

'%s'
     Print a string.

'%u'
     Print an unsigned decimal integer.  (This format is of marginal
     use, because all numbers in 'awk' are floating point; it is
     provided primarily for compatibility with C.)

'%x', '%X'
     Print an unsigned hexadecimal integer; '%X' uses the letters 'A'
     through 'F' instead of 'a' through 'f' (*note
     Nondecimal-numbers::).

'%%'
     Print a single '%'.  This does not consume an argument and it
     ignores any modifiers.

     NOTE: When using the integer format-control letters for values that
     are outside the range of the widest C integer type, 'gawk' switches
     to the '%g' format specifier.  If '--lint' is provided on the
     command line (*note Options::), 'gawk' warns about this.  Other
     versions of 'awk' may print invalid values or do something else
     entirely.  (d.c.)


File: gawk.info,  Node: Format Modifiers,  Next: Printf Examples,  Prev: Control Letters,  Up: Printf

5.5.3 Modifiers for 'printf' Formats
------------------------------------

A format specification can also include "modifiers" that can control how
much of the item's value is printed, as well as how much space it gets.
The modifiers come between the '%' and the format-control letter.  We
use the bullet symbol "*" in the following examples to represent spaces
in the output.  Here are the possible modifiers, in the order in which
they may appear:

'N$'
     An integer constant followed by a '$' is a "positional specifier".
     Normally, format specifications are applied to arguments in the
     order given in the format string.  With a positional specifier, the
     format specification is applied to a specific argument, instead of
     what would be the next argument in the list.  Positional specifiers
     begin counting with one.  Thus:

          printf "%s %s\n", "don't", "panic"
          printf "%2$s %1$s\n", "panic", "don't"

     prints the famous friendly message twice.

     At first glance, this feature doesn't seem to be of much use.  It
     is in fact a 'gawk' extension, intended for use in translating
     messages at runtime.  *Note Printf Ordering::, which describes how
     and why to use positional specifiers.  For now, we ignore them.

'-' (Minus)
     The minus sign, used before the width modifier (see later on in
     this list), says to left-justify the argument within its specified
     width.  Normally, the argument is printed right-justified in the
     specified width.  Thus:

          printf "%-4s", "foo"

     prints 'foo*'.

SPACE
     For numeric conversions, prefix positive values with a space and
     negative values with a minus sign.

'+'
     The plus sign, used before the width modifier (see later on in this
     list), says to always supply a sign for numeric conversions, even
     if the data to format is positive.  The '+' overrides the space
     modifier.

'#'
     Use an "alternative form" for certain control letters.  For '%o',
     supply a leading zero.  For '%x' and '%X', supply a leading '0x' or
     '0X' for a nonzero result.  For '%e', '%E', '%f', and '%F', the
     result always contains a decimal point.  For '%g' and '%G',
     trailing zeros are not removed from the result.

'0'
     A leading '0' (zero) acts as a flag indicating that output should
     be padded with zeros instead of spaces.  This applies only to the
     numeric output formats.  This flag only has an effect when the
     field width is wider than the value to print.

'''
     A single quote or apostrophe character is a POSIX extension to ISO
     C. It indicates that the integer part of a floating-point value, or
     the entire part of an integer decimal value, should have a
     thousands-separator character in it.  This only works in locales
     that support such characters.  For example:

          $ cat thousands.awk          Show source program
          -| BEGIN { printf "%'d\n", 1234567 }
          $ LC_ALL=C gawk -f thousands.awk
          -| 1234567                   Results in "C" locale
          $ LC_ALL=en_US.UTF-8 gawk -f thousands.awk
          -| 1,234,567                 Results in US English UTF locale

     For more information about locales and internationalization issues,
     see *note Locales::.

          NOTE: The ''' flag is a nice feature, but its use complicates
          things: it becomes difficult to use it in command-line
          programs.  For information on appropriate quoting tricks, see
          *note Quoting::.

WIDTH
     This is a number specifying the desired minimum width of a field.
     Inserting any number between the '%' sign and the format-control
     character forces the field to expand to this width.  The default
     way to do this is to pad with spaces on the left.  For example:

          printf "%4s", "foo"

     prints '*foo'.

     The value of WIDTH is a minimum width, not a maximum.  If the item
     value requires more than WIDTH characters, it can be as wide as
     necessary.  Thus, the following:

          printf "%4s", "foobar"

     prints 'foobar'.

     Preceding the WIDTH with a minus sign causes the output to be
     padded with spaces on the right, instead of on the left.

'.PREC'
     A period followed by an integer constant specifies the precision to
     use when printing.  The meaning of the precision varies by control
     letter:

     '%d', '%i', '%o', '%u', '%x', '%X'
          Minimum number of digits to print.

     '%e', '%E', '%f', '%F'
          Number of digits to the right of the decimal point.

     '%g', '%G'
          Maximum number of significant digits.

     '%s'
          Maximum number of characters from the string that should
          print.

     Thus, the following:

          printf "%.4s", "foobar"

     prints 'foob'.

   The C library 'printf''s dynamic WIDTH and PREC capability (e.g.,
'"%*.*s"') is supported.  Instead of supplying explicit WIDTH and/or
PREC values in the format string, they are passed in the argument list.
For example:

     w = 5
     p = 3
     s = "abcdefg"
     printf "%*.*s\n", w, p, s

is exactly equivalent to:

     s = "abcdefg"
     printf "%5.3s\n", s

Both programs output '**abc'.  Earlier versions of 'awk' did not support
this capability.  If you must use such a version, you may simulate this
feature by using concatenation to build up the format string, like so:

     w = 5
     p = 3
     s = "abcdefg"
     printf "%" w "." p "s\n", s

This is not particularly easy to read, but it does work.

   C programmers may be used to supplying additional modifiers ('h',
'j', 'l', 'L', 't', and 'z') in 'printf' format strings.  These are not
valid in 'awk'.  Most 'awk' implementations silently ignore them.  If
'--lint' is provided on the command line (*note Options::), 'gawk' warns
about their use.  If '--posix' is supplied, their use is a fatal error.


File: gawk.info,  Node: Printf Examples,  Prev: Format Modifiers,  Up: Printf

5.5.4 Examples Using 'printf'
-----------------------------

The following simple example shows how to use 'printf' to make an
aligned table:

     awk '{ printf "%-10s %s\n", $1, $2 }' mail-list

This command prints the names of the people ('$1') in the file
'mail-list' as a string of 10 characters that are left-justified.  It
also prints the phone numbers ('$2') next on the line.  This produces an
aligned two-column table of names and phone numbers, as shown here:

     $ awk '{ printf "%-10s %s\n", $1, $2 }' mail-list
     -| Amelia     555-5553
     -| Anthony    555-3412
     -| Becky      555-7685
     -| Bill       555-1675
     -| Broderick  555-0542
     -| Camilla    555-2912
     -| Fabius     555-1234
     -| Julie      555-6699
     -| Martin     555-6480
     -| Samuel     555-3430
     -| Jean-Paul  555-2127

   In this case, the phone numbers had to be printed as strings because
the numbers are separated by dashes.  Printing the phone numbers as
numbers would have produced just the first three digits: '555'.  This
would have been pretty confusing.

   It wasn't necessary to specify a width for the phone numbers because
they are last on their lines.  They don't need to have spaces after
them.

   The table could be made to look even nicer by adding headings to the
tops of the columns.  This is done using a 'BEGIN' rule (*note
BEGIN/END::) so that the headers are only printed once, at the beginning
of the 'awk' program:

     awk 'BEGIN { print "Name      Number"
                  print "----      ------" }
                { printf "%-10s %s\n", $1, $2 }' mail-list

   The preceding example mixes 'print' and 'printf' statements in the
same program.  Using just 'printf' statements can produce the same
results:

     awk 'BEGIN { printf "%-10s %s\n", "Name", "Number"
                  printf "%-10s %s\n", "----", "------" }
                { printf "%-10s %s\n", $1, $2 }' mail-list

Printing each column heading with the same format specification used for
the column elements ensures that the headings are aligned just like the
columns.

   The fact that the same format specification is used three times can
be emphasized by storing it in a variable, like this:

     awk 'BEGIN { format = "%-10s %s\n"
                  printf format, "Name", "Number"
                  printf format, "----", "------" }
                { printf format, $1, $2 }' mail-list


File: gawk.info,  Node: Redirection,  Next: Special FD,  Prev: Printf,  Up: Printing

5.6 Redirecting Output of 'print' and 'printf'
==============================================

So far, the output from 'print' and 'printf' has gone to the standard
output, usually the screen.  Both 'print' and 'printf' can also send
their output to other places.  This is called "redirection".

     NOTE: When '--sandbox' is specified (*note Options::), redirecting
     output to files, pipes, and coprocesses is disabled.

   A redirection appears after the 'print' or 'printf' statement.
Redirections in 'awk' are written just like redirections in shell
commands, except that they are written inside the 'awk' program.

   There are four forms of output redirection: output to a file, output
appended to a file, output through a pipe to another command, and output
to a coprocess.  We show them all for the 'print' statement, but they
work identically for 'printf':

'print ITEMS > OUTPUT-FILE'
     This redirection prints the items into the output file named
     OUTPUT-FILE.  The file name OUTPUT-FILE can be any expression.  Its
     value is changed to a string and then used as a file name (*note
     Expressions::).

     When this type of redirection is used, the OUTPUT-FILE is erased
     before the first output is written to it.  Subsequent writes to the
     same OUTPUT-FILE do not erase OUTPUT-FILE, but append to it.  (This
     is different from how you use redirections in shell scripts.)  If
     OUTPUT-FILE does not exist, it is created.  For example, here is
     how an 'awk' program can write a list of peoples' names to one file
     named 'name-list', and a list of phone numbers to another file
     named 'phone-list':

          $ awk '{ print $2 > "phone-list"
          >        print $1 > "name-list" }' mail-list
          $ cat phone-list
          -| 555-5553
          -| 555-3412
          ...
          $ cat name-list
          -| Amelia
          -| Anthony
          ...

     Each output file contains one name or number per line.

'print ITEMS >> OUTPUT-FILE'
     This redirection prints the items into the preexisting output file
     named OUTPUT-FILE.  The difference between this and the single-'>'
     redirection is that the old contents (if any) of OUTPUT-FILE are
     not erased.  Instead, the 'awk' output is appended to the file.  If
     OUTPUT-FILE does not exist, then it is created.

'print ITEMS | COMMAND'
     It is possible to send output to another program through a pipe
     instead of into a file.  This redirection opens a pipe to COMMAND,
     and writes the values of ITEMS through this pipe to another process
     created to execute COMMAND.

     The redirection argument COMMAND is actually an 'awk' expression.
     Its value is converted to a string whose contents give the shell
     command to be run.  For example, the following produces two files,
     one unsorted list of peoples' names, and one list sorted in reverse
     alphabetical order:

          awk '{ print $1 > "names.unsorted"
                 command = "sort -r > names.sorted"
                 print $1 | command }' mail-list

     The unsorted list is written with an ordinary redirection, while
     the sorted list is written by piping through the 'sort' utility.

     The next example uses redirection to mail a message to the mailing
     list 'bug-system'.  This might be useful when trouble is
     encountered in an 'awk' script run periodically for system
     maintenance:

          report = "mail bug-system"
          print("Awk script failed:", $0) | report
          print("at record number", FNR, "of", FILENAME) | report
          close(report)

     The 'close()' function is called here because it's a good idea to
     close the pipe as soon as all the intended output has been sent to
     it.  *Note Close Files And Pipes:: for more information.

     This example also illustrates the use of a variable to represent a
     FILE or COMMAND--it is not necessary to always use a string
     constant.  Using a variable is generally a good idea, because (if
     you mean to refer to that same file or command) 'awk' requires that
     the string value be written identically every time.

'print ITEMS |& COMMAND'
     This redirection prints the items to the input of COMMAND.  The
     difference between this and the single-'|' redirection is that the
     output from COMMAND can be read with 'getline'.  Thus, COMMAND is a
     "coprocess", which works together with but is subsidiary to the
     'awk' program.

     This feature is a 'gawk' extension, and is not available in POSIX
     'awk'.  *Note Getline/Coprocess::, for a brief discussion.  *Note
     Two-way I/O::, for a more complete discussion.

   Redirecting output using '>', '>>', '|', or '|&' asks the system to
open a file, pipe, or coprocess only if the particular FILE or COMMAND
you specify has not already been written to by your program or if it has
been closed since it was last written to.

   It is a common error to use '>' redirection for the first 'print' to
a file, and then to use '>>' for subsequent output:

     # clear the file
     print "Don't panic" > "guide.txt"
     ...
     # append
     print "Avoid improbability generators" >> "guide.txt"

This is indeed how redirections must be used from the shell.  But in
'awk', it isn't necessary.  In this kind of case, a program should use
'>' for all the 'print' statements, because the output file is only
opened once.  (It happens that if you mix '>' and '>>' output is
produced in the expected order.  However, mixing the operators for the
same file is definitely poor style, and is confusing to readers of your
program.)

   Many older 'awk' implementations limit the number of pipelines that
an 'awk' program may have open to just one!  In 'gawk', there is no such
limit.  'gawk' allows a program to open as many pipelines as the
underlying operating system permits.

                           Piping into 'sh'

   A particularly powerful way to use redirection is to build command
lines and pipe them into the shell, 'sh'.  For example, suppose you have
a list of files brought over from a system where all the file names are
stored in uppercase, and you wish to rename them to have names in all
lowercase.  The following program is both simple and efficient:

     { printf("mv %s %s\n", $0, tolower($0)) | "sh" }

     END { close("sh") }

   The 'tolower()' function returns its argument string with all
uppercase characters converted to lowercase (*note String Functions::).
The program builds up a list of command lines, using the 'mv' utility to
rename the files.  It then sends the list to the shell for execution.

   *Note Shell Quoting:: for a function that can help in generating
command lines to be fed to the shell.


File: gawk.info,  Node: Special FD,  Next: Special Files,  Prev: Redirection,  Up: Printing

5.7 Special Files for Standard Preopened Data Streams
=====================================================

Running programs conventionally have three input and output streams
already available to them for reading and writing.  These are known as
the "standard input", "standard output", and "standard error output".
These open streams (and any other open files or pipes) are often
referred to by the technical term "file descriptors".

   These streams are, by default, connected to your keyboard and screen,
but they are often redirected with the shell, via the '<', '<<', '>',
'>>', '>&', and '|' operators.  Standard error is typically used for
writing error messages; the reason there are two separate streams,
standard output and standard error, is so that they can be redirected
separately.

   In traditional implementations of 'awk', the only way to write an
error message to standard error in an 'awk' program is as follows:

     print "Serious error detected!" | "cat 1>&2"

This works by opening a pipeline to a shell command that can access the
standard error stream that it inherits from the 'awk' process.  This is
far from elegant, and it also requires a separate process.  So people
writing 'awk' programs often don't do this.  Instead, they send the
error messages to the screen, like this:

     print "Serious error detected!" > "/dev/tty"

('/dev/tty' is a special file supplied by the operating system that is
connected to your keyboard and screen.  It represents the "terminal,"(1)
which on modern systems is a keyboard and screen, not a serial console.)
This generally has the same effect, but not always: although the
standard error stream is usually the screen, it can be redirected; when
that happens, writing to the screen is not correct.  In fact, if 'awk'
is run from a background job, it may not have a terminal at all.  Then
opening '/dev/tty' fails.

   'gawk', BWK 'awk', and 'mawk' provide special file names for
accessing the three standard streams.  If the file name matches one of
these special names when 'gawk' (or one of the others) redirects input
or output, then it directly uses the descriptor that the file name
stands for.  These special file names work for all operating systems
that 'gawk' has been ported to, not just those that are POSIX-compliant:

'/dev/stdin'
     The standard input (file descriptor 0).

'/dev/stdout'
     The standard output (file descriptor 1).

'/dev/stderr'
     The standard error output (file descriptor 2).

   With these facilities, the proper way to write an error message then
becomes:

     print "Serious error detected!" > "/dev/stderr"

   Note the use of quotes around the file name.  Like with any other
redirection, the value must be a string.  It is a common error to omit
the quotes, which leads to confusing results.

   'gawk' does not treat these file names as special when in
POSIX-compatibility mode.  However, because BWK 'awk' supports them,
'gawk' does support them even when invoked with the '--traditional'
option (*note Options::).

   ---------- Footnotes ----------

   (1) The "tty" in '/dev/tty' stands for "Teletype," a serial terminal.


File: gawk.info,  Node: Special Files,  Next: Close Files And Pipes,  Prev: Special FD,  Up: Printing

5.8 Special File names in 'gawk'
================================

Besides access to standard input, standard output, and standard error,
'gawk' provides access to any open file descriptor.  Additionally, there
are special file names reserved for TCP/IP networking.

* Menu:

* Other Inherited Files::       Accessing other open files with
                                'gawk'.
* Special Network::             Special files for network communications.
* Special Caveats::             Things to watch out for.


File: gawk.info,  Node: Other Inherited Files,  Next: Special Network,  Up: Special Files

5.8.1 Accessing Other Open Files with 'gawk'
--------------------------------------------

Besides the '/dev/stdin', '/dev/stdout', and '/dev/stderr' special file
names mentioned earlier, 'gawk' provides syntax for accessing any other
inherited open file:

'/dev/fd/N'
     The file associated with file descriptor N.  Such a file must be
     opened by the program initiating the 'awk' execution (typically the
     shell).  Unless special pains are taken in the shell from which
     'gawk' is invoked, only descriptors 0, 1, and 2 are available.

   The file names '/dev/stdin', '/dev/stdout', and '/dev/stderr' are
essentially aliases for '/dev/fd/0', '/dev/fd/1', and '/dev/fd/2',
respectively.  However, those names are more self-explanatory.

   Note that using 'close()' on a file name of the form '"/dev/fd/N"',
for file descriptor numbers above two, does actually close the given
file descriptor.


File: gawk.info,  Node: Special Network,  Next: Special Caveats,  Prev: Other Inherited Files,  Up: Special Files

5.8.2 Special Files for Network Communications
----------------------------------------------

'gawk' programs can open a two-way TCP/IP connection, acting as either a
client or a server.  This is done using a special file name of the form:

     /NET-TYPE/PROTOCOL/LOCAL-PORT/REMOTE-HOST/REMOTE-PORT

   The NET-TYPE is one of 'inet', 'inet4', or 'inet6'.  The PROTOCOL is
one of 'tcp' or 'udp', and the other fields represent the other
essential pieces of information for making a networking connection.
These file names are used with the '|&' operator for communicating with
a coprocess (*note Two-way I/O::).  This is an advanced feature,
mentioned here only for completeness.  Full discussion is delayed until
*note TCP/IP Networking::.


File: gawk.info,  Node: Special Caveats,  Prev: Special Network,  Up: Special Files

5.8.3 Special File name Caveats
-------------------------------

Here are some things to bear in mind when using the special file names
that 'gawk' provides:

   * Recognition of the file names for the three standard preopened
     files is disabled only in POSIX mode.

   * Recognition of the other special file names is disabled if 'gawk'
     is in compatibility mode (either '--traditional' or '--posix';
     *note Options::).

   * 'gawk' _always_ interprets these special file names.  For example,
     using '/dev/fd/4' for output actually writes on file descriptor 4,
     and not on a new file descriptor that is 'dup()'ed from file
     descriptor 4.  Most of the time this does not matter; however, it
     is important to _not_ close any of the files related to file
     descriptors 0, 1, and 2.  Doing so results in unpredictable
     behavior.


File: gawk.info,  Node: Close Files And Pipes,  Next: Output Summary,  Prev: Special Files,  Up: Printing

5.9 Closing Input and Output Redirections
=========================================

If the same file name or the same shell command is used with 'getline'
more than once during the execution of an 'awk' program (*note
Getline::), the file is opened (or the command is executed) the first
time only.  At that time, the first record of input is read from that
file or command.  The next time the same file or command is used with
'getline', another record is read from it, and so on.

   Similarly, when a file or pipe is opened for output, 'awk' remembers
the file name or command associated with it, and subsequent writes to
the same file or command are appended to the previous writes.  The file
or pipe stays open until 'awk' exits.

   This implies that special steps are necessary in order to read the
same file again from the beginning, or to rerun a shell command (rather
than reading more output from the same command).  The 'close()' function
makes these things possible:

     close(FILENAME)

or:

     close(COMMAND)

   The argument FILENAME or COMMAND can be any expression.  Its value
must _exactly_ match the string that was used to open the file or start
the command (spaces and other "irrelevant" characters included).  For
example, if you open a pipe with this:

     "sort -r names" | getline foo

then you must close it with this:

     close("sort -r names")

   Once this function call is executed, the next 'getline' from that
file or command, or the next 'print' or 'printf' to that file or
command, reopens the file or reruns the command.  Because the expression
that you use to close a file or pipeline must exactly match the
expression used to open the file or run the command, it is good practice
to use a variable to store the file name or command.  The previous
example becomes the following:

     sortcom = "sort -r names"
     sortcom | getline foo
     ...
     close(sortcom)

This helps avoid hard-to-find typographical errors in your 'awk'
programs.  Here are some of the reasons for closing an output file:

   * To write a file and read it back later on in the same 'awk'
     program.  Close the file after writing it, then begin reading it
     with 'getline'.

   * To write numerous files, successively, in the same 'awk' program.
     If the files aren't closed, eventually 'awk' may exceed a system
     limit on the number of open files in one process.  It is best to
     close each one when the program has finished writing it.

   * To make a command finish.  When output is redirected through a
     pipe, the command reading the pipe normally continues to try to
     read input as long as the pipe is open.  Often this means the
     command cannot really do its work until the pipe is closed.  For
     example, if output is redirected to the 'mail' program, the message
     is not actually sent until the pipe is closed.

   * To run the same program a second time, with the same arguments.
     This is not the same thing as giving more input to the first run!

     For example, suppose a program pipes output to the 'mail' program.
     If it outputs several lines redirected to this pipe without closing
     it, they make a single message of several lines.  By contrast, if
     the program closes the pipe after each line of output, then each
     line makes a separate message.

   If you use more files than the system allows you to have open, 'gawk'
attempts to multiplex the available open files among your data files.
'gawk''s ability to do this depends upon the facilities of your
operating system, so it may not always work.  It is therefore both good
practice and good portability advice to always use 'close()' on your
files when you are done with them.  In fact, if you are using a lot of
pipes, it is essential that you close commands when done.  For example,
consider something like this:

     {
         ...
         command = ("grep " $1 " /some/file | my_prog -q " $3)
         while ((command | getline) > 0) {
             PROCESS OUTPUT OF command
         }
         # need close(command) here
     }

   This example creates a new pipeline based on data in _each_ record.
Without the call to 'close()' indicated in the comment, 'awk' creates
child processes to run the commands, until it eventually runs out of
file descriptors for more pipelines.

   Even though each command has finished (as indicated by the
end-of-file return status from 'getline'), the child process is not
terminated;(1) more importantly, the file descriptor for the pipe is not
closed and released until 'close()' is called or 'awk' exits.

   'close()' silently does nothing if given an argument that does not
represent a file, pipe, or coprocess that was opened with a redirection.
In such a case, it returns a negative value, indicating an error.  In
addition, 'gawk' sets 'ERRNO' to a string indicating the error.

   Note also that 'close(FILENAME)' has no "magic" effects on the
implicit loop that reads through the files named on the command line.
It is, more likely, a close of a file that was never opened with a
redirection, so 'awk' silently does nothing, except return a negative
value.

   When using the '|&' operator to communicate with a coprocess, it is
occasionally useful to be able to close one end of the two-way pipe
without closing the other.  This is done by supplying a second argument
to 'close()'.  As in any other call to 'close()', the first argument is
the name of the command or special file used to start the coprocess.
The second argument should be a string, with either of the values '"to"'
or '"from"'.  Case does not matter.  As this is an advanced feature,
discussion is delayed until *note Two-way I/O::, which describes it in
more detail and gives an example.

                    Using 'close()''s Return Value

   In many older versions of Unix 'awk', the 'close()' function is
actually a statement.  (d.c.)  It is a syntax error to try and use the
return value from 'close()':

     command = "..."
     command | getline info
     retval = close(command)  # syntax error in many Unix awks

   'gawk' treats 'close()' as a function.  The return value is -1 if the
argument names something that was never opened with a redirection, or if
there is a system problem closing the file or process.  In these cases,
'gawk' sets the predefined variable 'ERRNO' to a string describing the
problem.

   In 'gawk', when closing a pipe or coprocess (input or output), the
return value is the exit status of the command.(2)  Otherwise, it is the
return value from the system's 'close()' or 'fclose()' C functions when
closing input or output files, respectively.  This value is zero if the
close succeeds, or -1 if it fails.

   The POSIX standard is very vague; it says that 'close()' returns zero
on success and a nonzero value otherwise.  In general, different
implementations vary in what they report when closing pipes; thus, the
return value cannot be used portably.  (d.c.)  In POSIX mode (*note
Options::), 'gawk' just returns zero when closing a pipe.

   ---------- Footnotes ----------

   (1) The technical terminology is rather morbid.  The finished child
is called a "zombie," and cleaning up after it is referred to as
"reaping."

   (2) This is a full 16-bit value as returned by the 'wait()' system
call.  See the system manual pages for information on how to decode this
value.


File: gawk.info,  Node: Output Summary,  Next: Output Exercises,  Prev: Close Files And Pipes,  Up: Printing

5.10 Summary
============

   * The 'print' statement prints comma-separated expressions.  Each
     expression is separated by the value of 'OFS' and terminated by the
     value of 'ORS'.  'OFMT' provides the conversion format for numeric
     values for the 'print' statement.

   * The 'printf' statement provides finer-grained control over output,
     with format-control letters for different data types and various
     flags that modify the behavior of the format-control letters.

   * Output from both 'print' and 'printf' may be redirected to files,
     pipes, and coprocesses.

   * 'gawk' provides special file names for access to standard input,
     output, and error, and for network communications.

   * Use 'close()' to close open file, pipe, and coprocess redirections.
     For coprocesses, it is possible to close only one direction of the
     communications.


File: gawk.info,  Node: Output Exercises,  Prev: Output Summary,  Up: Printing

5.11 Exercises
==============

  1. Rewrite the program:

          awk 'BEGIN { print "Month Crates"
                       print "----- ------" }
                     { print $1, "     ", $2 }' inventory-shipped

     from *note Output Separators::, by using a new value of 'OFS'.

  2. Use the 'printf' statement to line up the headings and table data
     for the 'inventory-shipped' example that was covered in *note
     Print::.

  3. What happens if you forget the double quotes when redirecting
     output, as follows:

          BEGIN { print "Serious error detected!" > /dev/stderr }


File: gawk.info,  Node: Expressions,  Next: Patterns and Actions,  Prev: Printing,  Up: Top

6 Expressions
*************

Expressions are the basic building blocks of 'awk' patterns and actions.
An expression evaluates to a value that you can print, test, or pass to
a function.  Additionally, an expression can assign a new value to a
variable or a field by using an assignment operator.

   An expression can serve as a pattern or action statement on its own.
Most other kinds of statements contain one or more expressions that
specify the data on which to operate.  As in other languages,
expressions in 'awk' can include variables, array references, constants,
and function calls, as well as combinations of these with various
operators.

* Menu:

* Values::                      Constants, Variables, and Regular Expressions.
* All Operators::               'gawk''s operators.
* Truth Values and Conditions:: Testing for true and false.
* Function Calls::              A function call is an expression.
* Precedence::                  How various operators nest.
* Locales::                     How the locale affects things.
* Expressions Summary::         Expressions summary.


File: gawk.info,  Node: Values,  Next: All Operators,  Up: Expressions

6.1 Constants, Variables, and Conversions
=========================================

Expressions are built up from values and the operations performed upon
them.  This minor node describes the elementary objects that provide the
values used in expressions.

* Menu:

* Constants::                   String, numeric and regexp constants.
* Using Constant Regexps::      When and how to use a regexp constant.
* Variables::                   Variables give names to values for later use.
* Conversion::                  The conversion of strings to numbers and vice
                                versa.


File: gawk.info,  Node: Constants,  Next: Using Constant Regexps,  Up: Values

6.1.1 Constant Expressions
--------------------------

The simplest type of expression is the "constant", which always has the
same value.  There are three types of constants: numeric, string, and
regular expression.

   Each is used in the appropriate context when you need a data value
that isn't going to change.  Numeric constants can have different forms,
but are internally stored in an identical manner.

* Menu:

* Scalar Constants::            Numeric and string constants.
* Nondecimal-numbers::          What are octal and hex numbers.
* Regexp Constants::            Regular Expression constants.


File: gawk.info,  Node: Scalar Constants,  Next: Nondecimal-numbers,  Up: Constants

6.1.1.1 Numeric and String Constants
....................................

A "numeric constant" stands for a number.  This number can be an
integer, a decimal fraction, or a number in scientific (exponential)
notation.(1)  Here are some examples of numeric constants that all have
the same value:

     105
     1.05e+2
     1050e-1

   A "string constant" consists of a sequence of characters enclosed in
double quotation marks.  For example:

     "parrot"

represents the string whose contents are 'parrot'.  Strings in 'gawk'
can be of any length, and they can contain any of the possible eight-bit
ASCII characters, including ASCII NUL (character code zero).  Other
'awk' implementations may have difficulty with some character codes.

   ---------- Footnotes ----------

   (1) The internal representation of all numbers, including integers,
uses double-precision floating-point numbers.  On most modern systems,
these are in IEEE 754 standard format.  *Note Arbitrary Precision
Arithmetic::, for much more information.


File: gawk.info,  Node: Nondecimal-numbers,  Next: Regexp Constants,  Prev: Scalar Constants,  Up: Constants

6.1.1.2 Octal and Hexadecimal Numbers
.....................................

In 'awk', all numbers are in decimal (i.e., base 10).  Many other
programming languages allow you to specify numbers in other bases, often
octal (base 8) and hexadecimal (base 16).  In octal, the numbers go 0,
1, 2, 3, 4, 5, 6, 7, 10, 11, 12, and so on.  Just as '11' in decimal is
1 times 10 plus 1, so '11' in octal is 1 times 8 plus 1.  This equals 9
in decimal.  In hexadecimal, there are 16 digits.  Because the everyday
decimal number system only has ten digits ('0'-'9'), the letters 'a'
through 'f' are used to represent the rest.  (Case in the letters is
usually irrelevant; hexadecimal 'a' and 'A' have the same value.)  Thus,
'11' in hexadecimal is 1 times 16 plus 1, which equals 17 in decimal.

   Just by looking at plain '11', you can't tell what base it's in.  So,
in C, C++, and other languages derived from C, there is a special
notation to signify the base.  Octal numbers start with a leading '0',
and hexadecimal numbers start with a leading '0x' or '0X':

'11'
     Decimal value 11

'011'
     Octal 11, decimal value 9

'0x11'
     Hexadecimal 11, decimal value 17

   This example shows the difference:

     $ gawk 'BEGIN { printf "%d, %d, %d\n", 011, 11, 0x11 }'
     -| 9, 11, 17

   Being able to use octal and hexadecimal constants in your programs is
most useful when working with data that cannot be represented
conveniently as characters or as regular numbers, such as binary data of
various sorts.

   'gawk' allows the use of octal and hexadecimal constants in your
program text.  However, such numbers in the input data are not treated
differently; doing so by default would break old programs.  (If you
really need to do this, use the '--non-decimal-data' command-line
option; *note Nondecimal Data::.)  If you have octal or hexadecimal
data, you can use the 'strtonum()' function (*note String Functions::)
to convert the data into a number.  Most of the time, you will want to
use octal or hexadecimal constants when working with the built-in
bit-manipulation functions; see *note Bitwise Functions:: for more
information.

   Unlike in some early C implementations, '8' and '9' are not valid in
octal constants.  For example, 'gawk' treats '018' as decimal 18:

     $ gawk 'BEGIN { print "021 is", 021 ; print 018 }'
     -| 021 is 17
     -| 18

   Octal and hexadecimal source code constants are a 'gawk' extension.
If 'gawk' is in compatibility mode (*note Options::), they are not
available.

              A Constant's Base Does Not Affect Its Value

   Once a numeric constant has been converted internally into a number,
'gawk' no longer remembers what the original form of the constant was;
the internal value is always used.  This has particular consequences for
conversion of numbers to strings:

     $ gawk 'BEGIN { printf "0x11 is <%s>\n", 0x11 }'
     -| 0x11 is <17>


File: gawk.info,  Node: Regexp Constants,  Prev: Nondecimal-numbers,  Up: Constants

6.1.1.3 Regular Expression Constants
....................................

A "regexp constant" is a regular expression description enclosed in
slashes, such as '/^beginning and end$/'.  Most regexps used in 'awk'
programs are constant, but the '~' and '!~' matching operators can also
match computed or dynamic regexps (which are typically just ordinary
strings or variables that contain a regexp, but could be more complex
expressions).


File: gawk.info,  Node: Using Constant Regexps,  Next: Variables,  Prev: Constants,  Up: Values

6.1.2 Using Regular Expression Constants
----------------------------------------

When used on the righthand side of the '~' or '!~' operators, a regexp
constant merely stands for the regexp that is to be matched.  However,
regexp constants (such as '/foo/') may be used like simple expressions.
When a regexp constant appears by itself, it has the same meaning as if
it appeared in a pattern (i.e., '($0 ~ /foo/)').  (d.c.)  *Note
Expression Patterns::.  This means that the following two code segments:

     if ($0 ~ /barfly/ || $0 ~ /camelot/)
         print "found"

and:

     if (/barfly/ || /camelot/)
         print "found"

are exactly equivalent.  One rather bizarre consequence of this rule is
that the following Boolean expression is valid, but does not do what its
author probably intended:

     # Note that /foo/ is on the left of the ~
     if (/foo/ ~ $1) print "found foo"

This code is "obviously" testing '$1' for a match against the regexp
'/foo/'.  But in fact, the expression '/foo/ ~ $1' really means '($0 ~
/foo/) ~ $1'.  In other words, first match the input record against the
regexp '/foo/'.  The result is either zero or one, depending upon the
success or failure of the match.  That result is then matched against
the first field in the record.  Because it is unlikely that you would
ever really want to make this kind of test, 'gawk' issues a warning when
it sees this construct in a program.  Another consequence of this rule
is that the assignment statement:

     matches = /foo/

assigns either zero or one to the variable 'matches', depending upon the
contents of the current input record.

   Constant regular expressions are also used as the first argument for
the 'gensub()', 'sub()', and 'gsub()' functions, as the second argument
of the 'match()' function, and as the third argument of the 'split()'
and 'patsplit()' functions (*note String Functions::).  Modern
implementations of 'awk', including 'gawk', allow the third argument of
'split()' to be a regexp constant, but some older implementations do
not.  (d.c.)  Because some built-in functions accept regexp constants as
arguments, confusion can arise when attempting to use regexp constants
as arguments to user-defined functions (*note User-defined::).  For
example:

     function mysub(pat, repl, str, global)
     {
         if (global)
             gsub(pat, repl, str)
         else
             sub(pat, repl, str)
         return str
     }

     {
         ...
         text = "hi! hi yourself!"
         mysub(/hi/, "howdy", text, 1)
         ...
     }

   In this example, the programmer wants to pass a regexp constant to
the user-defined function 'mysub()', which in turn passes it on to
either 'sub()' or 'gsub()'.  However, what really happens is that the
'pat' parameter is assigned a value of either one or zero, depending
upon whether or not '$0' matches '/hi/'.  'gawk' issues a warning when
it sees a regexp constant used as a parameter to a user-defined
function, because passing a truth value in this way is probably not what
was intended.


File: gawk.info,  Node: Variables,  Next: Conversion,  Prev: Using Constant Regexps,  Up: Values

6.1.3 Variables
---------------

"Variables" are ways of storing values at one point in your program for
use later in another part of your program.  They can be manipulated
entirely within the program text, and they can also be assigned values
on the 'awk' command line.

* Menu:

* Using Variables::             Using variables in your programs.
* Assignment Options::          Setting variables on the command line and a
                                summary of command-line syntax. This is an
                                advanced method of input.


File: gawk.info,  Node: Using Variables,  Next: Assignment Options,  Up: Variables

6.1.3.1 Using Variables in a Program
....................................

Variables let you give names to values and refer to them later.
Variables have already been used in many of the examples.  The name of a
variable must be a sequence of letters, digits, or underscores, and it
may not begin with a digit.  Here, a "letter" is any one of the 52
upper- and lowercase English letters.  Other characters that may be
defined as letters in non-English locales are not valid in variable
names.  Case is significant in variable names; 'a' and 'A' are distinct
variables.

   A variable name is a valid expression by itself; it represents the
variable's current value.  Variables are given new values with
"assignment operators", "increment operators", and "decrement operators"
(*note Assignment Ops::).  In addition, the 'sub()' and 'gsub()'
functions can change a variable's value, and the 'match()', 'split()',
and 'patsplit()' functions can change the contents of their array
parameters (*note String Functions::).

   A few variables have special built-in meanings, such as 'FS' (the
field separator) and 'NF' (the number of fields in the current input
record).  *Note Built-in Variables:: for a list of the predefined
variables.  These predefined variables can be used and assigned just
like all other variables, but their values are also used or changed
automatically by 'awk'.  All predefined variables' names are entirely
uppercase.

   Variables in 'awk' can be assigned either numeric or string values.
The kind of value a variable holds can change over the life of a
program.  By default, variables are initialized to the empty string,
which is zero if converted to a number.  There is no need to explicitly
initialize a variable in 'awk', which is what you would do in C and in
most other traditional languages.


File: gawk.info,  Node: Assignment Options,  Prev: Using Variables,  Up: Variables

6.1.3.2 Assigning Variables on the Command Line
...............................................

Any 'awk' variable can be set by including a "variable assignment" among
the arguments on the command line when 'awk' is invoked (*note Other
Arguments::).  Such an assignment has the following form:

     VARIABLE=TEXT

With it, a variable is set either at the beginning of the 'awk' run or
in between input files.  When the assignment is preceded with the '-v'
option, as in the following:

     -v VARIABLE=TEXT

the variable is set at the very beginning, even before the 'BEGIN' rules
execute.  The '-v' option and its assignment must precede all the file
name arguments, as well as the program text.  (*Note Options:: for more
information about the '-v' option.)  Otherwise, the variable assignment
is performed at a time determined by its position among the input file
arguments--after the processing of the preceding input file argument.
For example:

     awk '{ print $n }' n=4 inventory-shipped n=2 mail-list

prints the value of field number 'n' for all input records.  Before the
first file is read, the command line sets the variable 'n' equal to
four.  This causes the fourth field to be printed in lines from
'inventory-shipped'.  After the first file has finished, but before the
second file is started, 'n' is set to two, so that the second field is
printed in lines from 'mail-list':

     $ awk '{ print $n }' n=4 inventory-shipped n=2 mail-list
     -| 15
     -| 24
     ...
     -| 555-5553
     -| 555-3412
     ...

   Command-line arguments are made available for explicit examination by
the 'awk' program in the 'ARGV' array (*note ARGC and ARGV::).  'awk'
processes the values of command-line assignments for escape sequences
(*note Escape Sequences::).  (d.c.)


File: gawk.info,  Node: Conversion,  Prev: Variables,  Up: Values

6.1.4 Conversion of Strings and Numbers
---------------------------------------

Number-to-string and string-to-number conversion are generally
straightforward.  There can be subtleties to be aware of; this minor
node discusses this important facet of 'awk'.

* Menu:

* Strings And Numbers::         How 'awk' Converts Between Strings And
                                Numbers.
* Locale influences conversions:: How the locale may affect conversions.


File: gawk.info,  Node: Strings And Numbers,  Next: Locale influences conversions,  Up: Conversion

6.1.4.1 How 'awk' Converts Between Strings and Numbers
......................................................

Strings are converted to numbers and numbers are converted to strings,
if the context of the 'awk' program demands it.  For example, if the
value of either 'foo' or 'bar' in the expression 'foo + bar' happens to
be a string, it is converted to a number before the addition is
performed.  If numeric values appear in string concatenation, they are
converted to strings.  Consider the following:

     two = 2; three = 3
     print (two three) + 4

This prints the (numeric) value 27.  The numeric values of the variables
'two' and 'three' are converted to strings and concatenated together.
The resulting string is converted back to the number 23, to which 4 is
then added.

   If, for some reason, you need to force a number to be converted to a
string, concatenate that number with the empty string, '""'.  To force a
string to be converted to a number, add zero to that string.  A string
is converted to a number by interpreting any numeric prefix of the
string as numerals: '"2.5"' converts to 2.5, '"1e3"' converts to 1,000,
and '"25fix"' has a numeric value of 25.  Strings that can't be
interpreted as valid numbers convert to zero.

   The exact manner in which numbers are converted into strings is
controlled by the 'awk' predefined variable 'CONVFMT' (*note Built-in
Variables::).  Numbers are converted using the 'sprintf()' function with
'CONVFMT' as the format specifier (*note String Functions::).

   'CONVFMT''s default value is '"%.6g"', which creates a value with at
most six significant digits.  For some applications, you might want to
change it to specify more precision.  On most modern machines, 17 digits
is usually enough to capture a floating-point number's value exactly.(1)

   Strange results can occur if you set 'CONVFMT' to a string that
doesn't tell 'sprintf()' how to format floating-point numbers in a
useful way.  For example, if you forget the '%' in the format, 'awk'
converts all numbers to the same constant string.

   As a special case, if a number is an integer, then the result of
converting it to a string is _always_ an integer, no matter what the
value of 'CONVFMT' may be.  Given the following code fragment:

     CONVFMT = "%2.2f"
     a = 12
     b = a ""

'b' has the value '"12"', not '"12.00"'.  (d.c.)

           Pre-POSIX 'awk' Used 'OFMT' for String Conversion

   Prior to the POSIX standard, 'awk' used the value of 'OFMT' for
converting numbers to strings.  'OFMT' specifies the output format to
use when printing numbers with 'print'.  'CONVFMT' was introduced in
order to separate the semantics of conversion from the semantics of
printing.  Both 'CONVFMT' and 'OFMT' have the same default value:
'"%.6g"'.  In the vast majority of cases, old 'awk' programs do not
change their behavior.  *Note Print:: for more information on the
'print' statement.

   ---------- Footnotes ----------

   (1) Pathological cases can require up to 752 digits (!), but we doubt
that you need to worry about this.


File: gawk.info,  Node: Locale influences conversions,  Prev: Strings And Numbers,  Up: Conversion

6.1.4.2 Locales Can Influence Conversion
........................................

Where you are can matter when it comes to converting between numbers and
strings.  The local character set and language--the "locale"--can affect
numeric formats.  In particular, for 'awk' programs, it affects the
decimal point character and the thousands-separator character.  The
'"C"' locale, and most English-language locales, use the period
character ('.') as the decimal point and don't have a thousands
separator.  However, many (if not most) European and non-English locales
use the comma (',') as the decimal point character.  European locales
often use either a space or a period as the thousands separator, if they
have one.

   The POSIX standard says that 'awk' always uses the period as the
decimal point when reading the 'awk' program source code, and for
command-line variable assignments (*note Other Arguments::).  However,
when interpreting input data, for 'print' and 'printf' output, and for
number-to-string conversion, the local decimal point character is used.
(d.c.)  In all cases, numbers in source code and in input data cannot
have a thousands separator.  Here are some examples indicating the
difference in behavior, on a GNU/Linux system:

     $ export POSIXLY_CORRECT=1                        Force POSIX behavior
     $ gawk 'BEGIN { printf "%g\n", 3.1415927 }'
     -| 3.14159
     $ LC_ALL=en_DK.utf-8 gawk 'BEGIN { printf "%g\n", 3.1415927 }'
     -| 3,14159
     $ echo 4,321 | gawk '{ print $1 + 1 }'
     -| 5
     $ echo 4,321 | LC_ALL=en_DK.utf-8 gawk '{ print $1 + 1 }'
     -| 5,321

The 'en_DK.utf-8' locale is for English in Denmark, where the comma acts
as the decimal point separator.  In the normal '"C"' locale, 'gawk'
treats '4,321' as 4, while in the Danish locale, it's treated as the
full number including the fractional part, 4.321.

   Some earlier versions of 'gawk' fully complied with this aspect of
the standard.  However, many users in non-English locales complained
about this behavior, because their data used a period as the decimal
point, so the default behavior was restored to use a period as the
decimal point character.  You can use the '--use-lc-numeric' option
(*note Options::) to force 'gawk' to use the locale's decimal point
character.  ('gawk' also uses the locale's decimal point character when
in POSIX mode, either via '--posix' or the 'POSIXLY_CORRECT' environment
variable, as shown previously.)

   *note Table 6.1: table-locale-affects. describes the cases in which
the locale's decimal point character is used and when a period is used.
Some of these features have not been described yet.

Feature     Default        '--posix' or
                           '--use-lc-numeric'
------------------------------------------------------------
'%'g'       Use locale     Use locale
'%g'        Use period     Use locale
Input       Use period     Use locale
'strtonum()'Use period     Use locale

Table 6.1: Locale decimal point versus a period

   Finally, modern-day formal standards and the IEEE standard
floating-point representation can have an unusual but important effect
on the way 'gawk' converts some special string values to numbers.  The
details are presented in *note POSIX Floating Point Problems::.


File: gawk.info,  Node: All Operators,  Next: Truth Values and Conditions,  Prev: Values,  Up: Expressions

6.2 Operators: Doing Something with Values
==========================================

This minor node introduces the "operators" that make use of the values
provided by constants and variables.

* Menu:

* Arithmetic Ops::              Arithmetic operations ('+', '-',
                                etc.)
* Concatenation::               Concatenating strings.
* Assignment Ops::              Changing the value of a variable or a field.
* Increment Ops::               Incrementing the numeric value of a variable.


File: gawk.info,  Node: Arithmetic Ops,  Next: Concatenation,  Up: All Operators

6.2.1 Arithmetic Operators
--------------------------

The 'awk' language uses the common arithmetic operators when evaluating
expressions.  All of these arithmetic operators follow normal precedence
rules and work as you would expect them to.

   The following example uses a file named 'grades', which contains a
list of student names as well as three test scores per student (it's a
small class):

     Pat   100 97 58
     Sandy  84 72 93
     Chris  72 92 89

This program takes the file 'grades' and prints the average of the
scores:

     $ awk '{ sum = $2 + $3 + $4 ; avg = sum / 3
     >        print $1, avg }' grades
     -| Pat 85
     -| Sandy 83
     -| Chris 84.3333

   The following list provides the arithmetic operators in 'awk', in
order from the highest precedence to the lowest:

'X ^ Y'
'X ** Y'
     Exponentiation; X raised to the Y power.  '2 ^ 3' has the value
     eight; the character sequence '**' is equivalent to '^'.  (c.e.)

'- X'
     Negation.

'+ X'
     Unary plus; the expression is converted to a number.

'X * Y'
     Multiplication.

'X / Y'
     Division; because all numbers in 'awk' are floating-point numbers,
     the result is _not_ rounded to an integer--'3 / 4' has the value
     0.75.  (It is a common mistake, especially for C programmers, to
     forget that _all_ numbers in 'awk' are floating point, and that
     division of integer-looking constants produces a real number, not
     an integer.)

'X % Y'
     Remainder; further discussion is provided in the text, just after
     this list.

'X + Y'
     Addition.

'X - Y'
     Subtraction.

   Unary plus and minus have the same precedence, the multiplication
operators all have the same precedence, and addition and subtraction
have the same precedence.

   When computing the remainder of 'X % Y', the quotient is rounded
toward zero to an integer and multiplied by Y.  This result is
subtracted from X; this operation is sometimes known as "trunc-mod."
The following relation always holds:

     b * int(a / b) + (a % b) == a

   One possibly undesirable effect of this definition of remainder is
that 'X % Y' is negative if X is negative.  Thus:

     -17 % 8 = -1

   In other 'awk' implementations, the signedness of the remainder may
be machine-dependent.

     NOTE: The POSIX standard only specifies the use of '^' for
     exponentiation.  For maximum portability, do not use the '**'
     operator.


File: gawk.info,  Node: Concatenation,  Next: Assignment Ops,  Prev: Arithmetic Ops,  Up: All Operators

6.2.2 String Concatenation
--------------------------

     It seemed like a good idea at the time.
                         -- _Brian Kernighan_

   There is only one string operation: concatenation.  It does not have
a specific operator to represent it.  Instead, concatenation is
performed by writing expressions next to one another, with no operator.
For example:

     $ awk '{ print "Field number one: " $1 }' mail-list
     -| Field number one: Amelia
     -| Field number one: Anthony
     ...

   Without the space in the string constant after the ':', the line runs
together.  For example:

     $ awk '{ print "Field number one:" $1 }' mail-list
     -| Field number one:Amelia
     -| Field number one:Anthony
     ...

   Because string concatenation does not have an explicit operator, it
is often necessary to ensure that it happens at the right time by using
parentheses to enclose the items to concatenate.  For example, you might
expect that the following code fragment concatenates 'file' and 'name':

     file = "file"
     name = "name"
     print "something meaningful" > file name

This produces a syntax error with some versions of Unix 'awk'.(1)  It is
necessary to use the following:

     print "something meaningful" > (file name)

   Parentheses should be used around concatenation in all but the most
common contexts, such as on the righthand side of '='.  Be careful about
the kinds of expressions used in string concatenation.  In particular,
the order of evaluation of expressions used for concatenation is
undefined in the 'awk' language.  Consider this example:

     BEGIN {
         a = "don't"
         print (a " " (a = "panic"))
     }

It is not defined whether the second assignment to 'a' happens before or
after the value of 'a' is retrieved for producing the concatenated
value.  The result could be either 'don't panic', or 'panic panic'.

   The precedence of concatenation, when mixed with other operators, is
often counter-intuitive.  Consider this example:

     $ awk 'BEGIN { print -12 " " -24 }'
     -| -12-24

   This "obviously" is concatenating -12, a space, and -24.  But where
did the space disappear to?  The answer lies in the combination of
operator precedences and 'awk''s automatic conversion rules.  To get the
desired result, write the program this way:

     $ awk 'BEGIN { print -12 " " (-24) }'
     -| -12 -24

   This forces 'awk' to treat the '-' on the '-24' as unary.  Otherwise,
it's parsed as follows:

         -12 ('" "' - 24)
     => -12 (0 - 24)
     => -12 (-24)
     => -12-24

   As mentioned earlier, when mixing concatenation with other operators,
_parenthesize_.  Otherwise, you're never quite sure what you'll get.

   ---------- Footnotes ----------

   (1) It happens that BWK 'awk', 'gawk', and 'mawk' all "get it right,"
but you should not rely on this.


File: gawk.info,  Node: Assignment Ops,  Next: Increment Ops,  Prev: Concatenation,  Up: All Operators

6.2.3 Assignment Expressions
----------------------------

An "assignment" is an expression that stores a (usually different) value
into a variable.  For example, let's assign the value one to the
variable 'z':

     z = 1

   After this expression is executed, the variable 'z' has the value
one.  Whatever old value 'z' had before the assignment is forgotten.

   Assignments can also store string values.  For example, the following
stores the value '"this food is good"' in the variable 'message':

     thing = "food"
     predicate = "good"
     message = "this " thing " is " predicate

This also illustrates string concatenation.  The '=' sign is called an
"assignment operator".  It is the simplest assignment operator because
the value of the righthand operand is stored unchanged.  Most operators
(addition, concatenation, and so on) have no effect except to compute a
value.  If the value isn't used, there's no reason to use the operator.
An assignment operator is different; it does produce a value, but even
if you ignore it, the assignment still makes itself felt through the
alteration of the variable.  We call this a "side effect".

   The lefthand operand of an assignment need not be a variable (*note
Variables::); it can also be a field (*note Changing Fields::) or an
array element (*note Arrays::).  These are all called "lvalues", which
means they can appear on the lefthand side of an assignment operator.
The righthand operand may be any expression; it produces the new value
that the assignment stores in the specified variable, field, or array
element.  (Such values are called "rvalues".)

   It is important to note that variables do _not_ have permanent types.
A variable's type is simply the type of whatever value was last assigned
to it.  In the following program fragment, the variable 'foo' has a
numeric value at first, and a string value later on:

     foo = 1
     print foo
     foo = "bar"
     print foo

When the second assignment gives 'foo' a string value, the fact that it
previously had a numeric value is forgotten.

   String values that do not begin with a digit have a numeric value of
zero.  After executing the following code, the value of 'foo' is five:

     foo = "a string"
     foo = foo + 5

     NOTE: Using a variable as a number and then later as a string can
     be confusing and is poor programming style.  The previous two
     examples illustrate how 'awk' works, _not_ how you should write
     your programs!

   An assignment is an expression, so it has a value--the same value
that is assigned.  Thus, 'z = 1' is an expression with the value one.
One consequence of this is that you can write multiple assignments
together, such as:

     x = y = z = 5

This example stores the value five in all three variables ('x', 'y', and
'z').  It does so because the value of 'z = 5', which is five, is stored
into 'y' and then the value of 'y = z = 5', which is five, is stored
into 'x'.

   Assignments may be used anywhere an expression is called for.  For
example, it is valid to write 'x != (y = 1)' to set 'y' to one, and then
test whether 'x' equals one.  But this style tends to make programs hard
to read; such nesting of assignments should be avoided, except perhaps
in a one-shot program.

   Aside from '=', there are several other assignment operators that do
arithmetic with the old value of the variable.  For example, the
operator '+=' computes a new value by adding the righthand value to the
old value of the variable.  Thus, the following assignment adds five to
the value of 'foo':

     foo += 5

This is equivalent to the following:

     foo = foo + 5

Use whichever makes the meaning of your program clearer.

   There are situations where using '+=' (or any assignment operator) is
_not_ the same as simply repeating the lefthand operand in the righthand
expression.  For example:

     # Thanks to Pat Rankin for this example
     BEGIN  {
         foo[rand()] += 5
         for (x in foo)
            print x, foo[x]

         bar[rand()] = bar[rand()] + 5
         for (x in bar)
            print x, bar[x]
     }

The indices of 'bar' are practically guaranteed to be different, because
'rand()' returns different values each time it is called.  (Arrays and
the 'rand()' function haven't been covered yet.  *Note Arrays::, and
*note Numeric Functions:: for more information.)  This example
illustrates an important fact about assignment operators: the lefthand
expression is only evaluated _once_.

   It is up to the implementation as to which expression is evaluated
first, the lefthand or the righthand.  Consider this example:

     i = 1
     a[i += 2] = i + 1

The value of 'a[3]' could be either two or four.

   *note Table 6.2: table-assign-ops. lists the arithmetic assignment
operators.  In each case, the righthand operand is an expression whose
value is converted to a number.

Operator               Effect
--------------------------------------------------------------------------
LVALUE '+='            Add INCREMENT to the value of LVALUE.
INCREMENT
LVALUE '-='            Subtract DECREMENT from the value of LVALUE.
DECREMENT
LVALUE '*='            Multiply the value of LVALUE by COEFFICIENT.
COEFFICIENT
LVALUE '/=' DIVISOR    Divide the value of LVALUE by DIVISOR.
LVALUE '%=' MODULUS    Set LVALUE to its remainder by MODULUS.
LVALUE '^=' POWER      Raise LVALUE to the power POWER.
LVALUE '**=' POWER     Raise LVALUE to the power POWER.  (c.e.)

Table 6.2: Arithmetic assignment operators

     NOTE: Only the '^=' operator is specified by POSIX. For maximum
     portability, do not use the '**=' operator.

      Syntactic Ambiguities Between '/=' and Regular Expressions

   There is a syntactic ambiguity between the '/=' assignment operator
and regexp constants whose first character is an '='.  (d.c.)  This is
most notable in some commercial 'awk' versions.  For example:

     $ awk /==/ /dev/null
     error-> awk: syntax error at source line 1
     error->  context is
     error->         >>> /= <<<
     error-> awk: bailing out at source line 1

A workaround is:

     awk '/[=]=/' /dev/null

   'gawk' does not have this problem; BWK 'awk' and 'mawk' also do not.


File: gawk.info,  Node: Increment Ops,  Prev: Assignment Ops,  Up: All Operators

6.2.4 Increment and Decrement Operators
---------------------------------------

"Increment" and "decrement operators" increase or decrease the value of
a variable by one.  An assignment operator can do the same thing, so the
increment operators add no power to the 'awk' language; however, they
are convenient abbreviations for very common operations.

   The operator used for adding one is written '++'.  It can be used to
increment a variable either before or after taking its value.  To
"pre-increment" a variable 'v', write '++v'.  This adds one to the value
of 'v'--that new value is also the value of the expression.  (The
assignment expression 'v += 1' is completely equivalent.)  Writing the
'++' after the variable specifies "post-increment".  This increments the
variable value just the same; the difference is that the value of the
increment expression itself is the variable's _old_ value.  Thus, if
'foo' has the value four, then the expression 'foo++' has the value
four, but it changes the value of 'foo' to five.  In other words, the
operator returns the old value of the variable, but with the side effect
of incrementing it.

   The post-increment 'foo++' is nearly the same as writing '(foo += 1)
- 1'.  It is not perfectly equivalent because all numbers in 'awk' are
floating point--in floating point, 'foo + 1 - 1' does not necessarily
equal 'foo'.  But the difference is minute as long as you stick to
numbers that are fairly small (less than 10e12).

   Fields and array elements are incremented just like variables.  (Use
'$(i++)' when you want to do a field reference and a variable increment
at the same time.  The parentheses are necessary because of the
precedence of the field reference operator '$'.)

   The decrement operator '--' works just like '++', except that it
subtracts one instead of adding it.  As with '++', it can be used before
the lvalue to pre-decrement or after it to post-decrement.  Following is
a summary of increment and decrement expressions:

'++LVALUE'
     Increment LVALUE, returning the new value as the value of the
     expression.

'LVALUE++'
     Increment LVALUE, returning the _old_ value of LVALUE as the value
     of the expression.

'--LVALUE'
     Decrement LVALUE, returning the new value as the value of the
     expression.  (This expression is like '++LVALUE', but instead of
     adding, it subtracts.)

'LVALUE--'
     Decrement LVALUE, returning the _old_ value of LVALUE as the value
     of the expression.  (This expression is like 'LVALUE++', but
     instead of adding, it subtracts.)

                       Operator Evaluation Order

     Doctor, it hurts when I do this!
     Then don't do that!
                           -- _Groucho Marx_

What happens for something like the following?

     b = 6
     print b += b++

Or something even stranger?

     b = 6
     b += ++b + b++
     print b

   In other words, when do the various side effects prescribed by the
postfix operators ('b++') take effect?  When side effects happen is
"implementation-defined".  In other words, it is up to the particular
version of 'awk'.  The result for the first example may be 12 or 13, and
for the second, it may be 22 or 23.

   In short, doing things like this is not recommended and definitely
not anything that you can rely upon for portability.  You should avoid
such things in your own programs.


File: gawk.info,  Node: Truth Values and Conditions,  Next: Function Calls,  Prev: All Operators,  Up: Expressions

6.3 Truth Values and Conditions
===============================

In certain contexts, expression values also serve as "truth values";
i.e., they determine what should happen next as the program runs.  This
minor node describes how 'awk' defines "true" and "false" and how values
are compared.

* Menu:

* Truth Values::                What is "true" and what is "false".
* Typing and Comparison::       How variables acquire types and how this
                                affects comparison of numbers and strings with
                                '<', etc.
* Boolean Ops::                 Combining comparison expressions using boolean
                                operators '||' ("or"), '&&'
                                ("and") and '!' ("not").
* Conditional Exp::             Conditional expressions select between two
                                subexpressions under control of a third
                                subexpression.


File: gawk.info,  Node: Truth Values,  Next: Typing and Comparison,  Up: Truth Values and Conditions

6.3.1 True and False in 'awk'
-----------------------------

Many programming languages have a special representation for the
concepts of "true" and "false."  Such languages usually use the special
constants 'true' and 'false', or perhaps their uppercase equivalents.
However, 'awk' is different.  It borrows a very simple concept of true
and false from C. In 'awk', any nonzero numeric value _or_ any nonempty
string value is true.  Any other value (zero or the null string, '""')
is false.  The following program prints 'A strange truth value' three
times:

     BEGIN {
        if (3.1415927)
            print "A strange truth value"
        if ("Four Score And Seven Years Ago")
            print "A strange truth value"
        if (j = 57)
            print "A strange truth value"
     }

   There is a surprising consequence of the "nonzero or non-null" rule:
the string constant '"0"' is actually true, because it is non-null.
(d.c.)


File: gawk.info,  Node: Typing and Comparison,  Next: Boolean Ops,  Prev: Truth Values,  Up: Truth Values and Conditions

6.3.2 Variable Typing and Comparison Expressions
------------------------------------------------

     The Guide is definitive.  Reality is frequently inaccurate.
      -- _Douglas Adams, 'The Hitchhiker's Guide to the Galaxy'_

   Unlike in other programming languages, in 'awk' variables do not have
a fixed type.  Instead, they can be either a number or a string,
depending upon the value that is assigned to them.  We look now at how
variables are typed, and how 'awk' compares variables.

* Menu:

* Variable Typing::             String type versus numeric type.
* Comparison Operators::        The comparison operators.
* POSIX String Comparison::     String comparison with POSIX rules.


File: gawk.info,  Node: Variable Typing,  Next: Comparison Operators,  Up: Typing and Comparison

6.3.2.1 String Type versus Numeric Type
.......................................

The POSIX standard introduced the concept of a "numeric string", which
is simply a string that looks like a number--for example, '" +2"'.  This
concept is used for determining the type of a variable.  The type of the
variable is important because the types of two variables determine how
they are compared.  Variable typing follows these rules:

   * A numeric constant or the result of a numeric operation has the
     "numeric" attribute.

   * A string constant or the result of a string operation has the
     "string" attribute.

   * Fields, 'getline' input, 'FILENAME', 'ARGV' elements, 'ENVIRON'
     elements, and the elements of an array created by 'match()',
     'split()', and 'patsplit()' that are numeric strings have the
     "strnum" attribute.  Otherwise, they have the "string" attribute.
     Uninitialized variables also have the "strnum" attribute.

   * Attributes propagate across assignments but are not changed by any
     use.

   The last rule is particularly important.  In the following program,
'a' has numeric type, even though it is later used in a string
operation:

     BEGIN {
          a = 12.345
          b = a " is a cute number"
          print b
     }

   When two operands are compared, either string comparison or numeric
comparison may be used.  This depends upon the attributes of the
operands, according to the following symmetric matrix:

             +-------------------------------
             |       STRING          NUMERIC         STRNUM
     -----+-------------------------------
             |
     STRING  |       string          string          string
             |
     NUMERIC |       string          numeric         numeric
             |
     STRNUM  |       string          numeric         numeric
     -----+-------------------------------

   The basic idea is that user input that looks numeric--and _only_ user
input--should be treated as numeric, even though it is actually made of
characters and is therefore also a string.  Thus, for example, the
string constant '" +3.14"', when it appears in program source code, is a
string--even though it looks numeric--and is _never_ treated as a number
for comparison purposes.

   In short, when one operand is a "pure" string, such as a string
constant, then a string comparison is performed.  Otherwise, a numeric
comparison is performed.

   This point bears additional emphasis: All user input is made of
characters, and so is first and foremost of string type; input strings
that look numeric are additionally given the strnum attribute.  Thus,
the six-character input string ' +3.14' receives the strnum attribute.
In contrast, the eight characters '" +3.14"' appearing in program text
comprise a string constant.  The following examples print '1' when the
comparison between the two different constants is true, and '0'
otherwise:

     $ echo ' +3.14' | awk '{ print($0 == " +3.14") }'    True
     -| 1
     $ echo ' +3.14' | awk '{ print($0 == "+3.14") }'     False
     -| 0
     $ echo ' +3.14' | awk '{ print($0 == "3.14") }'      False
     -| 0
     $ echo ' +3.14' | awk '{ print($0 == 3.14) }'        True
     -| 1
     $ echo ' +3.14' | awk '{ print($1 == " +3.14") }'    False
     -| 0
     $ echo ' +3.14' | awk '{ print($1 == "+3.14") }'     True
     -| 1
     $ echo ' +3.14' | awk '{ print($1 == "3.14") }'      False
     -| 0
     $ echo ' +3.14' | awk '{ print($1 == 3.14) }'        True
     -| 1


File: gawk.info,  Node: Comparison Operators,  Next: POSIX String Comparison,  Prev: Variable Typing,  Up: Typing and Comparison

6.3.2.2 Comparison Operators
............................

"Comparison expressions" compare strings or numbers for relationships
such as equality.  They are written using "relational operators", which
are a superset of those in C. *note Table 6.3: table-relational-ops.
describes them.

Expression         Result
--------------------------------------------------------------------------
X '<' Y            True if X is less than Y
X '<=' Y           True if X is less than or equal to Y
X '>' Y            True if X is greater than Y
X '>=' Y           True if X is greater than or equal to Y
X '==' Y           True if X is equal to Y
X '!=' Y           True if X is not equal to Y
X '~' Y            True if the string X matches the regexp denoted by Y
X '!~' Y           True if the string X does not match the regexp
                   denoted by Y
SUBSCRIPT 'in'     True if the array ARRAY has an element with the
ARRAY              subscript SUBSCRIPT

Table 6.3: Relational operators

   Comparison expressions have the value one if true and zero if false.
When comparing operands of mixed types, numeric operands are converted
to strings using the value of 'CONVFMT' (*note Conversion::).

   Strings are compared by comparing the first character of each, then
the second character of each, and so on.  Thus, '"10"' is less than
'"9"'.  If there are two strings where one is a prefix of the other, the
shorter string is less than the longer one.  Thus, '"abc"' is less than
'"abcd"'.

   It is very easy to accidentally mistype the '==' operator and leave
off one of the '=' characters.  The result is still valid 'awk' code,
but the program does not do what is intended:

     if (a = b)   # oops! should be a == b
        ...
     else
        ...

Unless 'b' happens to be zero or the null string, the 'if' part of the
test always succeeds.  Because the operators are so similar, this kind
of error is very difficult to spot when scanning the source code.

   The following list of expressions illustrates the kinds of
comparisons 'awk' performs, as well as what the result of each
comparison is:

'1.5 <= 2.0'
     Numeric comparison (true)

'"abc" >= "xyz"'
     String comparison (false)

'1.5 != " +2"'
     String comparison (true)

'"1e2" < "3"'
     String comparison (true)

'a = 2; b = "2"'
'a == b'
     String comparison (true)

'a = 2; b = " +2"'
'a == b'
     String comparison (false)

   In this example:

     $ echo 1e2 3 | awk '{ print ($1 < $2) ? "true" : "false" }'
     -| false

the result is 'false' because both '$1' and '$2' are user input.  They
are numeric strings--therefore both have the strnum attribute, dictating
a numeric comparison.  The purpose of the comparison rules and the use
of numeric strings is to attempt to produce the behavior that is "least
surprising," while still "doing the right thing."

   String comparisons and regular expression comparisons are very
different.  For example:

     x == "foo"

has the value one, or is true if the variable 'x' is precisely 'foo'.
By contrast:

     x ~ /foo/

has the value one if 'x' contains 'foo', such as '"Oh, what a fool am
I!"'.

   The righthand operand of the '~' and '!~' operators may be either a
regexp constant ('/'...'/') or an ordinary expression.  In the latter
case, the value of the expression as a string is used as a dynamic
regexp (*note Regexp Usage::; also *note Computed Regexps::).

   A constant regular expression in slashes by itself is also an
expression.  '/REGEXP/' is an abbreviation for the following comparison
expression:

     $0 ~ /REGEXP/

   One special place where '/foo/' is _not_ an abbreviation for '$0 ~
/foo/' is when it is the righthand operand of '~' or '!~'.  *Note Using
Constant Regexps::, where this is discussed in more detail.


File: gawk.info,  Node: POSIX String Comparison,  Prev: Comparison Operators,  Up: Typing and Comparison

6.3.2.3 String Comparison with POSIX Rules
..........................................

The POSIX standard says that string comparison is performed based on the
locale's "collating order".  This is the order in which characters sort,
as defined by the locale (for more discussion, *note Locales::).  This
order is usually very different from the results obtained when doing
straight character-by-character comparison.(1)

   Because this behavior differs considerably from existing practice,
'gawk' only implements it when in POSIX mode (*note Options::).  Here is
an example to illustrate the difference, in an 'en_US.UTF-8' locale:

     $ gawk 'BEGIN { printf("ABC < abc = %s\n",
     >                     ("ABC" < "abc" ? "TRUE" : "FALSE")) }'
     -| ABC < abc = TRUE
     $ gawk --posix 'BEGIN { printf("ABC < abc = %s\n",
     >                             ("ABC" < "abc" ? "TRUE" : "FALSE")) }'
     -| ABC < abc = FALSE

   ---------- Footnotes ----------

   (1) Technically, string comparison is supposed to behave the same way
as if the strings were compared with the C 'strcoll()' function.


File: gawk.info,  Node: Boolean Ops,  Next: Conditional Exp,  Prev: Typing and Comparison,  Up: Truth Values and Conditions

6.3.3 Boolean Expressions
-------------------------

A "Boolean expression" is a combination of comparison expressions or
matching expressions, using the Boolean operators "or" ('||'), "and"
('&&'), and "not" ('!'), along with parentheses to control nesting.  The
truth value of the Boolean expression is computed by combining the truth
values of the component expressions.  Boolean expressions are also
referred to as "logical expressions".  The terms are equivalent.

   Boolean expressions can be used wherever comparison and matching
expressions can be used.  They can be used in 'if', 'while', 'do', and
'for' statements (*note Statements::).  They have numeric values (one if
true, zero if false) that come into play if the result of the Boolean
expression is stored in a variable or used in arithmetic.

   In addition, every Boolean expression is also a valid pattern, so you
can use one as a pattern to control the execution of rules.  The Boolean
operators are:

'BOOLEAN1 && BOOLEAN2'
     True if both BOOLEAN1 and BOOLEAN2 are true.  For example, the
     following statement prints the current input record if it contains
     both 'edu' and 'li':

          if ($0 ~ /edu/ && $0 ~ /li/) print

     The subexpression BOOLEAN2 is evaluated only if BOOLEAN1 is true.
     This can make a difference when BOOLEAN2 contains expressions that
     have side effects.  In the case of '$0 ~ /foo/ && ($2 == bar++)',
     the variable 'bar' is not incremented if there is no substring
     'foo' in the record.

'BOOLEAN1 || BOOLEAN2'
     True if at least one of BOOLEAN1 or BOOLEAN2 is true.  For example,
     the following statement prints all records in the input that
     contain _either_ 'edu' or 'li':

          if ($0 ~ /edu/ || $0 ~ /li/) print

     The subexpression BOOLEAN2 is evaluated only if BOOLEAN1 is false.
     This can make a difference when BOOLEAN2 contains expressions that
     have side effects.  (Thus, this test never really distinguishes
     records that contain both 'edu' and 'li'--as soon as 'edu' is
     matched, the full test succeeds.)

'! BOOLEAN'
     True if BOOLEAN is false.  For example, the following program
     prints 'no home!' in the unusual event that the 'HOME' environment
     variable is not defined:

          BEGIN { if (! ("HOME" in ENVIRON))
                      print "no home!" }

     (The 'in' operator is described in *note Reference to Elements::.)

   The '&&' and '||' operators are called "short-circuit" operators
because of the way they work.  Evaluation of the full expression is
"short-circuited" if the result can be determined partway through its
evaluation.

   Statements that end with '&&' or '||' can be continued simply by
putting a newline after them.  But you cannot put a newline in front of
either of these operators without using backslash continuation (*note
Statements/Lines::).

   The actual value of an expression using the '!' operator is either
one or zero, depending upon the truth value of the expression it is
applied to.  The '!' operator is often useful for changing the sense of
a flag variable from false to true and back again.  For example, the
following program is one way to print lines in between special
bracketing lines:

     $1 == "START"   { interested = ! interested; next }
     interested      { print }
     $1 == "END"     { interested = ! interested; next }

The variable 'interested', as with all 'awk' variables, starts out
initialized to zero, which is also false.  When a line is seen whose
first field is 'START', the value of 'interested' is toggled to true,
using '!'.  The next rule prints lines as long as 'interested' is true.
When a line is seen whose first field is 'END', 'interested' is toggled
back to false.(1)

   Most commonly, the '!' operator is used in the conditions of 'if' and
'while' statements, where it often makes more sense to phrase the logic
in the negative:

     if (! SOME CONDITION || SOME OTHER CONDITION) {
         ... DO WHATEVER PROCESSING ...
     }

     NOTE: The 'next' statement is discussed in *note Next Statement::.
     'next' tells 'awk' to skip the rest of the rules, get the next
     record, and start processing the rules over again at the top.  The
     reason it's there is to avoid printing the bracketing 'START' and
     'END' lines.

   ---------- Footnotes ----------

   (1) This program has a bug; it prints lines starting with 'END'.  How
would you fix it?


File: gawk.info,  Node: Conditional Exp,  Prev: Boolean Ops,  Up: Truth Values and Conditions

6.3.4 Conditional Expressions
-----------------------------

A "conditional expression" is a special kind of expression that has
three operands.  It allows you to use one expression's value to select
one of two other expressions.  The conditional expression in 'awk' is
the same as in the C language, as shown here:

     SELECTOR ? IF-TRUE-EXP : IF-FALSE-EXP

There are three subexpressions.  The first, SELECTOR, is always computed
first.  If it is "true" (not zero or not null), then IF-TRUE-EXP is
computed next, and its value becomes the value of the whole expression.
Otherwise, IF-FALSE-EXP is computed next, and its value becomes the
value of the whole expression.  For example, the following expression
produces the absolute value of 'x':

     x >= 0 ? x : -x

   Each time the conditional expression is computed, only one of
IF-TRUE-EXP and IF-FALSE-EXP is used; the other is ignored.  This is
important when the expressions have side effects.  For example, this
conditional expression examines element 'i' of either array 'a' or array
'b', and increments 'i':

     x == y ? a[i++] : b[i++]

This is guaranteed to increment 'i' exactly once, because each time only
one of the two increment expressions is executed and the other is not.
*Note Arrays::, for more information about arrays.

   As a minor 'gawk' extension, a statement that uses '?:' can be
continued simply by putting a newline after either character.  However,
putting a newline in front of either character does not work without
using backslash continuation (*note Statements/Lines::).  If '--posix'
is specified (*note Options::), this extension is disabled.


File: gawk.info,  Node: Function Calls,  Next: Precedence,  Prev: Truth Values and Conditions,  Up: Expressions

6.4 Function Calls
==================

A "function" is a name for a particular calculation.  This enables you
to ask for it by name at any point in the program.  For example, the
function 'sqrt()' computes the square root of a number.

   A fixed set of functions are "built in", which means they are
available in every 'awk' program.  The 'sqrt()' function is one of
these.  *Note Built-in:: for a list of built-in functions and their
descriptions.  In addition, you can define functions for use in your
program.  *Note User-defined:: for instructions on how to do this.
Finally, 'gawk' lets you write functions in C or C++ that may be called
from your program (*note Dynamic Extensions::).

   The way to use a function is with a "function call" expression, which
consists of the function name followed immediately by a list of
"arguments" in parentheses.  The arguments are expressions that provide
the raw materials for the function's calculations.  When there is more
than one argument, they are separated by commas.  If there are no
arguments, just write '()' after the function name.  The following
examples show function calls with and without arguments:

     sqrt(x^2 + y^2)        one argument
     atan2(y, x)            two arguments
     rand()                 no arguments

     CAUTION: Do not put any space between the function name and the
     opening parenthesis!  A user-defined function name looks just like
     the name of a variable--a space would make the expression look like
     concatenation of a variable with an expression inside parentheses.
     With built-in functions, space before the parenthesis is harmless,
     but it is best not to get into the habit of using space to avoid
     mistakes with user-defined functions.

   Each function expects a particular number of arguments.  For example,
the 'sqrt()' function must be called with a single argument, the number
of which to take the square root:

     sqrt(ARGUMENT)

   Some of the built-in functions have one or more optional arguments.
If those arguments are not supplied, the functions use a reasonable
default value.  *Note Built-in:: for full details.  If arguments are
omitted in calls to user-defined functions, then those arguments are
treated as local variables.  Such local variables act like the empty
string if referenced where a string value is required, and like zero if
referenced where a numeric value is required (*note User-defined::).

   As an advanced feature, 'gawk' provides indirect function calls,
which is a way to choose the function to call at runtime, instead of
when you write the source code to your program.  We defer discussion of
this feature until later; see *note Indirect Calls::.

   Like every other expression, the function call has a value, often
called the "return value", which is computed by the function based on
the arguments you give it.  In this example, the return value of
'sqrt(ARGUMENT)' is the square root of ARGUMENT.  The following program
reads numbers, one number per line, and prints the square root of each
one:

     $ awk '{ print "The square root of", $1, "is", sqrt($1) }'
     1
     -| The square root of 1 is 1
     3
     -| The square root of 3 is 1.73205
     5
     -| The square root of 5 is 2.23607
     Ctrl-d

   A function can also have side effects, such as assigning values to
certain variables or doing I/O. This program shows how the 'match()'
function (*note String Functions::) changes the variables 'RSTART' and
'RLENGTH':

     {
         if (match($1, $2))
             print RSTART, RLENGTH
         else
             print "no match"
     }

Here is a sample run:

     $ awk -f matchit.awk
     aaccdd  c+
     -| 3 2
     foo     bar
     -| no match
     abcdefg e
     -| 5 1


File: gawk.info,  Node: Precedence,  Next: Locales,  Prev: Function Calls,  Up: Expressions

6.5 Operator Precedence (How Operators Nest)
============================================

"Operator precedence" determines how operators are grouped when
different operators appear close by in one expression.  For example, '*'
has higher precedence than '+'; thus, 'a + b * c' means to multiply 'b'
and 'c', and then add 'a' to the product (i.e., 'a + (b * c)').

   The normal precedence of the operators can be overruled by using
parentheses.  Think of the precedence rules as saying where the
parentheses are assumed to be.  In fact, it is wise to always use
parentheses whenever there is an unusual combination of operators,
because other people who read the program may not remember what the
precedence is in this case.  Even experienced programmers occasionally
forget the exact rules, which leads to mistakes.  Explicit parentheses
help prevent any such mistakes.

   When operators of equal precedence are used together, the leftmost
operator groups first, except for the assignment, conditional, and
exponentiation operators, which group in the opposite order.  Thus, 'a -
b + c' groups as '(a - b) + c' and 'a = b = c' groups as 'a = (b = c)'.

   Normally the precedence of prefix unary operators does not matter,
because there is only one way to interpret them: innermost first.  Thus,
'$++i' means '$(++i)' and '++$x' means '++($x)'.  However, when another
operator follows the operand, then the precedence of the unary operators
can matter.  '$x^2' means '($x)^2', but '-x^2' means '-(x^2)', because
'-' has lower precedence than '^', whereas '$' has higher precedence.
Also, operators cannot be combined in a way that violates the precedence
rules; for example, '$$0++--' is not a valid expression because the
first '$' has higher precedence than the '++'; to avoid the problem the
expression can be rewritten as '$($0++)--'.

   This list presents 'awk''s operators, in order of highest to lowest
precedence:

'('...')'
     Grouping.

'$'
     Field reference.

'++ --'
     Increment, decrement.

'^ **'
     Exponentiation.  These operators group right to left.

'+ - !'
     Unary plus, minus, logical "not."

'* / %'
     Multiplication, division, remainder.

'+ -'
     Addition, subtraction.

String concatenation
     There is no special symbol for concatenation.  The operands are
     simply written side by side (*note Concatenation::).

'< <= == != > >= >> | |&'
     Relational and redirection.  The relational operators and the
     redirections have the same precedence level.  Characters such as
     '>' serve both as relationals and as redirections; the context
     distinguishes between the two meanings.

     Note that the I/O redirection operators in 'print' and 'printf'
     statements belong to the statement level, not to expressions.  The
     redirection does not produce an expression that could be the
     operand of another operator.  As a result, it does not make sense
     to use a redirection operator near another operator of lower
     precedence without parentheses.  Such combinations (e.g., 'print
     foo > a ? b : c') result in syntax errors.  The correct way to
     write this statement is 'print foo > (a ? b : c)'.

'~ !~'
     Matching, nonmatching.

'in'
     Array membership.

'&&'
     Logical "and."

'||'
     Logical "or."

'?:'
     Conditional.  This operator groups right to left.

'= += -= *= /= %= ^= **='
     Assignment.  These operators group right to left.

     NOTE: The '|&', '**', and '**=' operators are not specified by
     POSIX. For maximum portability, do not use them.


File: gawk.info,  Node: Locales,  Next: Expressions Summary,  Prev: Precedence,  Up: Expressions

6.6 Where You Are Makes a Difference
====================================

Modern systems support the notion of "locales": a way to tell the system
about the local character set and language.  The ISO C standard defines
a default '"C"' locale, which is an environment that is typical of what
many C programmers are used to.

   Once upon a time, the locale setting used to affect regexp matching,
but this is no longer true (*note Ranges and Locales::).

   Locales can affect record splitting.  For the normal case of 'RS =
"\n"', the locale is largely irrelevant.  For other single-character
record separators, setting 'LC_ALL=C' in the environment will give you
much better performance when reading records.  Otherwise, 'gawk' has to
make several function calls, _per input character_, to find the record
terminator.

   Locales can affect how dates and times are formatted (*note Time
Functions::).  For example, a common way to abbreviate the date
September 4, 2015, in the United States is "9/4/15."  In many countries
in Europe, however, it is abbreviated "4.9.15."  Thus, the '%x'
specification in a '"US"' locale might produce '9/4/15', while in a
'"EUROPE"' locale, it might produce '4.9.15'.

   According to POSIX, string comparison is also affected by locales
(similar to regular expressions).  The details are presented in *note
POSIX String Comparison::.

   Finally, the locale affects the value of the decimal point character
used when 'gawk' parses input data.  This is discussed in detail in
*note Conversion::.


File: gawk.info,  Node: Expressions Summary,  Prev: Locales,  Up: Expressions

6.7 Summary
===========

   * Expressions are the basic elements of computation in programs.
     They are built from constants, variables, function calls, and
     combinations of the various kinds of values with operators.

   * 'awk' supplies three kinds of constants: numeric, string, and
     regexp.  'gawk' lets you specify numeric constants in octal and
     hexadecimal (bases 8 and 16) as well as decimal (base 10).  In
     certain contexts, a standalone regexp constant such as '/foo/' has
     the same meaning as '$0 ~ /foo/'.

   * Variables hold values between uses in computations.  A number of
     built-in variables provide information to your 'awk' program, and a
     number of others let you control how 'awk' behaves.

   * Numbers are automatically converted to strings, and strings to
     numbers, as needed by 'awk'.  Numeric values are converted as if
     they were formatted with 'sprintf()' using the format in 'CONVFMT'.
     Locales can influence the conversions.

   * 'awk' provides the usual arithmetic operators (addition,
     subtraction, multiplication, division, modulus), and unary plus and
     minus.  It also provides comparison operators, Boolean operators,
     an array membership testing operator, and regexp matching
     operators.  String concatenation is accomplished by placing two
     expressions next to each other; there is no explicit operator.  The
     three-operand '?:' operator provides an "if-else" test within
     expressions.

   * Assignment operators provide convenient shorthands for common
     arithmetic operations.

   * In 'awk', a value is considered to be true if it is nonzero _or_
     non-null.  Otherwise, the value is false.

   * A variable's type is set upon each assignment and may change over
     its lifetime.  The type determines how it behaves in comparisons
     (string or numeric).

   * Function calls return a value that may be used as part of a larger
     expression.  Expressions used to pass parameter values are fully
     evaluated before the function is called.  'awk' provides built-in
     and user-defined functions; this is described in *note Functions::.

   * Operator precedence specifies the order in which operations are
     performed, unless explicitly overridden by parentheses.  'awk''s
     operator precedence is compatible with that of C.

   * Locales can affect the format of data as output by an 'awk'
     program, and occasionally the format for data read as input.


File: gawk.info,  Node: Patterns and Actions,  Next: Arrays,  Prev: Expressions,  Up: Top

7 Patterns, Actions, and Variables
**********************************

As you have already seen, each 'awk' statement consists of a pattern
with an associated action.  This major node describes how you build
patterns and actions, what kinds of things you can do within actions,
and 'awk''s predefined variables.

   The pattern-action rules and the statements available for use within
actions form the core of 'awk' programming.  In a sense, everything
covered up to here has been the foundation that programs are built on
top of.  Now it's time to start building something useful.

* Menu:

* Pattern Overview::            What goes into a pattern.
* Using Shell Variables::       How to use shell variables with 'awk'.
* Action Overview::             What goes into an action.
* Statements::                  Describes the various control statements in
                                detail.
* Built-in Variables::          Summarizes the predefined variables.
* Pattern Action Summary::      Patterns and Actions summary.


File: gawk.info,  Node: Pattern Overview,  Next: Using Shell Variables,  Up: Patterns and Actions

7.1 Pattern Elements
====================

* Menu:

* Regexp Patterns::             Using regexps as patterns.
* Expression Patterns::         Any expression can be used as a pattern.
* Ranges::                      Pairs of patterns specify record ranges.
* BEGIN/END::                   Specifying initialization and cleanup rules.
* BEGINFILE/ENDFILE::           Two special patterns for advanced control.
* Empty::                       The empty pattern, which matches every record.

Patterns in 'awk' control the execution of rules--a rule is executed
when its pattern matches the current input record.  The following is a
summary of the types of 'awk' patterns:

'/REGULAR EXPRESSION/'
     A regular expression.  It matches when the text of the input record
     fits the regular expression.  (*Note Regexp::.)

'EXPRESSION'
     A single expression.  It matches when its value is nonzero (if a
     number) or non-null (if a string).  (*Note Expression Patterns::.)

'BEGPAT, ENDPAT'
     A pair of patterns separated by a comma, specifying a "range" of
     records.  The range includes both the initial record that matches
     BEGPAT and the final record that matches ENDPAT.  (*Note Ranges::.)

'BEGIN'
'END'
     Special patterns for you to supply startup or cleanup actions for
     your 'awk' program.  (*Note BEGIN/END::.)

'BEGINFILE'
'ENDFILE'
     Special patterns for you to supply startup or cleanup actions to be
     done on a per-file basis.  (*Note BEGINFILE/ENDFILE::.)

'EMPTY'
     The empty pattern matches every input record.  (*Note Empty::.)


File: gawk.info,  Node: Regexp Patterns,  Next: Expression Patterns,  Up: Pattern Overview

7.1.1 Regular Expressions as Patterns
-------------------------------------

Regular expressions are one of the first kinds of patterns presented in
this book.  This kind of pattern is simply a regexp constant in the
pattern part of a rule.  Its meaning is '$0 ~ /PATTERN/'.  The pattern
matches when the input record matches the regexp.  For example:

     /foo|bar|baz/  { buzzwords++ }
     END            { print buzzwords, "buzzwords seen" }


File: gawk.info,  Node: Expression Patterns,  Next: Ranges,  Prev: Regexp Patterns,  Up: Pattern Overview

7.1.2 Expressions as Patterns
-----------------------------

Any 'awk' expression is valid as an 'awk' pattern.  The pattern matches
if the expression's value is nonzero (if a number) or non-null (if a
string).  The expression is reevaluated each time the rule is tested
against a new input record.  If the expression uses fields such as '$1',
the value depends directly on the new input record's text; otherwise, it
depends on only what has happened so far in the execution of the 'awk'
program.

   Comparison expressions, using the comparison operators described in
*note Typing and Comparison::, are a very common kind of pattern.
Regexp matching and nonmatching are also very common expressions.  The
left operand of the '~' and '!~' operators is a string.  The right
operand is either a constant regular expression enclosed in slashes
('/REGEXP/'), or any expression whose string value is used as a dynamic
regular expression (*note Computed Regexps::).  The following example
prints the second field of each input record whose first field is
precisely 'li':

     $ awk '$1 == "li" { print $2 }' mail-list

(There is no output, because there is no person with the exact name
'li'.)  Contrast this with the following regular expression match, which
accepts any record with a first field that contains 'li':

     $ awk '$1 ~ /li/ { print $2 }' mail-list
     -| 555-5553
     -| 555-6699

   A regexp constant as a pattern is also a special case of an
expression pattern.  The expression '/li/' has the value one if 'li'
appears in the current input record.  Thus, as a pattern, '/li/' matches
any record containing 'li'.

   Boolean expressions are also commonly used as patterns.  Whether the
pattern matches an input record depends on whether its subexpressions
match.  For example, the following command prints all the records in
'mail-list' that contain both 'edu' and 'li':

     $ awk '/edu/ && /li/' mail-list
     -| Samuel       555-3430     samuel.lanceolis@shu.edu        A

   The following command prints all records in 'mail-list' that contain
_either_ 'edu' or 'li' (or both, of course):

     $ awk '/edu/ || /li/' mail-list
     -| Amelia       555-5553     amelia.zodiacusque@gmail.com    F
     -| Broderick    555-0542     broderick.aliquotiens@yahoo.com R
     -| Fabius       555-1234     fabius.undevicesimus@ucb.edu    F
     -| Julie        555-6699     julie.perscrutabor@skeeve.com   F
     -| Samuel       555-3430     samuel.lanceolis@shu.edu        A
     -| Jean-Paul    555-2127     jeanpaul.campanorum@nyu.edu     R

   The following command prints all records in 'mail-list' that do _not_
contain the string 'li':

     $ awk '! /li/' mail-list
     -| Anthony      555-3412     anthony.asserturo@hotmail.com   A
     -| Becky        555-7685     becky.algebrarum@gmail.com      A
     -| Bill         555-1675     bill.drowning@hotmail.com       A
     -| Camilla      555-2912     camilla.infusarum@skynet.be     R
     -| Fabius       555-1234     fabius.undevicesimus@ucb.edu    F
     -| Martin       555-6480     martin.codicibus@hotmail.com    A
     -| Jean-Paul    555-2127     jeanpaul.campanorum@nyu.edu     R

   The subexpressions of a Boolean operator in a pattern can be constant
regular expressions, comparisons, or any other 'awk' expressions.  Range
patterns are not expressions, so they cannot appear inside Boolean
patterns.  Likewise, the special patterns 'BEGIN', 'END', 'BEGINFILE',
and 'ENDFILE', which never match any input record, are not expressions
and cannot appear inside Boolean patterns.

   The precedence of the different operators that can appear in patterns
is described in *note Precedence::.


File: gawk.info,  Node: Ranges,  Next: BEGIN/END,  Prev: Expression Patterns,  Up: Pattern Overview

7.1.3 Specifying Record Ranges with Patterns
--------------------------------------------

A "range pattern" is made of two patterns separated by a comma, in the
form 'BEGPAT, ENDPAT'.  It is used to match ranges of consecutive input
records.  The first pattern, BEGPAT, controls where the range begins,
while ENDPAT controls where the pattern ends.  For example, the
following:

     awk '$1 == "on", $1 == "off"' myfile

prints every record in 'myfile' between 'on'/'off' pairs, inclusive.

   A range pattern starts out by matching BEGPAT against every input
record.  When a record matches BEGPAT, the range pattern is "turned on",
and the range pattern matches this record as well.  As long as the range
pattern stays turned on, it automatically matches every input record
read.  The range pattern also matches ENDPAT against every input record;
when this succeeds, the range pattern is "turned off" again for the
following record.  Then the range pattern goes back to checking BEGPAT
against each record.

   The record that turns on the range pattern and the one that turns it
off both match the range pattern.  If you don't want to operate on these
records, you can write 'if' statements in the rule's action to
distinguish them from the records you are interested in.

   It is possible for a pattern to be turned on and off by the same
record.  If the record satisfies both conditions, then the action is
executed for just that record.  For example, suppose there is text
between two identical markers (e.g., the '%' symbol), each on its own
line, that should be ignored.  A first attempt would be to combine a
range pattern that describes the delimited text with the 'next'
statement (not discussed yet, *note Next Statement::).  This causes
'awk' to skip any further processing of the current record and start
over again with the next input record.  Such a program looks like this:

     /^%$/,/^%$/    { next }
                    { print }

This program fails because the range pattern is both turned on and
turned off by the first line, which just has a '%' on it.  To accomplish
this task, write the program in the following manner, using a flag:

     /^%$/     { skip = ! skip; next }
     skip == 1 { next } # skip lines with `skip' set

   In a range pattern, the comma (',') has the lowest precedence of all
the operators (i.e., it is evaluated last).  Thus, the following program
attempts to combine a range pattern with another, simpler test:

     echo Yes | awk '/1/,/2/ || /Yes/'

   The intent of this program is '(/1/,/2/) || /Yes/'.  However, 'awk'
interprets this as '/1/, (/2/ || /Yes/)'.  This cannot be changed or
worked around; range patterns do not combine with other patterns:

     $ echo Yes | gawk '(/1/,/2/) || /Yes/'
     error-> gawk: cmd. line:1: (/1/,/2/) || /Yes/
     error-> gawk: cmd. line:1:           ^ syntax error

   As a minor point of interest, although it is poor style, POSIX allows
you to put a newline after the comma in a range pattern.  (d.c.)


File: gawk.info,  Node: BEGIN/END,  Next: BEGINFILE/ENDFILE,  Prev: Ranges,  Up: Pattern Overview

7.1.4 The 'BEGIN' and 'END' Special Patterns
--------------------------------------------

All the patterns described so far are for matching input records.  The
'BEGIN' and 'END' special patterns are different.  They supply startup
and cleanup actions for 'awk' programs.  'BEGIN' and 'END' rules must
have actions; there is no default action for these rules because there
is no current record when they run.  'BEGIN' and 'END' rules are often
referred to as "'BEGIN' and 'END' blocks" by longtime 'awk' programmers.

* Menu:

* Using BEGIN/END::             How and why to use BEGIN/END rules.
* I/O And BEGIN/END::           I/O issues in BEGIN/END rules.


File: gawk.info,  Node: Using BEGIN/END,  Next: I/O And BEGIN/END,  Up: BEGIN/END

7.1.4.1 Startup and Cleanup Actions
...................................

A 'BEGIN' rule is executed once only, before the first input record is
read.  Likewise, an 'END' rule is executed once only, after all the
input is read.  For example:

     $ awk '
     > BEGIN { print "Analysis of \"li\"" }
     > /li/  { ++n }
     > END   { print "\"li\" appears in", n, "records." }' mail-list
     -| Analysis of "li"
     -| "li" appears in 4 records.

   This program finds the number of records in the input file
'mail-list' that contain the string 'li'.  The 'BEGIN' rule prints a
title for the report.  There is no need to use the 'BEGIN' rule to
initialize the counter 'n' to zero, as 'awk' does this automatically
(*note Variables::).  The second rule increments the variable 'n' every
time a record containing the pattern 'li' is read.  The 'END' rule
prints the value of 'n' at the end of the run.

   The special patterns 'BEGIN' and 'END' cannot be used in ranges or
with Boolean operators (indeed, they cannot be used with any operators).
An 'awk' program may have multiple 'BEGIN' and/or 'END' rules.  They are
executed in the order in which they appear: all the 'BEGIN' rules at
startup and all the 'END' rules at termination.  'BEGIN' and 'END' rules
may be intermixed with other rules.  This feature was added in the 1987
version of 'awk' and is included in the POSIX standard.  The original
(1978) version of 'awk' required the 'BEGIN' rule to be placed at the
beginning of the program, the 'END' rule to be placed at the end, and
only allowed one of each.  This is no longer required, but it is a good
idea to follow this template in terms of program organization and
readability.

   Multiple 'BEGIN' and 'END' rules are useful for writing library
functions, because each library file can have its own 'BEGIN' and/or
'END' rule to do its own initialization and/or cleanup.  The order in
which library functions are named on the command line controls the order
in which their 'BEGIN' and 'END' rules are executed.  Therefore, you
have to be careful when writing such rules in library files so that the
order in which they are executed doesn't matter.  *Note Options:: for
more information on using library functions.  *Note Library Functions::,
for a number of useful library functions.

   If an 'awk' program has only 'BEGIN' rules and no other rules, then
the program exits after the 'BEGIN' rules are run.(1)  However, if an
'END' rule exists, then the input is read, even if there are no other
rules in the program.  This is necessary in case the 'END' rule checks
the 'FNR' and 'NR' variables.

   ---------- Footnotes ----------

   (1) The original version of 'awk' kept reading and ignoring input
until the end of the file was seen.


File: gawk.info,  Node: I/O And BEGIN/END,  Prev: Using BEGIN/END,  Up: BEGIN/END

7.1.4.2 Input/Output from 'BEGIN' and 'END' Rules
.................................................

There are several (sometimes subtle) points to be aware of when doing
I/O from a 'BEGIN' or 'END' rule.  The first has to do with the value of
'$0' in a 'BEGIN' rule.  Because 'BEGIN' rules are executed before any
input is read, there simply is no input record, and therefore no fields,
when executing 'BEGIN' rules.  References to '$0' and the fields yield a
null string or zero, depending upon the context.  One way to give '$0' a
real value is to execute a 'getline' command without a variable (*note
Getline::).  Another way is simply to assign a value to '$0'.

   The second point is similar to the first, but from the other
direction.  Traditionally, due largely to implementation issues, '$0'
and 'NF' were _undefined_ inside an 'END' rule.  The POSIX standard
specifies that 'NF' is available in an 'END' rule.  It contains the
number of fields from the last input record.  Most probably due to an
oversight, the standard does not say that '$0' is also preserved,
although logically one would think that it should be.  In fact, all of
BWK 'awk', 'mawk', and 'gawk' preserve the value of '$0' for use in
'END' rules.  Be aware, however, that some other implementations and
many older versions of Unix 'awk' do not.

   The third point follows from the first two.  The meaning of 'print'
inside a 'BEGIN' or 'END' rule is the same as always: 'print $0'.  If
'$0' is the null string, then this prints an empty record.  Many
longtime 'awk' programmers use an unadorned 'print' in 'BEGIN' and 'END'
rules, to mean 'print ""', relying on '$0' being null.  Although one
might generally get away with this in 'BEGIN' rules, it is a very bad
idea in 'END' rules, at least in 'gawk'.  It is also poor style, because
if an empty line is needed in the output, the program should print one
explicitly.

   Finally, the 'next' and 'nextfile' statements are not allowed in a
'BEGIN' rule, because the implicit
read-a-record-and-match-against-the-rules loop has not started yet.
Similarly, those statements are not valid in an 'END' rule, because all
the input has been read.  (*Note Next Statement:: and *note Nextfile
Statement::.)


File: gawk.info,  Node: BEGINFILE/ENDFILE,  Next: Empty,  Prev: BEGIN/END,  Up: Pattern Overview

7.1.5 The 'BEGINFILE' and 'ENDFILE' Special Patterns
----------------------------------------------------

This minor node describes a 'gawk'-specific feature.

   Two special kinds of rule, 'BEGINFILE' and 'ENDFILE', give you
"hooks" into 'gawk''s command-line file processing loop.  As with the
'BEGIN' and 'END' rules (*note BEGIN/END::), all 'BEGINFILE' rules in a
program are merged, in the order they are read by 'gawk', and all
'ENDFILE' rules are merged as well.

   The body of the 'BEGINFILE' rules is executed just before 'gawk'
reads the first record from a file.  'FILENAME' is set to the name of
the current file, and 'FNR' is set to zero.

   The 'BEGINFILE' rule provides you the opportunity to accomplish two
tasks that would otherwise be difficult or impossible to perform:

   * You can test if the file is readable.  Normally, it is a fatal
     error if a file named on the command line cannot be opened for
     reading.  However, you can bypass the fatal error and move on to
     the next file on the command line.

     You do this by checking if the 'ERRNO' variable is not the empty
     string; if so, then 'gawk' was not able to open the file.  In this
     case, your program can execute the 'nextfile' statement (*note
     Nextfile Statement::).  This causes 'gawk' to skip the file
     entirely.  Otherwise, 'gawk' exits with the usual fatal error.

   * If you have written extensions that modify the record handling (by
     inserting an "input parser"; *note Input Parsers::), you can invoke
     them at this point, before 'gawk' has started processing the file.
     (This is a _very_ advanced feature, currently used only by the
     'gawkextlib' project (http://sourceforge.net/projects/gawkextlib).)

   The 'ENDFILE' rule is called when 'gawk' has finished processing the
last record in an input file.  For the last input file, it will be
called before any 'END' rules.  The 'ENDFILE' rule is executed even for
empty input files.

   Normally, when an error occurs when reading input in the normal
input-processing loop, the error is fatal.  However, if an 'ENDFILE'
rule is present, the error becomes non-fatal, and instead 'ERRNO' is
set.  This makes it possible to catch and process I/O errors at the
level of the 'awk' program.

   The 'next' statement (*note Next Statement::) is not allowed inside
either a 'BEGINFILE' or an 'ENDFILE' rule.  The 'nextfile' statement is
allowed only inside a 'BEGINFILE' rule, not inside an 'ENDFILE' rule.

   The 'getline' statement (*note Getline::) is restricted inside both
'BEGINFILE' and 'ENDFILE': only redirected forms of 'getline' are
allowed.

   'BEGINFILE' and 'ENDFILE' are 'gawk' extensions.  In most other 'awk'
implementations, or if 'gawk' is in compatibility mode (*note
Options::), they are not special.


File: gawk.info,  Node: Empty,  Prev: BEGINFILE/ENDFILE,  Up: Pattern Overview

7.1.6 The Empty Pattern
-----------------------

An empty (i.e., nonexistent) pattern is considered to match _every_
input record.  For example, the program:

     awk '{ print $1 }' mail-list

prints the first field of every record.


File: gawk.info,  Node: Using Shell Variables,  Next: Action Overview,  Prev: Pattern Overview,  Up: Patterns and Actions

7.2 Using Shell Variables in Programs
=====================================

'awk' programs are often used as components in larger programs written
in shell.  For example, it is very common to use a shell variable to
hold a pattern that the 'awk' program searches for.  There are two ways
to get the value of the shell variable into the body of the 'awk'
program.

   A common method is to use shell quoting to substitute the variable's
value into the program inside the script.  For example, consider the
following program:

     printf "Enter search pattern: "
     read pattern
     awk "/$pattern/ "'{ nmatches++ }
          END { print nmatches, "found" }' /path/to/data

The 'awk' program consists of two pieces of quoted text that are
concatenated together to form the program.  The first part is
double-quoted, which allows substitution of the 'pattern' shell variable
inside the quotes.  The second part is single-quoted.

   Variable substitution via quoting works, but can potentially be
messy.  It requires a good understanding of the shell's quoting rules
(*note Quoting::), and it's often difficult to correctly match up the
quotes when reading the program.

   A better method is to use 'awk''s variable assignment feature (*note
Assignment Options::) to assign the shell variable's value to an 'awk'
variable.  Then use dynamic regexps to match the pattern (*note Computed
Regexps::).  The following shows how to redo the previous example using
this technique:

     printf "Enter search pattern: "
     read pattern
     awk -v pat="$pattern" '$0 ~ pat { nmatches++ }
            END { print nmatches, "found" }' /path/to/data

Now, the 'awk' program is just one single-quoted string.  The assignment
'-v pat="$pattern"' still requires double quotes, in case there is
whitespace in the value of '$pattern'.  The 'awk' variable 'pat' could
be named 'pattern' too, but that would be more confusing.  Using a
variable also provides more flexibility, as the variable can be used
anywhere inside the program--for printing, as an array subscript, or for
any other use--without requiring the quoting tricks at every point in
the program.


File: gawk.info,  Node: Action Overview,  Next: Statements,  Prev: Using Shell Variables,  Up: Patterns and Actions

7.3 Actions
===========

An 'awk' program or script consists of a series of rules and function
definitions interspersed.  (Functions are described later.  *Note
User-defined::.)  A rule contains a pattern and an action, either of
which (but not both) may be omitted.  The purpose of the "action" is to
tell 'awk' what to do once a match for the pattern is found.  Thus, in
outline, an 'awk' program generally looks like this:

     [PATTERN]  '{ ACTION }'
      PATTERN  ['{ ACTION }']
     ...
     'function NAME(ARGS) { ... }'
     ...

   An action consists of one or more 'awk' "statements", enclosed in
braces ('{...}').  Each statement specifies one thing to do.  The
statements are separated by newlines or semicolons.  The braces around
an action must be used even if the action contains only one statement,
or if it contains no statements at all.  However, if you omit the action
entirely, omit the braces as well.  An omitted action is equivalent to
'{ print $0 }':

     /foo/  { }     match 'foo', do nothing -- empty action
     /foo/          match 'foo', print the record -- omitted action

   The following types of statements are supported in 'awk':

Expressions
     Call functions or assign values to variables (*note Expressions::).
     Executing this kind of statement simply computes the value of the
     expression.  This is useful when the expression has side effects
     (*note Assignment Ops::).

Control statements
     Specify the control flow of 'awk' programs.  The 'awk' language
     gives you C-like constructs ('if', 'for', 'while', and 'do') as
     well as a few special ones (*note Statements::).

Compound statements
     Enclose one or more statements in braces.  A compound statement is
     used in order to put several statements together in the body of an
     'if', 'while', 'do', or 'for' statement.

Input statements
     Use the 'getline' command (*note Getline::).  Also supplied in
     'awk' are the 'next' statement (*note Next Statement::) and the
     'nextfile' statement (*note Nextfile Statement::).

Output statements
     Such as 'print' and 'printf'.  *Note Printing::.

Deletion statements
     For deleting array elements.  *Note Delete::.


File: gawk.info,  Node: Statements,  Next: Built-in Variables,  Prev: Action Overview,  Up: Patterns and Actions

7.4 Control Statements in Actions
=================================

"Control statements", such as 'if', 'while', and so on, control the flow
of execution in 'awk' programs.  Most of 'awk''s control statements are
patterned after similar statements in C.

   All the control statements start with special keywords, such as 'if'
and 'while', to distinguish them from simple expressions.  Many control
statements contain other statements.  For example, the 'if' statement
contains another statement that may or may not be executed.  The
contained statement is called the "body".  To include more than one
statement in the body, group them into a single "compound statement"
with braces, separating them with newlines or semicolons.

* Menu:

* If Statement::                Conditionally execute some 'awk'
                                statements.
* While Statement::             Loop until some condition is satisfied.
* Do Statement::                Do specified action while looping until some
                                condition is satisfied.
* For Statement::               Another looping statement, that provides
                                initialization and increment clauses.
* Switch Statement::            Switch/case evaluation for conditional
                                execution of statements based on a value.
* Break Statement::             Immediately exit the innermost enclosing loop.
* Continue Statement::          Skip to the end of the innermost enclosing
                                loop.
* Next Statement::              Stop processing the current input record.
* Nextfile Statement::          Stop processing the current file.
* Exit Statement::              Stop execution of 'awk'.


File: gawk.info,  Node: If Statement,  Next: While Statement,  Up: Statements

7.4.1 The 'if'-'else' Statement
-------------------------------

The 'if'-'else' statement is 'awk''s decision-making statement.  It
looks like this:

     'if (CONDITION) THEN-BODY' ['else ELSE-BODY']

The CONDITION is an expression that controls what the rest of the
statement does.  If the CONDITION is true, THEN-BODY is executed;
otherwise, ELSE-BODY is executed.  The 'else' part of the statement is
optional.  The condition is considered false if its value is zero or the
null string; otherwise, the condition is true.  Refer to the following:

     if (x % 2 == 0)
         print "x is even"
     else
         print "x is odd"

   In this example, if the expression 'x % 2 == 0' is true (i.e., if the
value of 'x' is evenly divisible by two), then the first 'print'
statement is executed; otherwise, the second 'print' statement is
executed.  If the 'else' keyword appears on the same line as THEN-BODY
and THEN-BODY is not a compound statement (i.e., not surrounded by
braces), then a semicolon must separate THEN-BODY from the 'else'.  To
illustrate this, the previous example can be rewritten as:

     if (x % 2 == 0) print "x is even"; else
             print "x is odd"

If the ';' is left out, 'awk' can't interpret the statement and it
produces a syntax error.  Don't actually write programs this way,
because a human reader might fail to see the 'else' if it is not the
first thing on its line.


File: gawk.info,  Node: While Statement,  Next: Do Statement,  Prev: If Statement,  Up: Statements

7.4.2 The 'while' Statement
---------------------------

In programming, a "loop" is a part of a program that can be executed two
or more times in succession.  The 'while' statement is the simplest
looping statement in 'awk'.  It repeatedly executes a statement as long
as a condition is true.  For example:

     while (CONDITION)
       BODY

BODY is a statement called the "body" of the loop, and CONDITION is an
expression that controls how long the loop keeps running.  The first
thing the 'while' statement does is test the CONDITION.  If the
CONDITION is true, it executes the statement BODY.  (The CONDITION is
true when the value is not zero and not a null string.)  After BODY has
been executed, CONDITION is tested again, and if it is still true, BODY
executes again.  This process repeats until the CONDITION is no longer
true.  If the CONDITION is initially false, the body of the loop never
executes and 'awk' continues with the statement following the loop.
This example prints the first three fields of each record, one per line:

     awk '
     {
         i = 1
         while (i <= 3) {
             print $i
             i++
         }
     }' inventory-shipped

The body of this loop is a compound statement enclosed in braces,
containing two statements.  The loop works in the following manner:
first, the value of 'i' is set to one.  Then, the 'while' statement
tests whether 'i' is less than or equal to three.  This is true when 'i'
equals one, so the 'i'th field is printed.  Then the 'i++' increments
the value of 'i' and the loop repeats.  The loop terminates when 'i'
reaches four.

   A newline is not required between the condition and the body;
however, using one makes the program clearer unless the body is a
compound statement or else is very simple.  The newline after the open
brace that begins the compound statement is not required either, but the
program is harder to read without it.


File: gawk.info,  Node: Do Statement,  Next: For Statement,  Prev: While Statement,  Up: Statements

7.4.3 The 'do'-'while' Statement
--------------------------------

The 'do' loop is a variation of the 'while' looping statement.  The 'do'
loop executes the BODY once and then repeats the BODY as long as the
CONDITION is true.  It looks like this:

     do
       BODY
     while (CONDITION)

   Even if the CONDITION is false at the start, the BODY executes at
least once (and only once, unless executing BODY makes CONDITION true).
Contrast this with the corresponding 'while' statement:

     while (CONDITION)
         BODY

This statement does not execute the BODY even once if the CONDITION is
false to begin with.  The following is an example of a 'do' statement:

     {
         i = 1
         do {
             print $0
             i++
         } while (i <= 10)
     }

This program prints each input record 10 times.  However, it isn't a
very realistic example, because in this case an ordinary 'while' would
do just as well.  This situation reflects actual experience; only
occasionally is there a real use for a 'do' statement.


File: gawk.info,  Node: For Statement,  Next: Switch Statement,  Prev: Do Statement,  Up: Statements

7.4.4 The 'for' Statement
-------------------------

The 'for' statement makes it more convenient to count iterations of a
loop.  The general form of the 'for' statement looks like this:

     for (INITIALIZATION; CONDITION; INCREMENT)
       BODY

The INITIALIZATION, CONDITION, and INCREMENT parts are arbitrary 'awk'
expressions, and BODY stands for any 'awk' statement.

   The 'for' statement starts by executing INITIALIZATION.  Then, as
long as the CONDITION is true, it repeatedly executes BODY and then
INCREMENT.  Typically, INITIALIZATION sets a variable to either zero or
one, INCREMENT adds one to it, and CONDITION compares it against the
desired number of iterations.  For example:

     awk '
     {
         for (i = 1; i <= 3; i++)
             print $i
     }' inventory-shipped

This prints the first three fields of each input record, with one field
per line.

   It isn't possible to set more than one variable in the INITIALIZATION
part without using a multiple assignment statement such as 'x = y = 0'.
This makes sense only if all the initial values are equal.  (But it is
possible to initialize additional variables by writing their assignments
as separate statements preceding the 'for' loop.)

   The same is true of the INCREMENT part.  Incrementing additional
variables requires separate statements at the end of the loop.  The C
compound expression, using C's comma operator, is useful in this
context, but it is not supported in 'awk'.

   Most often, INCREMENT is an increment expression, as in the previous
example.  But this is not required; it can be any expression whatsoever.
For example, the following statement prints all the powers of two
between 1 and 100:

     for (i = 1; i <= 100; i *= 2)
         print i

   If there is nothing to be done, any of the three expressions in the
parentheses following the 'for' keyword may be omitted.  Thus,
'for (; x > 0;)' is equivalent to 'while (x > 0)'.  If the CONDITION is
omitted, it is treated as true, effectively yielding an "infinite loop"
(i.e., a loop that never terminates).

   In most cases, a 'for' loop is an abbreviation for a 'while' loop, as
shown here:

     INITIALIZATION
     while (CONDITION) {
       BODY
       INCREMENT
     }

The only exception is when the 'continue' statement (*note Continue
Statement::) is used inside the loop.  Changing a 'for' statement to a
'while' statement in this way can change the effect of the 'continue'
statement inside the loop.

   The 'awk' language has a 'for' statement in addition to a 'while'
statement because a 'for' loop is often both less work to type and more
natural to think of.  Counting the number of iterations is very common
in loops.  It can be easier to think of this counting as part of looping
rather than as something to do inside the loop.

   There is an alternative version of the 'for' loop, for iterating over
all the indices of an array:

     for (i in array)
         DO SOMETHING WITH array[i]

*Note Scanning an Array:: for more information on this version of the
'for' loop.


File: gawk.info,  Node: Switch Statement,  Next: Break Statement,  Prev: For Statement,  Up: Statements

7.4.5 The 'switch' Statement
----------------------------

This minor node describes a 'gawk'-specific feature.  If 'gawk' is in
compatibility mode (*note Options::), it is not available.

   The 'switch' statement allows the evaluation of an expression and the
execution of statements based on a 'case' match.  Case statements are
checked for a match in the order they are defined.  If no suitable
'case' is found, the 'default' section is executed, if supplied.

   Each 'case' contains a single constant, be it numeric, string, or
regexp.  The 'switch' expression is evaluated, and then each 'case''s
constant is compared against the result in turn.  The type of constant
determines the comparison: numeric or string do the usual comparisons.
A regexp constant does a regular expression match against the string
value of the original expression.  The general form of the 'switch'
statement looks like this:

     switch (EXPRESSION) {
     case VALUE OR REGULAR EXPRESSION:
         CASE-BODY
     default:
         DEFAULT-BODY
     }

   Control flow in the 'switch' statement works as it does in C. Once a
match to a given case is made, the case statement bodies execute until a
'break', 'continue', 'next', 'nextfile', or 'exit' is encountered, or
the end of the 'switch' statement itself.  For example:

     while ((c = getopt(ARGC, ARGV, "aksx")) != -1) {
         switch (c) {
         case "a":
             # report size of all files
             all_files = TRUE;
             break
         case "k":
             BLOCK_SIZE = 1024       # 1K block size
             break
         case "s":
             # do sums only
             sum_only = TRUE
             break
         case "x":
             # don't cross filesystems
             fts_flags = or(fts_flags, FTS_XDEV)
             break
         case "?":
         default:
             usage()
             break
         }
     }

   Note that if none of the statements specified here halt execution of
a matched 'case' statement, execution falls through to the next 'case'
until execution halts.  In this example, the 'case' for '"?"' falls
through to the 'default' case, which is to call a function named
'usage()'.  (The 'getopt()' function being called here is described in
*note Getopt Function::.)


File: gawk.info,  Node: Break Statement,  Next: Continue Statement,  Prev: Switch Statement,  Up: Statements

7.4.6 The 'break' Statement
---------------------------

The 'break' statement jumps out of the innermost 'for', 'while', or 'do'
loop that encloses it.  The following example finds the smallest divisor
of any integer, and also identifies prime numbers:

     # find smallest divisor of num
     {
         num = $1
         for (divisor = 2; divisor * divisor <= num; divisor++) {
             if (num % divisor == 0)
                 break
         }
         if (num % divisor == 0)
             printf "Smallest divisor of %d is %d\n", num, divisor
         else
             printf "%d is prime\n", num
     }

   When the remainder is zero in the first 'if' statement, 'awk'
immediately "breaks out" of the containing 'for' loop.  This means that
'awk' proceeds immediately to the statement following the loop and
continues processing.  (This is very different from the 'exit'
statement, which stops the entire 'awk' program.  *Note Exit
Statement::.)

   The following program illustrates how the CONDITION of a 'for' or
'while' statement could be replaced with a 'break' inside an 'if':

     # find smallest divisor of num
     {
         num = $1
         for (divisor = 2; ; divisor++) {
             if (num % divisor == 0) {
                 printf "Smallest divisor of %d is %d\n", num, divisor
                 break
             }
             if (divisor * divisor > num) {
                 printf "%d is prime\n", num
                 break
             }
         }
     }

   The 'break' statement is also used to break out of the 'switch'
statement.  This is discussed in *note Switch Statement::.

   The 'break' statement has no meaning when used outside the body of a
loop or 'switch'.  However, although it was never documented, historical
implementations of 'awk' treated the 'break' statement outside of a loop
as if it were a 'next' statement (*note Next Statement::).  (d.c.)
Recent versions of BWK 'awk' no longer allow this usage, nor does
'gawk'.


File: gawk.info,  Node: Continue Statement,  Next: Next Statement,  Prev: Break Statement,  Up: Statements

7.4.7 The 'continue' Statement
------------------------------

Similar to 'break', the 'continue' statement is used only inside 'for',
'while', and 'do' loops.  It skips over the rest of the loop body,
causing the next cycle around the loop to begin immediately.  Contrast
this with 'break', which jumps out of the loop altogether.

   The 'continue' statement in a 'for' loop directs 'awk' to skip the
rest of the body of the loop and resume execution with the
increment-expression of the 'for' statement.  The following program
illustrates this fact:

     BEGIN {
          for (x = 0; x <= 20; x++) {
              if (x == 5)
                  continue
              printf "%d ", x
          }
          print ""
     }

This program prints all the numbers from 0 to 20--except for 5, for
which the 'printf' is skipped.  Because the increment 'x++' is not
skipped, 'x' does not remain stuck at 5.  Contrast the 'for' loop from
the previous example with the following 'while' loop:

     BEGIN {
          x = 0
          while (x <= 20) {
              if (x == 5)
                  continue
              printf "%d ", x
              x++
          }
          print ""
     }

This program loops forever once 'x' reaches 5, because the increment
('x++') is never reached.

   The 'continue' statement has no special meaning with respect to the
'switch' statement, nor does it have any meaning when used outside the
body of a loop.  Historical versions of 'awk' treated a 'continue'
statement outside a loop the same way they treated a 'break' statement
outside a loop: as if it were a 'next' statement (*note Next
Statement::).  (d.c.)  Recent versions of BWK 'awk' no longer work this
way, nor does 'gawk'.


File: gawk.info,  Node: Next Statement,  Next: Nextfile Statement,  Prev: Continue Statement,  Up: Statements

7.4.8 The 'next' Statement
--------------------------

The 'next' statement forces 'awk' to immediately stop processing the
current record and go on to the next record.  This means that no further
rules are executed for the current record, and the rest of the current
rule's action isn't executed.

   Contrast this with the effect of the 'getline' function (*note
Getline::).  That also causes 'awk' to read the next record immediately,
but it does not alter the flow of control in any way (i.e., the rest of
the current action executes with a new input record).

   At the highest level, 'awk' program execution is a loop that reads an
input record and then tests each rule's pattern against it.  If you
think of this loop as a 'for' statement whose body contains the rules,
then the 'next' statement is analogous to a 'continue' statement.  It
skips to the end of the body of this implicit loop and executes the
increment (which reads another record).

   For example, suppose an 'awk' program works only on records with four
fields, and it shouldn't fail when given bad input.  To avoid
complicating the rest of the program, write a "weed out" rule near the
beginning, in the following manner:

     NF != 4 {
         printf("%s:%d: skipped: NF != 4\n", FILENAME, FNR) > "/dev/stderr"
         next
     }

Because of the 'next' statement, the program's subsequent rules won't
see the bad record.  The error message is redirected to the standard
error output stream, as error messages should be.  For more detail, see
*note Special Files::.

   If the 'next' statement causes the end of the input to be reached,
then the code in any 'END' rules is executed.  *Note BEGIN/END::.

   The 'next' statement is not allowed inside 'BEGINFILE' and 'ENDFILE'
rules.  *Note BEGINFILE/ENDFILE::.

   According to the POSIX standard, the behavior is undefined if the
'next' statement is used in a 'BEGIN' or 'END' rule.  'gawk' treats it
as a syntax error.  Although POSIX does not disallow it, most other
'awk' implementations don't allow the 'next' statement inside function
bodies (*note User-defined::).  Just as with any other 'next' statement,
a 'next' statement inside a function body reads the next record and
starts processing it with the first rule in the program.


File: gawk.info,  Node: Nextfile Statement,  Next: Exit Statement,  Prev: Next Statement,  Up: Statements

7.4.9 The 'nextfile' Statement
------------------------------

The 'nextfile' statement is similar to the 'next' statement.  However,
instead of abandoning processing of the current record, the 'nextfile'
statement instructs 'awk' to stop processing the current data file.

   Upon execution of the 'nextfile' statement, 'FILENAME' is updated to
the name of the next data file listed on the command line, 'FNR' is
reset to one, and processing starts over with the first rule in the
program.  If the 'nextfile' statement causes the end of the input to be
reached, then the code in any 'END' rules is executed.  An exception to
this is when 'nextfile' is invoked during execution of any statement in
an 'END' rule; in this case, it causes the program to stop immediately.
*Note BEGIN/END::.

   The 'nextfile' statement is useful when there are many data files to
process but it isn't necessary to process every record in every file.
Without 'nextfile', in order to move on to the next data file, a program
would have to continue scanning the unwanted records.  The 'nextfile'
statement accomplishes this much more efficiently.

   In 'gawk', execution of 'nextfile' causes additional things to
happen: any 'ENDFILE' rules are executed if 'gawk' is not currently in
an 'END' or 'BEGINFILE' rule, 'ARGIND' is incremented, and any
'BEGINFILE' rules are executed.  ('ARGIND' hasn't been introduced yet.
*Note Built-in Variables::.)

   With 'gawk', 'nextfile' is useful inside a 'BEGINFILE' rule to skip
over a file that would otherwise cause 'gawk' to exit with a fatal
error.  In this case, 'ENDFILE' rules are not executed.  *Note
BEGINFILE/ENDFILE::.

   Although it might seem that 'close(FILENAME)' would accomplish the
same as 'nextfile', this isn't true.  'close()' is reserved for closing
files, pipes, and coprocesses that are opened with redirections.  It is
not related to the main processing that 'awk' does with the files listed
in 'ARGV'.

     NOTE: For many years, 'nextfile' was a common extension.  In
     September 2012, it was accepted for inclusion into the POSIX
     standard.  See the Austin Group website
     (http://austingroupbugs.net/view.php?id=607).

   The current version of BWK 'awk' and 'mawk' also support 'nextfile'.
However, they don't allow the 'nextfile' statement inside function
bodies (*note User-defined::).  'gawk' does; a 'nextfile' inside a
function body reads the first record from the next file and starts
processing it with the first rule in the program, just as any other
'nextfile' statement.


File: gawk.info,  Node: Exit Statement,  Prev: Nextfile Statement,  Up: Statements

7.4.10 The 'exit' Statement
---------------------------

The 'exit' statement causes 'awk' to immediately stop executing the
current rule and to stop processing input; any remaining input is
ignored.  The 'exit' statement is written as follows:

     'exit' [RETURN CODE]

   When an 'exit' statement is executed from a 'BEGIN' rule, the program
stops processing everything immediately.  No input records are read.
However, if an 'END' rule is present, as part of executing the 'exit'
statement, the 'END' rule is executed (*note BEGIN/END::).  If 'exit' is
used in the body of an 'END' rule, it causes the program to stop
immediately.

   An 'exit' statement that is not part of a 'BEGIN' or 'END' rule stops
the execution of any further automatic rules for the current record,
skips reading any remaining input records, and executes the 'END' rule
if there is one.  'gawk' also skips any 'ENDFILE' rules; they do not
execute.

   In such a case, if you don't want the 'END' rule to do its job, set a
variable to a nonzero value before the 'exit' statement and check that
variable in the 'END' rule.  *Note Assert Function:: for an example that
does this.

   If an argument is supplied to 'exit', its value is used as the exit
status code for the 'awk' process.  If no argument is supplied, 'exit'
causes 'awk' to return a "success" status.  In the case where an
argument is supplied to a first 'exit' statement, and then 'exit' is
called a second time from an 'END' rule with no argument, 'awk' uses the
previously supplied exit value.  (d.c.)  *Note Exit Status:: for more
information.

   For example, suppose an error condition occurs that is difficult or
impossible to handle.  Conventionally, programs report this by exiting
with a nonzero status.  An 'awk' program can do this using an 'exit'
statement with a nonzero argument, as shown in the following example:

     BEGIN {
         if (("date" | getline date_now) <= 0) {
             print "Can't get system date" > "/dev/stderr"
             exit 1
         }
         print "current date is", date_now
         close("date")
     }

     NOTE: For full portability, exit values should be between zero and
     126, inclusive.  Negative values, and values of 127 or greater, may
     not produce consistent results across different operating systems.


File: gawk.info,  Node: Built-in Variables,  Next: Pattern Action Summary,  Prev: Statements,  Up: Patterns and Actions

7.5 Predefined Variables
========================

Most 'awk' variables are available to use for your own purposes; they
never change unless your program assigns values to them, and they never
affect anything unless your program examines them.  However, a few
variables in 'awk' have special built-in meanings.  'awk' examines some
of these automatically, so that they enable you to tell 'awk' how to do
certain things.  Others are set automatically by 'awk', so that they
carry information from the internal workings of 'awk' to your program.

   This minor node documents all of 'gawk''s predefined variables, most
of which are also documented in the major nodes describing their areas
of activity.

* Menu:

* User-modified::               Built-in variables that you change to control
                                'awk'.
* Auto-set::                    Built-in variables where 'awk' gives
                                you information.
* ARGC and ARGV::               Ways to use 'ARGC' and 'ARGV'.


File: gawk.info,  Node: User-modified,  Next: Auto-set,  Up: Built-in Variables

7.5.1 Built-in Variables That Control 'awk'
-------------------------------------------

The following is an alphabetical list of variables that you can change
to control how 'awk' does certain things.

   The variables that are specific to 'gawk' are marked with a pound
sign ('#').  These variables are 'gawk' extensions.  In other 'awk'
implementations or if 'gawk' is in compatibility mode (*note Options::),
they are not special.  (Any exceptions are noted in the description of
each variable.)

'BINMODE #'
     On non-POSIX systems, this variable specifies use of binary mode
     for all I/O. Numeric values of one, two, or three specify that
     input files, output files, or all files, respectively, should use
     binary I/O. A numeric value less than zero is treated as zero, and
     a numeric value greater than three is treated as three.
     Alternatively, string values of '"r"' or '"w"' specify that input
     files and output files, respectively, should use binary I/O. A
     string value of '"rw"' or '"wr"' indicates that all files should
     use binary I/O. Any other string value is treated the same as
     '"rw"', but causes 'gawk' to generate a warning message.  'BINMODE'
     is described in more detail in *note PC Using::.  'mawk' (*note
     Other Versions::) also supports this variable, but only using
     numeric values.

'CONVFMT'
     A string that controls the conversion of numbers to strings (*note
     Conversion::).  It works by being passed, in effect, as the first
     argument to the 'sprintf()' function (*note String Functions::).
     Its default value is '"%.6g"'.  'CONVFMT' was introduced by the
     POSIX standard.

'FIELDWIDTHS #'
     A space-separated list of columns that tells 'gawk' how to split
     input with fixed columnar boundaries.  Assigning a value to
     'FIELDWIDTHS' overrides the use of 'FS' and 'FPAT' for field
     splitting.  *Note Constant Size:: for more information.

'FPAT #'
     A regular expression (as a string) that tells 'gawk' to create the
     fields based on text that matches the regular expression.
     Assigning a value to 'FPAT' overrides the use of 'FS' and
     'FIELDWIDTHS' for field splitting.  *Note Splitting By Content::
     for more information.

'FS'
     The input field separator (*note Field Separators::).  The value is
     a single-character string or a multicharacter regular expression
     that matches the separations between fields in an input record.  If
     the value is the null string ('""'), then each character in the
     record becomes a separate field.  (This behavior is a 'gawk'
     extension.  POSIX 'awk' does not specify the behavior when 'FS' is
     the null string.  Nonetheless, some other versions of 'awk' also
     treat '""' specially.)

     The default value is '" "', a string consisting of a single space.
     As a special exception, this value means that any sequence of
     spaces, TABs, and/or newlines is a single separator.(1)  It also
     causes spaces, TABs, and newlines at the beginning and end of a
     record to be ignored.

     You can set the value of 'FS' on the command line using the '-F'
     option:

          awk -F, 'PROGRAM' INPUT-FILES

     If 'gawk' is using 'FIELDWIDTHS' or 'FPAT' for field splitting,
     assigning a value to 'FS' causes 'gawk' to return to the normal,
     'FS'-based field splitting.  An easy way to do this is to simply
     say 'FS = FS', perhaps with an explanatory comment.

'IGNORECASE #'
     If 'IGNORECASE' is nonzero or non-null, then all string comparisons
     and all regular expression matching are case-independent.  This
     applies to regexp matching with '~' and '!~', the 'gensub()',
     'gsub()', 'index()', 'match()', 'patsplit()', 'split()', and
     'sub()' functions, record termination with 'RS', and field
     splitting with 'FS' and 'FPAT'.  However, the value of 'IGNORECASE'
     does _not_ affect array subscripting and it does not affect field
     splitting when using a single-character field separator.  *Note
     Case-sensitivity::.

'LINT #'
     When this variable is true (nonzero or non-null), 'gawk' behaves as
     if the '--lint' command-line option is in effect (*note Options::).
     With a value of '"fatal"', lint warnings become fatal errors.  With
     a value of '"invalid"', only warnings about things that are
     actually invalid are issued.  (This is not fully implemented yet.)
     Any other true value prints nonfatal warnings.  Assigning a false
     value to 'LINT' turns off the lint warnings.

     This variable is a 'gawk' extension.  It is not special in other
     'awk' implementations.  Unlike with the other special variables,
     changing 'LINT' does affect the production of lint warnings, even
     if 'gawk' is in compatibility mode.  Much as the '--lint' and
     '--traditional' options independently control different aspects of
     'gawk''s behavior, the control of lint warnings during program
     execution is independent of the flavor of 'awk' being executed.

'OFMT'
     A string that controls conversion of numbers to strings (*note
     Conversion::) for printing with the 'print' statement.  It works by
     being passed as the first argument to the 'sprintf()' function
     (*note String Functions::).  Its default value is '"%.6g"'.
     Earlier versions of 'awk' used 'OFMT' to specify the format for
     converting numbers to strings in general expressions; this is now
     done by 'CONVFMT'.

'OFS'
     The output field separator (*note Output Separators::).  It is
     output between the fields printed by a 'print' statement.  Its
     default value is '" "', a string consisting of a single space.

'ORS'
     The output record separator.  It is output at the end of every
     'print' statement.  Its default value is '"\n"', the newline
     character.  (*Note Output Separators::.)

'PREC #'
     The working precision of arbitrary-precision floating-point
     numbers, 53 bits by default (*note Setting precision::).

'ROUNDMODE #'
     The rounding mode to use for arbitrary-precision arithmetic on
     numbers, by default '"N"' ('roundTiesToEven' in the IEEE 754
     standard; *note Setting the rounding mode::).

'RS'
     The input record separator.  Its default value is a string
     containing a single newline character, which means that an input
     record consists of a single line of text.  It can also be the null
     string, in which case records are separated by runs of blank lines.
     If it is a regexp, records are separated by matches of the regexp
     in the input text.  (*Note Records::.)

     The ability for 'RS' to be a regular expression is a 'gawk'
     extension.  In most other 'awk' implementations, or if 'gawk' is in
     compatibility mode (*note Options::), just the first character of
     'RS''s value is used.

'SUBSEP'
     The subscript separator.  It has the default value of '"\034"' and
     is used to separate the parts of the indices of a multidimensional
     array.  Thus, the expression 'foo["A", "B"]' really accesses
     'foo["A\034B"]' (*note Multidimensional::).

'TEXTDOMAIN #'
     Used for internationalization of programs at the 'awk' level.  It
     sets the default text domain for specially marked string constants
     in the source text, as well as for the 'dcgettext()',
     'dcngettext()', and 'bindtextdomain()' functions (*note
     Internationalization::).  The default value of 'TEXTDOMAIN' is
     '"messages"'.

   ---------- Footnotes ----------

   (1) In POSIX 'awk', newline does not count as whitespace.


File: gawk.info,  Node: Auto-set,  Next: ARGC and ARGV,  Prev: User-modified,  Up: Built-in Variables

7.5.2 Built-in Variables That Convey Information
------------------------------------------------

The following is an alphabetical list of variables that 'awk' sets
automatically on certain occasions in order to provide information to
your program.

   The variables that are specific to 'gawk' are marked with a pound
sign ('#').  These variables are 'gawk' extensions.  In other 'awk'
implementations or if 'gawk' is in compatibility mode (*note Options::),
they are not special:

'ARGC', 'ARGV'
     The command-line arguments available to 'awk' programs are stored
     in an array called 'ARGV'.  'ARGC' is the number of command-line
     arguments present.  *Note Other Arguments::.  Unlike most 'awk'
     arrays, 'ARGV' is indexed from 0 to 'ARGC' - 1.  In the following
     example:

          $ awk 'BEGIN {
          >         for (i = 0; i < ARGC; i++)
          >             print ARGV[i]
          >      }' inventory-shipped mail-list
          -| awk
          -| inventory-shipped
          -| mail-list

     'ARGV[0]' contains 'awk', 'ARGV[1]' contains 'inventory-shipped',
     and 'ARGV[2]' contains 'mail-list'.  The value of 'ARGC' is three,
     one more than the index of the last element in 'ARGV', because the
     elements are numbered from zero.

     The names 'ARGC' and 'ARGV', as well as the convention of indexing
     the array from 0 to 'ARGC' - 1, are derived from the C language's
     method of accessing command-line arguments.

     The value of 'ARGV[0]' can vary from system to system.  Also, you
     should note that the program text is _not_ included in 'ARGV', nor
     are any of 'awk''s command-line options.  *Note ARGC and ARGV:: for
     information about how 'awk' uses these variables.  (d.c.)

'ARGIND #'
     The index in 'ARGV' of the current file being processed.  Every
     time 'gawk' opens a new data file for processing, it sets 'ARGIND'
     to the index in 'ARGV' of the file name.  When 'gawk' is processing
     the input files, 'FILENAME == ARGV[ARGIND]' is always true.

     This variable is useful in file processing; it allows you to tell
     how far along you are in the list of data files as well as to
     distinguish between successive instances of the same file name on
     the command line.

     While you can change the value of 'ARGIND' within your 'awk'
     program, 'gawk' automatically sets it to a new value when it opens
     the next file.

'ENVIRON'
     An associative array containing the values of the environment.  The
     array indices are the environment variable names; the elements are
     the values of the particular environment variables.  For example,
     'ENVIRON["HOME"]' might be '"/home/arnold"'.  Changing this array
     does not affect the environment passed on to any programs that
     'awk' may spawn via redirection or the 'system()' function.  (In a
     future version of 'gawk', it may do so.)

     Some operating systems may not have environment variables.  On such
     systems, the 'ENVIRON' array is empty (except for
     'ENVIRON["AWKPATH"]' and 'ENVIRON["AWKLIBPATH"]'; *note AWKPATH
     Variable:: and *note AWKLIBPATH Variable::).

'ERRNO #'
     If a system error occurs during a redirection for 'getline', during
     a read for 'getline', or during a 'close()' operation, then 'ERRNO'
     contains a string describing the error.

     In addition, 'gawk' clears 'ERRNO' before opening each command-line
     input file.  This enables checking if the file is readable inside a
     'BEGINFILE' pattern (*note BEGINFILE/ENDFILE::).

     Otherwise, 'ERRNO' works similarly to the C variable 'errno'.
     Except for the case just mentioned, 'gawk' _never_ clears it (sets
     it to zero or '""').  Thus, you should only expect its value to be
     meaningful when an I/O operation returns a failure value, such as
     'getline' returning -1.  You are, of course, free to clear it
     yourself before doing an I/O operation.

'FILENAME'
     The name of the current input file.  When no data files are listed
     on the command line, 'awk' reads from the standard input and
     'FILENAME' is set to '"-"'.  'FILENAME' changes each time a new
     file is read (*note Reading Files::).  Inside a 'BEGIN' rule, the
     value of 'FILENAME' is '""', because there are no input files being
     processed yet.(1)  (d.c.)  Note, though, that using 'getline'
     (*note Getline::) inside a 'BEGIN' rule can give 'FILENAME' a
     value.

'FNR'
     The current record number in the current file.  'awk' increments
     'FNR' each time it reads a new record (*note Records::).  'awk'
     resets 'FNR' to zero each time it starts a new input file.

'NF'
     The number of fields in the current input record.  'NF' is set each
     time a new record is read, when a new field is created, or when
     '$0' changes (*note Fields::).

     Unlike most of the variables described in this node, assigning a
     value to 'NF' has the potential to affect 'awk''s internal
     workings.  In particular, assignments to 'NF' can be used to create
     fields in or remove fields from the current record.  *Note Changing
     Fields::.

'FUNCTAB #'
     An array whose indices and corresponding values are the names of
     all the built-in, user-defined, and extension functions in the
     program.

          NOTE: Attempting to use the 'delete' statement with the
          'FUNCTAB' array causes a fatal error.  Any attempt to assign
          to an element of 'FUNCTAB' also causes a fatal error.

'NR'
     The number of input records 'awk' has processed since the beginning
     of the program's execution (*note Records::).  'awk' increments
     'NR' each time it reads a new record.

'PROCINFO #'
     The elements of this array provide access to information about the
     running 'awk' program.  The following elements (listed
     alphabetically) are guaranteed to be available:

     'PROCINFO["egid"]'
          The value of the 'getegid()' system call.

     'PROCINFO["euid"]'
          The value of the 'geteuid()' system call.

     'PROCINFO["FS"]'
          This is '"FS"' if field splitting with 'FS' is in effect,
          '"FIELDWIDTHS"' if field splitting with 'FIELDWIDTHS' is in
          effect, or '"FPAT"' if field matching with 'FPAT' is in
          effect.

     'PROCINFO["gid"]'
          The value of the 'getgid()' system call.

     'PROCINFO["identifiers"]'
          A subarray, indexed by the names of all identifiers used in
          the text of the 'awk' program.  An "identifier" is simply the
          name of a variable (be it scalar or array), built-in function,
          user-defined function, or extension function.  For each
          identifier, the value of the element is one of the following:

          '"array"'
               The identifier is an array.

          '"builtin"'
               The identifier is a built-in function.

          '"extension"'
               The identifier is an extension function loaded via
               '@load' or '-l'.

          '"scalar"'
               The identifier is a scalar.

          '"untyped"'
               The identifier is untyped (could be used as a scalar or
               an array; 'gawk' doesn't know yet).

          '"user"'
               The identifier is a user-defined function.

          The values indicate what 'gawk' knows about the identifiers
          after it has finished parsing the program; they are _not_
          updated while the program runs.

     'PROCINFO["pgrpid"]'
          The process group ID of the current process.

     'PROCINFO["pid"]'
          The process ID of the current process.

     'PROCINFO["ppid"]'
          The parent process ID of the current process.

     'PROCINFO["strftime"]'
          The default time format string for 'strftime()'.  Assigning a
          new value to this element changes the default.  *Note Time
          Functions::.

     'PROCINFO["uid"]'
          The value of the 'getuid()' system call.

     'PROCINFO["version"]'
          The version of 'gawk'.

     The following additional elements in the array are available to
     provide information about the MPFR and GMP libraries if your
     version of 'gawk' supports arbitrary-precision arithmetic (*note
     Arbitrary Precision Arithmetic::):

     'PROCINFO["gmp_version"]'
          The version of the GNU MP library.

     'PROCINFO["mpfr_version"]'
          The version of the GNU MPFR library.

     'PROCINFO["prec_max"]'
          The maximum precision supported by MPFR.

     'PROCINFO["prec_min"]'
          The minimum precision required by MPFR.

     The following additional elements in the array are available to
     provide information about the version of the extension API, if your
     version of 'gawk' supports dynamic loading of extension functions
     (*note Dynamic Extensions::):

     'PROCINFO["api_major"]'
          The major version of the extension API.

     'PROCINFO["api_minor"]'
          The minor version of the extension API.

     On some systems, there may be elements in the array, '"group1"'
     through '"groupN"' for some N.  N is the number of supplementary
     groups that the process has.  Use the 'in' operator to test for
     these elements (*note Reference to Elements::).

     The following elements allow you to change 'gawk''s behavior:

     'PROCINFO["COMMAND", "pty"]'
          For two-way communication to COMMAND, use a pseudo-tty instead
          of setting up a two-way pipe.  *Note Two-way I/O:: for more
          information.

     'PROCINFO["INPUT_NAME", "READ_TIMEOUT"]'
          Set a timeout for reading from input redirection INPUT_NAME.
          *Note Read Timeout:: for more information.

     'PROCINFO["sorted_in"]'
          If this element exists in 'PROCINFO', its value controls the
          order in which array indices will be processed by 'for (INDX
          in ARRAY)' loops.  This is an advanced feature, so we defer
          the full description until later; see *note Scanning an
          Array::.

'RLENGTH'
     The length of the substring matched by the 'match()' function
     (*note String Functions::).  'RLENGTH' is set by invoking the
     'match()' function.  Its value is the length of the matched string,
     or -1 if no match is found.

'RSTART'
     The start index in characters of the substring that is matched by
     the 'match()' function (*note String Functions::).  'RSTART' is set
     by invoking the 'match()' function.  Its value is the position of
     the string where the matched substring starts, or zero if no match
     was found.

'RT #'
     The input text that matched the text denoted by 'RS', the record
     separator.  It is set every time a record is read.

'SYMTAB #'
     An array whose indices are the names of all defined global
     variables and arrays in the program.  'SYMTAB' makes 'gawk''s
     symbol table visible to the 'awk' programmer.  It is built as
     'gawk' parses the program and is complete before the program starts
     to run.

     The array may be used for indirect access to read or write the
     value of a variable:

          foo = 5
          SYMTAB["foo"] = 4
          print foo    # prints 4

     The 'isarray()' function (*note Type Functions::) may be used to
     test if an element in 'SYMTAB' is an array.  Also, you may not use
     the 'delete' statement with the 'SYMTAB' array.

     You may use an index for 'SYMTAB' that is not a predefined
     identifier:

          SYMTAB["xxx"] = 5
          print SYMTAB["xxx"]

     This works as expected: in this case 'SYMTAB' acts just like a
     regular array.  The only difference is that you can't then delete
     'SYMTAB["xxx"]'.

     The 'SYMTAB' array is more interesting than it looks.  Andrew
     Schorr points out that it effectively gives 'awk' data pointers.
     Consider his example:

          # Indirect multiply of any variable by amount, return result

          function multiply(variable, amount)
          {
              return SYMTAB[variable] *= amount
          }

     You would use it like this:

          BEGIN {
              answer = 10.5
              multiply("answer", 4)
              print "The answer is", answer
          }

     When run, this produces:

          $ gawk -f answer.awk
          -| The answer is 42

          NOTE: In order to avoid severe time-travel paradoxes,(2)
          neither 'FUNCTAB' nor 'SYMTAB' is available as an element
          within the 'SYMTAB' array.

                        Changing 'NR' and 'FNR'

   'awk' increments 'NR' and 'FNR' each time it reads a record, instead
of setting them to the absolute value of the number of records read.
This means that a program can change these variables and their new
values are incremented for each record.  (d.c.)  The following example
shows this:

     $ echo '1
     > 2
     > 3
     > 4' | awk 'NR == 2 { NR = 17 }
     > { print NR }'
     -| 1
     -| 17
     -| 18
     -| 19

Before 'FNR' was added to the 'awk' language (*note V7/SVR3.1::), many
'awk' programs used this feature to track the number of records in a
file by resetting 'NR' to zero when 'FILENAME' changed.

   ---------- Footnotes ----------

   (1) Some early implementations of Unix 'awk' initialized 'FILENAME'
to '"-"', even if there were data files to be processed.  This behavior
was incorrect and should not be relied upon in your programs.

   (2) Not to mention difficult implementation issues.


File: gawk.info,  Node: ARGC and ARGV,  Prev: Auto-set,  Up: Built-in Variables

7.5.3 Using 'ARGC' and 'ARGV'
-----------------------------

*note Auto-set:: presented the following program describing the
information contained in 'ARGC' and 'ARGV':

     $ awk 'BEGIN {
     >        for (i = 0; i < ARGC; i++)
     >            print ARGV[i]
     >      }' inventory-shipped mail-list
     -| awk
     -| inventory-shipped
     -| mail-list

In this example, 'ARGV[0]' contains 'awk', 'ARGV[1]' contains
'inventory-shipped', and 'ARGV[2]' contains 'mail-list'.  Notice that
the 'awk' program is not entered in 'ARGV'.  The other command-line
options, with their arguments, are also not entered.  This includes
variable assignments done with the '-v' option (*note Options::).
Normal variable assignments on the command line _are_ treated as
arguments and do show up in the 'ARGV' array.  Given the following
program in a file named 'showargs.awk':

     BEGIN {
         printf "A=%d, B=%d\n", A, B
         for (i = 0; i < ARGC; i++)
             printf "\tARGV[%d] = %s\n", i, ARGV[i]
     }
     END   { printf "A=%d, B=%d\n", A, B }

Running it produces the following:

     $ awk -v A=1 -f showargs.awk B=2 /dev/null
     -| A=1, B=0
     -|        ARGV[0] = awk
     -|        ARGV[1] = B=2
     -|        ARGV[2] = /dev/null
     -| A=1, B=2

   A program can alter 'ARGC' and the elements of 'ARGV'.  Each time
'awk' reaches the end of an input file, it uses the next element of
'ARGV' as the name of the next input file.  By storing a different
string there, a program can change which files are read.  Use '"-"' to
represent the standard input.  Storing additional elements and
incrementing 'ARGC' causes additional files to be read.

   If the value of 'ARGC' is decreased, that eliminates input files from
the end of the list.  By recording the old value of 'ARGC' elsewhere, a
program can treat the eliminated arguments as something other than file
names.

   To eliminate a file from the middle of the list, store the null
string ('""') into 'ARGV' in place of the file's name.  As a special
feature, 'awk' ignores file names that have been replaced with the null
string.  Another option is to use the 'delete' statement to remove
elements from 'ARGV' (*note Delete::).

   All of these actions are typically done in the 'BEGIN' rule, before
actual processing of the input begins.  *Note Split Program:: and *note
Tee Program:: for examples of each way of removing elements from 'ARGV'.

   To actually get options into an 'awk' program, end the 'awk' options
with '--' and then supply the 'awk' program's options, in the following
manner:

     awk -f myprog.awk -- -v -q file1 file2 ...

   The following fragment processes 'ARGV' in order to examine, and then
remove, the previously mentioned command-line options:

     BEGIN {
         for (i = 1; i < ARGC; i++) {
             if (ARGV[i] == "-v")
                 verbose = 1
             else if (ARGV[i] == "-q")
                 debug = 1
             else if (ARGV[i] ~ /^-./) {
                 e = sprintf("%s: unrecognized option -- %c",
                         ARGV[0], substr(ARGV[i], 2, 1))
                 print e > "/dev/stderr"
             } else
                 break
             delete ARGV[i]
         }
     }

   Ending the 'awk' options with '--' isn't necessary in 'gawk'.  Unless
'--posix' has been specified, 'gawk' silently puts any unrecognized
options into 'ARGV' for the 'awk' program to deal with.  As soon as it
sees an unknown option, 'gawk' stops looking for other options that it
might otherwise recognize.  The previous command line with 'gawk' would
be:

     gawk -f myprog.awk -q -v file1 file2 ...

Because '-q' is not a valid 'gawk' option, it and the following '-v' are
passed on to the 'awk' program.  (*Note Getopt Function:: for an 'awk'
library function that parses command-line options.)

   When designing your program, you should choose options that don't
conflict with 'gawk''s, because it will process any options that it
accepts before passing the rest of the command line on to your program.
Using '#!' with the '-E' option may help (*note Executable Scripts:: and
*note Options::).


File: gawk.info,  Node: Pattern Action Summary,  Prev: Built-in Variables,  Up: Patterns and Actions

7.6 Summary
===========

   * Pattern-action pairs make up the basic elements of an 'awk'
     program.  Patterns are either normal expressions, range
     expressions, or regexp constants; one of the special keywords
     'BEGIN', 'END', 'BEGINFILE', or 'ENDFILE'; or empty.  The action
     executes if the current record matches the pattern.  Empty
     (missing) patterns match all records.

   * I/O from 'BEGIN' and 'END' rules has certain constraints.  This is
     also true, only more so, for 'BEGINFILE' and 'ENDFILE' rules.  The
     latter two give you "hooks" into 'gawk''s file processing, allowing
     you to recover from a file that otherwise would cause a fatal error
     (such as a file that cannot be opened).

   * Shell variables can be used in 'awk' programs by careful use of
     shell quoting.  It is easier to pass a shell variable into 'awk' by
     using the '-v' option and an 'awk' variable.

   * Actions consist of statements enclosed in curly braces.  Statements
     are built up from expressions, control statements, compound
     statements, input and output statements, and deletion statements.

   * The control statements in 'awk' are 'if'-'else', 'while', 'for',
     and 'do'-'while'.  'gawk' adds the 'switch' statement.  There are
     two flavors of 'for' statement: one for performing general looping,
     and the other for iterating through an array.

   * 'break' and 'continue' let you exit early or start the next
     iteration of a loop (or get out of a 'switch').

   * 'next' and 'nextfile' let you read the next record and start over
     at the top of your program or skip to the next input file and start
     over, respectively.

   * The 'exit' statement terminates your program.  When executed from
     an action (or function body), it transfers control to the 'END'
     statements.  From an 'END' statement body, it exits immediately.
     You may pass an optional numeric value to be used as 'awk''s exit
     status.

   * Some predefined variables provide control over 'awk', mainly for
     I/O. Other variables convey information from 'awk' to your program.

   * 'ARGC' and 'ARGV' make the command-line arguments available to your
     program.  Manipulating them from a 'BEGIN' rule lets you control
     how 'awk' will process the provided data files.


File: gawk.info,  Node: Arrays,  Next: Functions,  Prev: Patterns and Actions,  Up: Top

8 Arrays in 'awk'
*****************

An "array" is a table of values called "elements".  The elements of an
array are distinguished by their "indices".  Indices may be either
numbers or strings.

   This major node describes how arrays work in 'awk', how to use array
elements, how to scan through every element in an array, and how to
remove array elements.  It also describes how 'awk' simulates
multidimensional arrays, as well as some of the less obvious points
about array usage.  The major node moves on to discuss 'gawk''s facility
for sorting arrays, and ends with a brief description of 'gawk''s
ability to support true arrays of arrays.

* Menu:

* Array Basics::                The basics of arrays.
* Numeric Array Subscripts::    How to use numbers as subscripts in
                                'awk'.
* Uninitialized Subscripts::    Using Uninitialized variables as subscripts.
* Delete::                      The 'delete' statement removes an element
                                from an array.
* Multidimensional::            Emulating multidimensional arrays in
                                'awk'.
* Arrays of Arrays::            True multidimensional arrays.
* Arrays Summary::              Summary of arrays.


File: gawk.info,  Node: Array Basics,  Next: Numeric Array Subscripts,  Up: Arrays

8.1 The Basics of Arrays
========================

This minor node presents the basics: working with elements in arrays one
at a time, and traversing all of the elements in an array.

* Menu:

* Array Intro::                 Introduction to Arrays
* Reference to Elements::       How to examine one element of an array.
* Assigning Elements::          How to change an element of an array.
* Array Example::               Basic Example of an Array
* Scanning an Array::           A variation of the 'for' statement. It
                                loops through the indices of an array's
                                existing elements.
* Controlling Scanning::        Controlling the order in which arrays are
                                scanned.


File: gawk.info,  Node: Array Intro,  Next: Reference to Elements,  Up: Array Basics

8.1.1 Introduction to Arrays
----------------------------

     Doing linear scans over an associative array is like trying to club
     someone to death with a loaded Uzi.
                            -- _Larry Wall_

   The 'awk' language provides one-dimensional arrays for storing groups
of related strings or numbers.  Every 'awk' array must have a name.
Array names have the same syntax as variable names; any valid variable
name would also be a valid array name.  But one name cannot be used in
both ways (as an array and as a variable) in the same 'awk' program.

   Arrays in 'awk' superficially resemble arrays in other programming
languages, but there are fundamental differences.  In 'awk', it isn't
necessary to specify the size of an array before starting to use it.
Additionally, any number or string, not just consecutive integers, may
be used as an array index.

   In most other languages, arrays must be "declared" before use,
including a specification of how many elements or components they
contain.  In such languages, the declaration causes a contiguous block
of memory to be allocated for that many elements.  Usually, an index in
the array must be a nonnegative integer.  For example, the index zero
specifies the first element in the array, which is actually stored at
the beginning of the block of memory.  Index one specifies the second
element, which is stored in memory right after the first element, and so
on.  It is impossible to add more elements to the array, because it has
room only for as many elements as given in the declaration.  (Some
languages allow arbitrary starting and ending indices--e.g., '15 ..
27'--but the size of the array is still fixed when the array is
declared.)

   A contiguous array of four elements might look like *note Figure 8.1:
figure-array-elements, conceptually, if the element values are eight,
'"foo"', '""', and 30.