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Diffstat (limited to 'doc/gawk.info')
| -rw-r--r-- | doc/gawk.info | 605 |
1 files changed, 306 insertions, 299 deletions
diff --git a/doc/gawk.info b/doc/gawk.info index 7f67d45c..2d75333d 100644 --- a/doc/gawk.info +++ b/doc/gawk.info @@ -9171,37 +9171,35 @@ 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 Using `gawk''s `nextfile' Statement ------------------------------------------ +7.4.9 The `nextfile' Statement +------------------------------ -`gawk' provides the `nextfile' statement, which is similar to the -`next' statement. (c.e.) However, instead of abandoning processing of -the current record, the `nextfile' statement instructs `gawk' to stop -processing the current data file. - - The `nextfile' statement is a `gawk' extension. In most other `awk' -implementations, or if `gawk' is in compatibility mode (*note -Options::), `nextfile' is not special. - - Upon execution of the `nextfile' statement, any `ENDFILE' rules are -executed except in the case as mentioned below, `FILENAME' is updated -to the name of the next data file listed on the command line, `FNR' is -reset to one, `ARGIND' is incremented, any `BEGINFILE' rules are -executed, and processing starts over with the first rule in the program. -(`ARGIND' hasn't been introduced yet. *Note Built-in Variables::.) 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 the `nextfile' is invoked during execution of any statement in an -`END' rule; In this case, it causes the program to stop immediately. +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. -Normally, in order to move on to the next data file, a program has to -continue scanning the unwanted records. The `nextfile' statement -accomplishes this much more efficiently. +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 except in the case as +mentioned below, `ARGIND' is incremented, and any `BEGINFILE' rules are +executed (`ARGIND' hasn't been introduced yet. *Note Built-in +Variables::.) - In addition, `nextfile' is useful inside a `BEGINFILE' rule to skip + 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::. @@ -9212,6 +9210,11 @@ 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 `gawk' extension. As of + 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 the Brian Kernighan's `awk' (*note Other Versions::) also supports `nextfile'. However, it doesn't allow the `nextfile' statement inside function bodies (*note User-defined::). @@ -10355,18 +10358,22 @@ However, if `--lint' is provided on the command line (*note Options::), array is deleted. All the elements of an array may be deleted with a single statement -(c.e.) by leaving off the subscript in the `delete' statement, as -follows: +by leaving off the subscript in the `delete' statement, as follows: delete ARRAY - This ability is a `gawk' extension; it is not available in -compatibility mode (*note Options::). - Using this version of the `delete' statement is about three times more efficient than the equivalent loop that deletes each element one at a time. + NOTE: For many years, using `delete' without a subscript was a + `gawk' extension. As of September, 2012, it was accepted for + inclusion into the POSIX standard. See the Austin Group website + (http://austingroupbugs.net/view.php?id=544). This form of the + `delete' statement is also supported by Brian Kernighan's `awk' + and `mawk', as well as by a number of other implementations (*note + Other Versions::). + The following statement provides a portable but nonobvious way to clear out an array:(1) @@ -26255,7 +26262,7 @@ Index * Brennan, Michael <1>: Other Versions. (line 6) * Brennan, Michael <2>: Simple Sed. (line 25) * Brennan, Michael <3>: Two-way I/O. (line 6) -* Brennan, Michael: Delete. (line 52) +* Brennan, Michael: Delete. (line 56) * Brian Kernighan's awk, extensions <1>: Other Versions. (line 13) * Brian Kernighan's awk, extensions: BTL. (line 6) * Broder, Alan J.: Contributors. (line 88) @@ -27031,7 +27038,7 @@ Index * functions, user-defined, counts: Profiling. (line 129) * functions, user-defined, library of: Library Functions. (line 6) * functions, user-defined, next/nextfile statements and <1>: Nextfile Statement. - (line 44) + (line 47) * functions, user-defined, next/nextfile statements and: Next Statement. (line 45) * G-d: Acknowledgments. (line 83) @@ -27515,7 +27522,7 @@ Index * nextfile statement, BEGINFILE/ENDFILE patterns and: BEGINFILE/ENDFILE. (line 26) * nextfile statement, user-defined functions and: Nextfile Statement. - (line 44) + (line 47) * nexti debugger command: Debugger Execution Control. (line 49) * NF variable <1>: Auto-set. (line 108) @@ -27694,7 +27701,7 @@ Index * portability, close() function and: Close Files And Pipes. (line 81) * portability, data files as single record: Records. (line 180) -* portability, deleting array elements: Delete. (line 52) +* portability, deleting array elements: Delete. (line 56) * portability, example programs: Library Functions. (line 31) * portability, fflush() function and: I/O Functions. (line 29) * portability, functions, defining: Definition Syntax. (line 99) @@ -28103,7 +28110,7 @@ Index * Spencer, Henry: Glossary. (line 12) * split utility: Split Program. (line 6) * split() function: String Functions. (line 315) -* split() function, array elements, deleting: Delete. (line 57) +* split() function, array elements, deleting: Delete. (line 61) * split.awk program: Split Program. (line 30) * sprintf() function <1>: String Functions. (line 380) * sprintf() function: OFMT. (line 15) @@ -28601,269 +28608,269 @@ Node: Break Statement382649 Node: Continue Statement384639 Node: Next Statement386432 Node: Nextfile Statement388822 -Node: Exit Statement391367 -Node: Built-in Variables393783 -Node: User-modified394878 -Ref: User-modified-Footnote-1403233 -Node: Auto-set403295 -Ref: Auto-set-Footnote-1413203 -Node: ARGC and ARGV413408 -Node: Arrays417259 -Node: Array Basics418764 -Node: Array Intro419590 -Node: Reference to Elements423908 -Node: Assigning Elements426178 -Node: Array Example426669 -Node: Scanning an Array428401 -Node: Controlling Scanning430715 -Ref: Controlling Scanning-Footnote-1435648 -Node: Delete435964 -Ref: Delete-Footnote-1438399 -Node: Numeric Array Subscripts438456 -Node: Uninitialized Subscripts440639 -Node: Multi-dimensional442267 -Node: Multi-scanning445361 -Node: Arrays of Arrays446952 -Node: Functions451597 -Node: Built-in452419 -Node: Calling Built-in453497 -Node: Numeric Functions455485 -Ref: Numeric Functions-Footnote-1459317 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