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-rw-r--r--doc/ChangeLog7
-rw-r--r--doc/gawk.18
-rw-r--r--doc/gawk.info798
-rw-r--r--doc/gawk.texi26
-rw-r--r--doc/gawktexi.in26
5 files changed, 452 insertions, 413 deletions
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 8da64d31..00f83725 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -280,7 +280,7 @@
2013-12-26 Arnold D. Robbins <arnold@skeeve.com>
* gawktexi.in: More minor additions / fixes.
- (Bugs): Add John Malmberg for VMS.
+ (Bugs): Add John Malmberg for VMS. Other minor edits.
2013-12-25 Arnold D. Robbins <arnold@skeeve.com>
@@ -354,6 +354,11 @@
* gawktexi.in (FN, FFN, DF,DDF, PVERSION, CTL): Remove macros.
They have no alternate versions and are just in the way.
+2013-08-15 Arnold D. Robbins <arnold@skeeve.com>
+
+ * gawk.1: Document that ENVIRON updates affect the environment.
+ * gawktexi.in: Ditto.
+
2013-06-27 Arnold D. Robbins <arnold@skeeve.com>
* texinfo.tex: Update from Karl, fixes a formating problem.
diff --git a/doc/gawk.1 b/doc/gawk.1
index c7646557..e3275e87 100644
--- a/doc/gawk.1
+++ b/doc/gawk.1
@@ -917,11 +917,17 @@ An array containing the values of the current environment.
The array is indexed by the environment variables, each element being
the value of that variable (e.g., \fBENVIRON["HOME"]\fP might be
\fB"/home/arnold"\fR).
-Changing this array does not affect the environment seen by programs which
+.sp
+In POSIX mode,
+changing this array does not affect the environment seen by programs which
.I gawk
spawns via redirection or the
.B system()
function.
+Otherwise,
+.I gawk
+updates its real environment so that programs it spawns see
+the changes.
.TP
.B ERRNO
If a system error occurs either doing a redirection for
diff --git a/doc/gawk.info b/doc/gawk.info
index 0fb3d400..af2643b7 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -10128,10 +10128,18 @@ Options::), they are not special.
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.)
+ example, `ENVIRON["HOME"]' might be `/home/arnold'.
+
+ For POSIX `awk', changing this array does not affect the
+ environment passed on to any programs that `awk' may spawn via
+ redirection or the `system()' function.
+
+ However, beginning with version 4.2, if not in POSIX compatibility
+ mode, `gawk' does update its own environment when `ENVIRON' is
+ changed, thus changing the environment seen by programs that it
+ creates. You should therefore be especially careful if you modify
+ `ENVIRON["PATH"]"', which is the search path for finding
+ executable programs.
Some operating systems may not have environment variables. On
such systems, the `ENVIRON' array is empty (except for
@@ -31713,9 +31721,9 @@ Index
* dark corner, exit statement: Exit Statement. (line 30)
* dark corner, field separators: Field Splitting Summary.
(line 46)
-* dark corner, FILENAME variable <1>: Auto-set. (line 90)
+* dark corner, FILENAME variable <1>: Auto-set. (line 98)
* dark corner, FILENAME variable: Getline Notes. (line 19)
-* dark corner, FNR/NR variables: Auto-set. (line 301)
+* dark corner, FNR/NR variables: Auto-set. (line 309)
* dark corner, format-control characters: Control Letters. (line 18)
* dark corner, FS as null string: Single Character Fields.
(line 20)
@@ -31899,12 +31907,12 @@ Index
(line 81)
* differences in awk and gawk, command line directories: Command line directories.
(line 6)
-* differences in awk and gawk, ERRNO variable: Auto-set. (line 74)
+* differences in awk and gawk, ERRNO variable: Auto-set. (line 82)
* differences in awk and gawk, error messages: Special FD. (line 16)
* differences in awk and gawk, FIELDWIDTHS variable: User-modified.
(line 37)
* differences in awk and gawk, FPAT variable: User-modified. (line 43)
-* differences in awk and gawk, FUNCTAB variable: Auto-set. (line 115)
+* differences in awk and gawk, FUNCTAB variable: Auto-set. (line 123)
* differences in awk and gawk, function arguments (gawk): Calling Built-in.
(line 16)
* differences in awk and gawk, getline command: Getline. (line 19)
@@ -31927,7 +31935,7 @@ Index
(line 260)
* differences in awk and gawk, print/printf statements: Format Modifiers.
(line 13)
-* differences in awk and gawk, PROCINFO array: Auto-set. (line 128)
+* differences in awk and gawk, PROCINFO array: Auto-set. (line 136)
* differences in awk and gawk, read timeouts: Read Timeout. (line 6)
* differences in awk and gawk, record separators: awk split records.
(line 124)
@@ -31937,7 +31945,7 @@ Index
(line 26)
* differences in awk and gawk, RS/RT variables: gawk split records.
(line 58)
-* differences in awk and gawk, RT variable: Auto-set. (line 257)
+* differences in awk and gawk, RT variable: Auto-set. (line 265)
* differences in awk and gawk, single-character fields: Single Character Fields.
(line 6)
* differences in awk and gawk, split() function: String Functions.
@@ -31945,7 +31953,7 @@ Index
* differences in awk and gawk, strings: Scalar Constants. (line 20)
* differences in awk and gawk, strings, storing: gawk split records.
(line 77)
-* differences in awk and gawk, SYMTAB variable: Auto-set. (line 261)
+* differences in awk and gawk, SYMTAB variable: Auto-set. (line 269)
* differences in awk and gawk, TEXTDOMAIN variable: User-modified.
(line 152)
* differences in awk and gawk, trunc-mod operation: Arithmetic Ops.
@@ -31985,8 +31993,8 @@ Index
* dynamically loaded extensions: Dynamic Extensions. (line 6)
* e debugger command (alias for enable): Breakpoint Control. (line 73)
* EBCDIC: Ordinal Functions. (line 45)
-* effective group ID of gawk user: Auto-set. (line 133)
-* effective user ID of gawk user: Auto-set. (line 137)
+* effective group ID of gawk user: Auto-set. (line 141)
+* effective user ID of gawk user: Auto-set. (line 145)
* egrep utility <1>: Egrep Program. (line 6)
* egrep utility: Bracket Expressions. (line 24)
* egrep.awk program: Egrep Program. (line 54)
@@ -32042,13 +32050,13 @@ Index
(line 11)
* EREs (Extended Regular Expressions): Bracket Expressions. (line 24)
* ERRNO variable <1>: TCP/IP Networking. (line 54)
-* ERRNO variable: Auto-set. (line 74)
+* ERRNO variable: Auto-set. (line 82)
* ERRNO variable, with BEGINFILE pattern: BEGINFILE/ENDFILE. (line 26)
* ERRNO variable, with close() function: Close Files And Pipes.
(line 139)
* ERRNO variable, with getline command: Getline. (line 19)
* error handling: Special FD. (line 16)
-* error handling, ERRNO variable and: Auto-set. (line 74)
+* error handling, ERRNO variable and: Auto-set. (line 82)
* error output: Special FD. (line 6)
* escape processing, gsub()/gensub()/sub() functions: Gory Details.
(line 6)
@@ -32102,7 +32110,7 @@ Index
(line 6)
* extension API version: Extension Versioning.
(line 6)
-* extension API, version number: Auto-set. (line 224)
+* extension API, version number: Auto-set. (line 232)
* extension example: Extension Example. (line 6)
* extension registration: Registration Functions.
(line 6)
@@ -32181,7 +32189,7 @@ Index
* file names, distinguishing: Auto-set. (line 56)
* file names, in compatibility mode: Special Caveats. (line 9)
* file names, standard streams in gawk: Special FD. (line 46)
-* FILENAME variable <1>: Auto-set. (line 90)
+* FILENAME variable <1>: Auto-set. (line 98)
* FILENAME variable: Reading Files. (line 6)
* FILENAME variable, getline, setting with: Getline Notes. (line 19)
* filenames, assignments as: Ignoring Assigns. (line 6)
@@ -32249,9 +32257,9 @@ Index
* flush buffered output: I/O Functions. (line 28)
* fnmatch() extension function: Extension Sample Fnmatch.
(line 12)
-* FNR variable <1>: Auto-set. (line 99)
+* FNR variable <1>: Auto-set. (line 107)
* FNR variable: Records. (line 6)
-* FNR variable, changing: Auto-set. (line 301)
+* FNR variable, changing: Auto-set. (line 309)
* for statement: For Statement. (line 6)
* for statement, looping over arrays: Scanning an Array. (line 20)
* fork() extension function: Extension Sample Fork.
@@ -32301,7 +32309,7 @@ Index
* FSF (Free Software Foundation): Manual History. (line 6)
* fts() extension function: Extension Sample File Functions.
(line 61)
-* FUNCTAB array: Auto-set. (line 115)
+* FUNCTAB array: Auto-set. (line 123)
* function calls: Function Calls. (line 6)
* function calls, indirect: Indirect Calls. (line 6)
* function definition example: Function Example. (line 6)
@@ -32351,7 +32359,7 @@ Index
* G-d: Acknowledgments. (line 78)
* Garfinkle, Scott: Contributors. (line 34)
* gawk program, dynamic profiling: Profiling. (line 179)
-* gawk version: Auto-set. (line 199)
+* gawk version: Auto-set. (line 207)
* gawk, ARGIND variable in: Other Arguments. (line 12)
* gawk, awk and <1>: This Manual. (line 14)
* gawk, awk and: Preface. (line 23)
@@ -32372,7 +32380,7 @@ Index
* gawk, distribution: Distribution contents.
(line 6)
* gawk, ERRNO variable in <1>: TCP/IP Networking. (line 54)
-* gawk, ERRNO variable in <2>: Auto-set. (line 74)
+* gawk, ERRNO variable in <2>: Auto-set. (line 82)
* gawk, ERRNO variable in <3>: BEGINFILE/ENDFILE. (line 26)
* gawk, ERRNO variable in <4>: Close Files And Pipes.
(line 139)
@@ -32389,7 +32397,7 @@ Index
* gawk, FPAT variable in <1>: User-modified. (line 43)
* gawk, FPAT variable in: Splitting By Content.
(line 27)
-* gawk, FUNCTAB array in: Auto-set. (line 115)
+* gawk, FUNCTAB array in: Auto-set. (line 123)
* gawk, function arguments and: Calling Built-in. (line 16)
* gawk, hexadecimal numbers and: Nondecimal-numbers. (line 42)
* gawk, IGNORECASE variable in <1>: Array Sorting Functions.
@@ -32420,7 +32428,7 @@ Index
* gawk, OS/2 version of: PC Using. (line 16)
* gawk, PROCINFO array in <1>: Two-way I/O. (line 117)
* gawk, PROCINFO array in <2>: Time Functions. (line 47)
-* gawk, PROCINFO array in: Auto-set. (line 128)
+* gawk, PROCINFO array in: Auto-set. (line 136)
* gawk, regexp constants and: Using Constant Regexps.
(line 28)
* gawk, regular expressions, case sensitivity: Case-sensitivity.
@@ -32428,14 +32436,14 @@ Index
* gawk, regular expressions, operators: GNU Regexp Operators.
(line 6)
* gawk, regular expressions, precedence: Regexp Operators. (line 162)
-* gawk, RT variable in <1>: Auto-set. (line 257)
+* gawk, RT variable in <1>: Auto-set. (line 265)
* gawk, RT variable in <2>: Multiple Line. (line 129)
* gawk, RT variable in: awk split records. (line 124)
* gawk, See Also awk: Preface. (line 36)
* gawk, source code, obtaining: Getting. (line 6)
* gawk, splitting fields and: Constant Size. (line 88)
* gawk, string-translation functions: I18N Functions. (line 6)
-* gawk, SYMTAB array in: Auto-set. (line 261)
+* gawk, SYMTAB array in: Auto-set. (line 269)
* gawk, TEXTDOMAIN variable in: User-modified. (line 152)
* gawk, timestamps: Time Functions. (line 6)
* gawk, uses for: Preface. (line 36)
@@ -32521,7 +32529,7 @@ Index
* Grigera, Juan: Contributors. (line 57)
* group database, reading: Group Functions. (line 6)
* group file: Group Functions. (line 6)
-* group ID of gawk user: Auto-set. (line 172)
+* group ID of gawk user: Auto-set. (line 180)
* groups, information about: Group Functions. (line 6)
* gsub <1>: String Functions. (line 139)
* gsub: Using Constant Regexps.
@@ -32812,7 +32820,7 @@ Index
* mawk utility <3>: Concatenation. (line 36)
* mawk utility <4>: Getline/Pipe. (line 62)
* mawk utility: Escape Sequences. (line 124)
-* maximum precision supported by MPFR library: Auto-set. (line 213)
+* maximum precision supported by MPFR library: Auto-set. (line 221)
* McIlroy, Doug: Glossary. (line 149)
* McPhee, Patrick: Contributors. (line 100)
* message object files: Explaining gettext. (line 42)
@@ -32825,7 +32833,7 @@ Index
* messages from extensions: Printing Messages. (line 6)
* metacharacters in regular expressions: Regexp Operators. (line 6)
* metacharacters, escape sequences for: Escape Sequences. (line 130)
-* minimum precision supported by MPFR library: Auto-set. (line 216)
+* minimum precision supported by MPFR library: Auto-set. (line 224)
* mktime: Time Functions. (line 25)
* modifiers, in format specifiers: Format Modifiers. (line 6)
* monetary information, localization: Explaining gettext. (line 104)
@@ -32877,7 +32885,7 @@ Index
(line 47)
* nexti debugger command: Debugger Execution Control.
(line 49)
-* NF variable <1>: Auto-set. (line 104)
+* NF variable <1>: Auto-set. (line 112)
* NF variable: Fields. (line 33)
* NF variable, decrementing: Changing Fields. (line 107)
* ni debugger command (alias for nexti): Debugger Execution Control.
@@ -32886,9 +32894,9 @@ Index
* non-existent array elements: Reference to Elements.
(line 23)
* not Boolean-logic operator: Boolean Ops. (line 6)
-* NR variable <1>: Auto-set. (line 123)
+* NR variable <1>: Auto-set. (line 131)
* NR variable: Records. (line 6)
-* NR variable, changing: Auto-set. (line 301)
+* NR variable, changing: Auto-set. (line 309)
* null strings <1>: Basic Data Typing. (line 26)
* null strings <2>: Truth Values. (line 6)
* null strings <3>: Regexp Field Splitting.
@@ -33002,7 +33010,7 @@ Index
* p debugger command (alias for print): Viewing And Changing Data.
(line 36)
* Papadopoulos, Panos: Contributors. (line 129)
-* parent process ID of gawk process: Auto-set. (line 181)
+* parent process ID of gawk process: Auto-set. (line 189)
* parentheses (), in a profile: Profiling. (line 146)
* parentheses (), regexp operator: Regexp Operators. (line 80)
* password file: Passwd Functions. (line 16)
@@ -33165,24 +33173,24 @@ Index
* printing, unduplicated lines of text: Uniq Program. (line 6)
* printing, user information: Id Program. (line 6)
* private variables: Library Names. (line 11)
-* process group idIDof gawk process: Auto-set. (line 175)
-* process ID of gawk process: Auto-set. (line 178)
+* process group idIDof gawk process: Auto-set. (line 183)
+* process ID of gawk process: Auto-set. (line 186)
* processes, two-way communications with: Two-way I/O. (line 23)
* processing data: Basic High Level. (line 6)
* PROCINFO array <1>: Passwd Functions. (line 6)
* PROCINFO array <2>: Time Functions. (line 47)
-* PROCINFO array: Auto-set. (line 128)
+* PROCINFO array: Auto-set. (line 136)
* PROCINFO array, and communications via ptys: Two-way I/O. (line 117)
* PROCINFO array, and group membership: Group Functions. (line 6)
* PROCINFO array, and user and group ID numbers: Id Program. (line 15)
* PROCINFO array, testing the field splitting: Passwd Functions.
(line 161)
-* PROCINFO array, uses: Auto-set. (line 234)
+* PROCINFO array, uses: Auto-set. (line 242)
* PROCINFO, values of sorted_in: Controlling Scanning.
(line 26)
* profiling awk programs: Profiling. (line 6)
* profiling awk programs, dynamically: Profiling. (line 179)
-* program identifiers: Auto-set. (line 146)
+* program identifiers: Auto-set. (line 154)
* program, definition of: Getting Started. (line 21)
* programmers, attractiveness of: Two-way I/O. (line 6)
* programming conventions, --non-decimal-data option: Nondecimal Data.
@@ -33342,7 +33350,7 @@ Index
* right shift: Bitwise Functions. (line 52)
* right shift, bitwise: Bitwise Functions. (line 32)
* Ritchie, Dennis: Basic Data Typing. (line 54)
-* RLENGTH variable: Auto-set. (line 244)
+* RLENGTH variable: Auto-set. (line 252)
* RLENGTH variable, match() function and: String Functions. (line 224)
* Robbins, Arnold <1>: Future Extensions. (line 6)
* Robbins, Arnold <2>: Bugs. (line 32)
@@ -33368,9 +33376,9 @@ Index
* RS variable: awk split records. (line 12)
* RS variable, multiline records and: Multiple Line. (line 17)
* rshift: Bitwise Functions. (line 52)
-* RSTART variable: Auto-set. (line 250)
+* RSTART variable: Auto-set. (line 258)
* RSTART variable, match() function and: String Functions. (line 224)
-* RT variable <1>: Auto-set. (line 257)
+* RT variable <1>: Auto-set. (line 265)
* RT variable <2>: Multiple Line. (line 129)
* RT variable: awk split records. (line 124)
* Rubin, Paul <1>: Contributors. (line 15)
@@ -33390,7 +33398,7 @@ Index
* scanning arrays: Scanning an Array. (line 6)
* scanning multidimensional arrays: Multiscanning. (line 11)
* Schorr, Andrew <1>: Contributors. (line 134)
-* Schorr, Andrew <2>: Auto-set. (line 284)
+* Schorr, Andrew <2>: Auto-set. (line 292)
* Schorr, Andrew: Acknowledgments. (line 60)
* Schreiber, Bert: Acknowledgments. (line 38)
* Schreiber, Rita: Acknowledgments. (line 38)
@@ -33475,7 +33483,7 @@ Index
(line 110)
* sidebar, Changing FS Does Not Affect the Fields: Field Splitting Summary.
(line 38)
-* sidebar, Changing NR and FNR: Auto-set. (line 299)
+* sidebar, Changing NR and FNR: Auto-set. (line 307)
* sidebar, Controlling Output Buffering with system(): I/O Functions.
(line 138)
* sidebar, Escape Sequences for Metacharacters: Escape Sequences.
@@ -33636,9 +33644,9 @@ Index
* substr: String Functions. (line 479)
* substring: String Functions. (line 479)
* Sumner, Andrew: Other Versions. (line 64)
-* supplementary groups of gawk process: Auto-set. (line 229)
+* supplementary groups of gawk process: Auto-set. (line 237)
* switch statement: Switch Statement. (line 6)
-* SYMTAB array: Auto-set. (line 261)
+* SYMTAB array: Auto-set. (line 269)
* syntactic ambiguity: /= operator vs. /=.../ regexp constant: Assignment Ops.
(line 148)
* system: I/O Functions. (line 75)
@@ -33816,10 +33824,10 @@ Index
* variables, uninitialized, as array subscripts: Uninitialized Subscripts.
(line 6)
* variables, user-defined: Variables. (line 6)
-* version of gawk: Auto-set. (line 199)
-* version of gawk extension API: Auto-set. (line 224)
-* version of GNU MP library: Auto-set. (line 210)
-* version of GNU MPFR library: Auto-set. (line 206)
+* version of gawk: Auto-set. (line 207)
+* version of gawk extension API: Auto-set. (line 232)
+* version of GNU MP library: Auto-set. (line 218)
+* version of GNU MPFR library: Auto-set. (line 214)
* vertical bar (|): Regexp Operators. (line 70)
* vertical bar (|), | operator (I/O) <1>: Precedence. (line 65)
* vertical bar (|), | operator (I/O): Getline/Pipe. (line 9)
@@ -34105,351 +34113,351 @@ Node: Built-in Variables422572
Node: User-modified423699
Ref: User-modified-Footnote-1431388
Node: Auto-set431450
-Ref: Auto-set-Footnote-1444032
-Ref: Auto-set-Footnote-2444237
-Node: ARGC and ARGV444293
-Node: Pattern Action Summary448147
-Node: Arrays450370
-Node: Array Basics451919
-Node: Array Intro452745
-Ref: figure-array-elements454718
-Node: Reference to Elements457125
-Node: Assigning Elements459398
-Node: Array Example459889
-Node: Scanning an Array461621
-Node: Controlling Scanning464636
-Ref: Controlling Scanning-Footnote-1469809
-Node: Delete470125
-Ref: Delete-Footnote-1472890
-Node: Numeric Array Subscripts472947
-Node: Uninitialized Subscripts475130
-Node: Multidimensional476755
-Node: Multiscanning479848
-Node: Arrays of Arrays481437
-Node: Arrays Summary486100
-Node: Functions488205
-Node: Built-in489078
-Node: Calling Built-in490156
-Node: Numeric Functions492144
-Ref: Numeric Functions-Footnote-1495978
-Ref: Numeric Functions-Footnote-2496335
-Ref: Numeric Functions-Footnote-3496383
-Node: String Functions496652
-Ref: String Functions-Footnote-1519663
-Ref: String Functions-Footnote-2519792
-Ref: String Functions-Footnote-3520040
-Node: Gory Details520127
-Ref: table-sub-escapes521796
-Ref: table-sub-posix-92523150
-Ref: table-sub-proposed524501
-Ref: table-posix-sub525855
-Ref: table-gensub-escapes527400
-Ref: Gory Details-Footnote-1528576
-Ref: Gory Details-Footnote-2528627
-Node: I/O Functions528778
-Ref: I/O Functions-Footnote-1535901
-Node: Time Functions536048
-Ref: Time Functions-Footnote-1546512
-Ref: Time Functions-Footnote-2546580
-Ref: Time Functions-Footnote-3546738
-Ref: Time Functions-Footnote-4546849
-Ref: Time Functions-Footnote-5546961
-Ref: Time Functions-Footnote-6547188
-Node: Bitwise Functions547454
-Ref: table-bitwise-ops548016
-Ref: Bitwise Functions-Footnote-1552261
-Node: Type Functions552445
-Node: I18N Functions553587
-Node: User-defined555232
-Node: Definition Syntax556036
-Ref: Definition Syntax-Footnote-1560961
-Node: Function Example561030
-Ref: Function Example-Footnote-1563674
-Node: Function Caveats563696
-Node: Calling A Function564214
-Node: Variable Scope565169
-Node: Pass By Value/Reference568157
-Node: Return Statement571665
-Node: Dynamic Typing574649
-Node: Indirect Calls575578
-Node: Functions Summary585291
-Node: Library Functions587830
-Ref: Library Functions-Footnote-1591448
-Ref: Library Functions-Footnote-2591591
-Node: Library Names591762
-Ref: Library Names-Footnote-1595235
-Ref: Library Names-Footnote-2595455
-Node: General Functions595541
-Node: Strtonum Function596569
-Node: Assert Function599349
-Node: Round Function602675
-Node: Cliff Random Function604216
-Node: Ordinal Functions605232
-Ref: Ordinal Functions-Footnote-1608309
-Ref: Ordinal Functions-Footnote-2608561
-Node: Join Function608772
-Ref: Join Function-Footnote-1610543
-Node: Getlocaltime Function610743
-Node: Readfile Function614479
-Node: Data File Management616318
-Node: Filetrans Function616950
-Node: Rewind Function621019
-Node: File Checking622406
-Ref: File Checking-Footnote-1623538
-Node: Empty Files623739
-Node: Ignoring Assigns625718
-Node: Getopt Function627272
-Ref: Getopt Function-Footnote-1638575
-Node: Passwd Functions638778
-Ref: Passwd Functions-Footnote-1647757
-Node: Group Functions647845
-Ref: Group Functions-Footnote-1655786
-Node: Walking Arrays655999
-Node: Library Functions Summary657602
-Node: Library exercises658990
-Node: Sample Programs660270
-Node: Running Examples661040
-Node: Clones661768
-Node: Cut Program662992
-Node: Egrep Program672860
-Ref: Egrep Program-Footnote-1680831
-Node: Id Program680941
-Node: Split Program684605
-Ref: Split Program-Footnote-1688143
-Node: Tee Program688271
-Node: Uniq Program691078
-Node: Wc Program698508
-Ref: Wc Program-Footnote-1702773
-Node: Miscellaneous Programs702865
-Node: Dupword Program704078
-Node: Alarm Program706109
-Node: Translate Program710923
-Ref: Translate Program-Footnote-1715314
-Ref: Translate Program-Footnote-2715584
-Node: Labels Program715718
-Ref: Labels Program-Footnote-1719089
-Node: Word Sorting719173
-Node: History Sorting723216
-Node: Extract Program725052
-Node: Simple Sed732588
-Node: Igawk Program735650
-Ref: Igawk Program-Footnote-1749961
-Ref: Igawk Program-Footnote-2750162
-Node: Anagram Program750300
-Node: Signature Program753368
-Node: Programs Summary754615
-Node: Programs Exercises755830
-Node: Advanced Features759481
-Node: Nondecimal Data761429
-Node: Array Sorting763006
-Node: Controlling Array Traversal763703
-Node: Array Sorting Functions771983
-Ref: Array Sorting Functions-Footnote-1775890
-Node: Two-way I/O776084
-Ref: Two-way I/O-Footnote-1781600
-Node: TCP/IP Networking781682
-Node: Profiling784526
-Node: Advanced Features Summary792068
-Node: Internationalization793932
-Node: I18N and L10N795412
-Node: Explaining gettext796098
-Ref: Explaining gettext-Footnote-1801238
-Ref: Explaining gettext-Footnote-2801422
-Node: Programmer i18n801587
-Node: Translator i18n805812
-Node: String Extraction806606
-Ref: String Extraction-Footnote-1807567
-Node: Printf Ordering807653
-Ref: Printf Ordering-Footnote-1810435
-Node: I18N Portability810499
-Ref: I18N Portability-Footnote-1812948
-Node: I18N Example813011
-Ref: I18N Example-Footnote-1815733
-Node: Gawk I18N815805
-Node: I18N Summary816443
-Node: Debugger817782
-Node: Debugging818804
-Node: Debugging Concepts819245
-Node: Debugging Terms821101
-Node: Awk Debugging823698
-Node: Sample Debugging Session824590
-Node: Debugger Invocation825110
-Node: Finding The Bug826443
-Node: List of Debugger Commands832925
-Node: Breakpoint Control834257
-Node: Debugger Execution Control837921
-Node: Viewing And Changing Data841281
-Node: Execution Stack844639
-Node: Debugger Info846152
-Node: Miscellaneous Debugger Commands850146
-Node: Readline Support855330
-Node: Limitations856222
-Node: Debugging Summary858496
-Node: Arbitrary Precision Arithmetic859660
-Node: Computer Arithmetic860989
-Ref: Computer Arithmetic-Footnote-1865376
-Node: Math Definitions865433
-Ref: table-ieee-formats868317
-Node: MPFR features868821
-Node: FP Math Caution870463
-Ref: FP Math Caution-Footnote-1871504
-Node: Inexactness of computations871873
-Node: Inexact representation872821
-Node: Comparing FP Values874176
-Node: Errors accumulate875140
-Node: Getting Accuracy876573
-Node: Try To Round879232
-Node: Setting precision880131
-Ref: table-predefined-precision-strings880813
-Node: Setting the rounding mode882606
-Ref: table-gawk-rounding-modes882970
-Ref: Setting the rounding mode-Footnote-1886424
-Node: Arbitrary Precision Integers886603
-Ref: Arbitrary Precision Integers-Footnote-1889573
-Node: POSIX Floating Point Problems889722
-Ref: POSIX Floating Point Problems-Footnote-1893591
-Node: Floating point summary893629
-Node: Dynamic Extensions895846
-Node: Extension Intro897398
-Node: Plugin License898663
-Node: Extension Mechanism Outline899348
-Ref: figure-load-extension899772
-Ref: figure-load-new-function901257
-Ref: figure-call-new-function902259
-Node: Extension API Description904243
-Node: Extension API Functions Introduction905693
-Node: General Data Types910558
-Ref: General Data Types-Footnote-1916251
-Node: Requesting Values916550
-Ref: table-value-types-returned917287
-Node: Memory Allocation Functions918245
-Ref: Memory Allocation Functions-Footnote-1920992
-Node: Constructor Functions921088
-Node: Registration Functions922846
-Node: Extension Functions923531
-Node: Exit Callback Functions925833
-Node: Extension Version String927082
-Node: Input Parsers927732
-Node: Output Wrappers937535
-Node: Two-way processors942051
-Node: Printing Messages944255
-Ref: Printing Messages-Footnote-1945332
-Node: Updating `ERRNO'945484
-Node: Accessing Parameters946223
-Node: Symbol Table Access947453
-Node: Symbol table by name947967
-Node: Symbol table by cookie949943
-Ref: Symbol table by cookie-Footnote-1954076
-Node: Cached values954139
-Ref: Cached values-Footnote-1957643
-Node: Array Manipulation957734
-Ref: Array Manipulation-Footnote-1958832
-Node: Array Data Types958871
-Ref: Array Data Types-Footnote-1961574
-Node: Array Functions961666
-Node: Flattening Arrays965540
-Node: Creating Arrays972392
-Node: Extension API Variables977123
-Node: Extension Versioning977759
-Node: Extension API Informational Variables979660
-Node: Extension API Boilerplate980746
-Node: Finding Extensions984550
-Node: Extension Example985110
-Node: Internal File Description985840
-Node: Internal File Ops989931
-Ref: Internal File Ops-Footnote-11001363
-Node: Using Internal File Ops1001503
-Ref: Using Internal File Ops-Footnote-11003850
-Node: Extension Samples1004118
-Node: Extension Sample File Functions1005642
-Node: Extension Sample Fnmatch1013210
-Node: Extension Sample Fork1014691
-Node: Extension Sample Inplace1015904
-Node: Extension Sample Ord1017579
-Node: Extension Sample Readdir1018415
-Ref: table-readdir-file-types1019271
-Node: Extension Sample Revout1020070
-Node: Extension Sample Rev2way1020661
-Node: Extension Sample Read write array1021402
-Node: Extension Sample Readfile1023281
-Node: Extension Sample API Tests1024381
-Node: Extension Sample Time1024906
-Node: gawkextlib1026221
-Node: Extension summary1029034
-Node: Extension Exercises1032727
-Node: Language History1033449
-Node: V7/SVR3.11035092
-Node: SVR41037412
-Node: POSIX1038854
-Node: BTL1040240
-Node: POSIX/GNU1040974
-Node: Feature History1046573
-Node: Common Extensions1059703
-Node: Ranges and Locales1061015
-Ref: Ranges and Locales-Footnote-11065632
-Ref: Ranges and Locales-Footnote-21065659
-Ref: Ranges and Locales-Footnote-31065893
-Node: Contributors1066114
-Node: History summary1071576
-Node: Installation1072945
-Node: Gawk Distribution1073896
-Node: Getting1074380
-Node: Extracting1075206
-Node: Distribution contents1076848
-Node: Unix Installation1082565
-Node: Quick Installation1083182
-Node: Additional Configuration Options1085624
-Node: Configuration Philosophy1087362
-Node: Non-Unix Installation1089713
-Node: PC Installation1090171
-Node: PC Binary Installation1091482
-Node: PC Compiling1093330
-Ref: PC Compiling-Footnote-11096329
-Node: PC Testing1096434
-Node: PC Using1097610
-Node: Cygwin1101768
-Node: MSYS1102577
-Node: VMS Installation1103091
-Node: VMS Compilation1103887
-Ref: VMS Compilation-Footnote-11105109
-Node: VMS Dynamic Extensions1105167
-Node: VMS Installation Details1106540
-Node: VMS Running1108792
-Node: VMS GNV1111626
-Node: VMS Old Gawk1112349
-Node: Bugs1112819
-Node: Other Versions1116823
-Node: Installation summary1123077
-Node: Notes1124133
-Node: Compatibility Mode1124998
-Node: Additions1125780
-Node: Accessing The Source1126705
-Node: Adding Code1128141
-Node: New Ports1134319
-Node: Derived Files1138800
-Ref: Derived Files-Footnote-11143881
-Ref: Derived Files-Footnote-21143915
-Ref: Derived Files-Footnote-31144511
-Node: Future Extensions1144625
-Node: Implementation Limitations1145231
-Node: Extension Design1146479
-Node: Old Extension Problems1147633
-Ref: Old Extension Problems-Footnote-11149150
-Node: Extension New Mechanism Goals1149207
-Ref: Extension New Mechanism Goals-Footnote-11152567
-Node: Extension Other Design Decisions1152756
-Node: Extension Future Growth1154862
-Node: Old Extension Mechanism1155698
-Node: Notes summary1157460
-Node: Basic Concepts1158646
-Node: Basic High Level1159327
-Ref: figure-general-flow1159599
-Ref: figure-process-flow1160198
-Ref: Basic High Level-Footnote-11163427
-Node: Basic Data Typing1163612
-Node: Glossary1166940
-Node: Copying1192092
-Node: GNU Free Documentation License1229648
-Node: Index1254784
+Ref: Auto-set-Footnote-1444369
+Ref: Auto-set-Footnote-2444574
+Node: ARGC and ARGV444630
+Node: Pattern Action Summary448484
+Node: Arrays450707
+Node: Array Basics452256
+Node: Array Intro453082
+Ref: figure-array-elements455055
+Node: Reference to Elements457462
+Node: Assigning Elements459735
+Node: Array Example460226
+Node: Scanning an Array461958
+Node: Controlling Scanning464973
+Ref: Controlling Scanning-Footnote-1470146
+Node: Delete470462
+Ref: Delete-Footnote-1473227
+Node: Numeric Array Subscripts473284
+Node: Uninitialized Subscripts475467
+Node: Multidimensional477092
+Node: Multiscanning480185
+Node: Arrays of Arrays481774
+Node: Arrays Summary486437
+Node: Functions488542
+Node: Built-in489415
+Node: Calling Built-in490493
+Node: Numeric Functions492481
+Ref: Numeric Functions-Footnote-1496315
+Ref: Numeric Functions-Footnote-2496672
+Ref: Numeric Functions-Footnote-3496720
+Node: String Functions496989
+Ref: String Functions-Footnote-1520000
+Ref: String Functions-Footnote-2520129
+Ref: String Functions-Footnote-3520377
+Node: Gory Details520464
+Ref: table-sub-escapes522133
+Ref: table-sub-posix-92523487
+Ref: table-sub-proposed524838
+Ref: table-posix-sub526192
+Ref: table-gensub-escapes527737
+Ref: Gory Details-Footnote-1528913
+Ref: Gory Details-Footnote-2528964
+Node: I/O Functions529115
+Ref: I/O Functions-Footnote-1536238
+Node: Time Functions536385
+Ref: Time Functions-Footnote-1546849
+Ref: Time Functions-Footnote-2546917
+Ref: Time Functions-Footnote-3547075
+Ref: Time Functions-Footnote-4547186
+Ref: Time Functions-Footnote-5547298
+Ref: Time Functions-Footnote-6547525
+Node: Bitwise Functions547791
+Ref: table-bitwise-ops548353
+Ref: Bitwise Functions-Footnote-1552598
+Node: Type Functions552782
+Node: I18N Functions553924
+Node: User-defined555569
+Node: Definition Syntax556373
+Ref: Definition Syntax-Footnote-1561298
+Node: Function Example561367
+Ref: Function Example-Footnote-1564011
+Node: Function Caveats564033
+Node: Calling A Function564551
+Node: Variable Scope565506
+Node: Pass By Value/Reference568494
+Node: Return Statement572002
+Node: Dynamic Typing574986
+Node: Indirect Calls575915
+Node: Functions Summary585628
+Node: Library Functions588167
+Ref: Library Functions-Footnote-1591785
+Ref: Library Functions-Footnote-2591928
+Node: Library Names592099
+Ref: Library Names-Footnote-1595572
+Ref: Library Names-Footnote-2595792
+Node: General Functions595878
+Node: Strtonum Function596906
+Node: Assert Function599686
+Node: Round Function603012
+Node: Cliff Random Function604553
+Node: Ordinal Functions605569
+Ref: Ordinal Functions-Footnote-1608646
+Ref: Ordinal Functions-Footnote-2608898
+Node: Join Function609109
+Ref: Join Function-Footnote-1610880
+Node: Getlocaltime Function611080
+Node: Readfile Function614816
+Node: Data File Management616655
+Node: Filetrans Function617287
+Node: Rewind Function621356
+Node: File Checking622743
+Ref: File Checking-Footnote-1623875
+Node: Empty Files624076
+Node: Ignoring Assigns626055
+Node: Getopt Function627609
+Ref: Getopt Function-Footnote-1638912
+Node: Passwd Functions639115
+Ref: Passwd Functions-Footnote-1648094
+Node: Group Functions648182
+Ref: Group Functions-Footnote-1656123
+Node: Walking Arrays656336
+Node: Library Functions Summary657939
+Node: Library exercises659327
+Node: Sample Programs660607
+Node: Running Examples661377
+Node: Clones662105
+Node: Cut Program663329
+Node: Egrep Program673197
+Ref: Egrep Program-Footnote-1681168
+Node: Id Program681278
+Node: Split Program684942
+Ref: Split Program-Footnote-1688480
+Node: Tee Program688608
+Node: Uniq Program691415
+Node: Wc Program698845
+Ref: Wc Program-Footnote-1703110
+Node: Miscellaneous Programs703202
+Node: Dupword Program704415
+Node: Alarm Program706446
+Node: Translate Program711260
+Ref: Translate Program-Footnote-1715651
+Ref: Translate Program-Footnote-2715921
+Node: Labels Program716055
+Ref: Labels Program-Footnote-1719426
+Node: Word Sorting719510
+Node: History Sorting723553
+Node: Extract Program725389
+Node: Simple Sed732925
+Node: Igawk Program735987
+Ref: Igawk Program-Footnote-1750298
+Ref: Igawk Program-Footnote-2750499
+Node: Anagram Program750637
+Node: Signature Program753705
+Node: Programs Summary754952
+Node: Programs Exercises756167
+Node: Advanced Features759818
+Node: Nondecimal Data761766
+Node: Array Sorting763343
+Node: Controlling Array Traversal764040
+Node: Array Sorting Functions772320
+Ref: Array Sorting Functions-Footnote-1776227
+Node: Two-way I/O776421
+Ref: Two-way I/O-Footnote-1781937
+Node: TCP/IP Networking782019
+Node: Profiling784863
+Node: Advanced Features Summary792405
+Node: Internationalization794269
+Node: I18N and L10N795749
+Node: Explaining gettext796435
+Ref: Explaining gettext-Footnote-1801575
+Ref: Explaining gettext-Footnote-2801759
+Node: Programmer i18n801924
+Node: Translator i18n806149
+Node: String Extraction806943
+Ref: String Extraction-Footnote-1807904
+Node: Printf Ordering807990
+Ref: Printf Ordering-Footnote-1810772
+Node: I18N Portability810836
+Ref: I18N Portability-Footnote-1813285
+Node: I18N Example813348
+Ref: I18N Example-Footnote-1816070
+Node: Gawk I18N816142
+Node: I18N Summary816780
+Node: Debugger818119
+Node: Debugging819141
+Node: Debugging Concepts819582
+Node: Debugging Terms821438
+Node: Awk Debugging824035
+Node: Sample Debugging Session824927
+Node: Debugger Invocation825447
+Node: Finding The Bug826780
+Node: List of Debugger Commands833262
+Node: Breakpoint Control834594
+Node: Debugger Execution Control838258
+Node: Viewing And Changing Data841618
+Node: Execution Stack844976
+Node: Debugger Info846489
+Node: Miscellaneous Debugger Commands850483
+Node: Readline Support855667
+Node: Limitations856559
+Node: Debugging Summary858833
+Node: Arbitrary Precision Arithmetic859997
+Node: Computer Arithmetic861326
+Ref: Computer Arithmetic-Footnote-1865713
+Node: Math Definitions865770
+Ref: table-ieee-formats868654
+Node: MPFR features869158
+Node: FP Math Caution870800
+Ref: FP Math Caution-Footnote-1871841
+Node: Inexactness of computations872210
+Node: Inexact representation873158
+Node: Comparing FP Values874513
+Node: Errors accumulate875477
+Node: Getting Accuracy876910
+Node: Try To Round879569
+Node: Setting precision880468
+Ref: table-predefined-precision-strings881150
+Node: Setting the rounding mode882943
+Ref: table-gawk-rounding-modes883307
+Ref: Setting the rounding mode-Footnote-1886761
+Node: Arbitrary Precision Integers886940
+Ref: Arbitrary Precision Integers-Footnote-1889910
+Node: POSIX Floating Point Problems890059
+Ref: POSIX Floating Point Problems-Footnote-1893928
+Node: Floating point summary893966
+Node: Dynamic Extensions896183
+Node: Extension Intro897735
+Node: Plugin License899000
+Node: Extension Mechanism Outline899685
+Ref: figure-load-extension900109
+Ref: figure-load-new-function901594
+Ref: figure-call-new-function902596
+Node: Extension API Description904580
+Node: Extension API Functions Introduction906030
+Node: General Data Types910895
+Ref: General Data Types-Footnote-1916588
+Node: Requesting Values916887
+Ref: table-value-types-returned917624
+Node: Memory Allocation Functions918582
+Ref: Memory Allocation Functions-Footnote-1921329
+Node: Constructor Functions921425
+Node: Registration Functions923183
+Node: Extension Functions923868
+Node: Exit Callback Functions926170
+Node: Extension Version String927419
+Node: Input Parsers928069
+Node: Output Wrappers937872
+Node: Two-way processors942388
+Node: Printing Messages944592
+Ref: Printing Messages-Footnote-1945669
+Node: Updating `ERRNO'945821
+Node: Accessing Parameters946560
+Node: Symbol Table Access947790
+Node: Symbol table by name948304
+Node: Symbol table by cookie950280
+Ref: Symbol table by cookie-Footnote-1954413
+Node: Cached values954476
+Ref: Cached values-Footnote-1957980
+Node: Array Manipulation958071
+Ref: Array Manipulation-Footnote-1959169
+Node: Array Data Types959208
+Ref: Array Data Types-Footnote-1961911
+Node: Array Functions962003
+Node: Flattening Arrays965877
+Node: Creating Arrays972729
+Node: Extension API Variables977460
+Node: Extension Versioning978096
+Node: Extension API Informational Variables979997
+Node: Extension API Boilerplate981083
+Node: Finding Extensions984887
+Node: Extension Example985447
+Node: Internal File Description986177
+Node: Internal File Ops990268
+Ref: Internal File Ops-Footnote-11001700
+Node: Using Internal File Ops1001840
+Ref: Using Internal File Ops-Footnote-11004187
+Node: Extension Samples1004455
+Node: Extension Sample File Functions1005979
+Node: Extension Sample Fnmatch1013547
+Node: Extension Sample Fork1015028
+Node: Extension Sample Inplace1016241
+Node: Extension Sample Ord1017916
+Node: Extension Sample Readdir1018752
+Ref: table-readdir-file-types1019608
+Node: Extension Sample Revout1020407
+Node: Extension Sample Rev2way1020998
+Node: Extension Sample Read write array1021739
+Node: Extension Sample Readfile1023618
+Node: Extension Sample API Tests1024718
+Node: Extension Sample Time1025243
+Node: gawkextlib1026558
+Node: Extension summary1029371
+Node: Extension Exercises1033064
+Node: Language History1033786
+Node: V7/SVR3.11035429
+Node: SVR41037749
+Node: POSIX1039191
+Node: BTL1040577
+Node: POSIX/GNU1041311
+Node: Feature History1046910
+Node: Common Extensions1060040
+Node: Ranges and Locales1061352
+Ref: Ranges and Locales-Footnote-11065969
+Ref: Ranges and Locales-Footnote-21065996
+Ref: Ranges and Locales-Footnote-31066230
+Node: Contributors1066451
+Node: History summary1071913
+Node: Installation1073282
+Node: Gawk Distribution1074233
+Node: Getting1074717
+Node: Extracting1075543
+Node: Distribution contents1077185
+Node: Unix Installation1082902
+Node: Quick Installation1083519
+Node: Additional Configuration Options1085961
+Node: Configuration Philosophy1087699
+Node: Non-Unix Installation1090050
+Node: PC Installation1090508
+Node: PC Binary Installation1091819
+Node: PC Compiling1093667
+Ref: PC Compiling-Footnote-11096666
+Node: PC Testing1096771
+Node: PC Using1097947
+Node: Cygwin1102105
+Node: MSYS1102914
+Node: VMS Installation1103428
+Node: VMS Compilation1104224
+Ref: VMS Compilation-Footnote-11105446
+Node: VMS Dynamic Extensions1105504
+Node: VMS Installation Details1106877
+Node: VMS Running1109129
+Node: VMS GNV1111963
+Node: VMS Old Gawk1112686
+Node: Bugs1113156
+Node: Other Versions1117160
+Node: Installation summary1123414
+Node: Notes1124470
+Node: Compatibility Mode1125335
+Node: Additions1126117
+Node: Accessing The Source1127042
+Node: Adding Code1128478
+Node: New Ports1134656
+Node: Derived Files1139137
+Ref: Derived Files-Footnote-11144218
+Ref: Derived Files-Footnote-21144252
+Ref: Derived Files-Footnote-31144848
+Node: Future Extensions1144962
+Node: Implementation Limitations1145568
+Node: Extension Design1146816
+Node: Old Extension Problems1147970
+Ref: Old Extension Problems-Footnote-11149487
+Node: Extension New Mechanism Goals1149544
+Ref: Extension New Mechanism Goals-Footnote-11152904
+Node: Extension Other Design Decisions1153093
+Node: Extension Future Growth1155199
+Node: Old Extension Mechanism1156035
+Node: Notes summary1157797
+Node: Basic Concepts1158983
+Node: Basic High Level1159664
+Ref: figure-general-flow1159936
+Ref: figure-process-flow1160535
+Ref: Basic High Level-Footnote-11163764
+Node: Basic Data Typing1163949
+Node: Glossary1167277
+Node: Copying1192429
+Node: GNU Free Documentation License1229985
+Node: Index1255121

End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index 8705b9e0..70fdacb4 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -14447,10 +14447,18 @@ next file is opened.
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,
-@code{ENVIRON["HOME"]} might be @code{"/home/arnold"}. Changing this array
-does not affect the environment passed on to any programs that
-@command{awk} may spawn via redirection or the @code{system()} function.
-(In a future version of @command{gawk}, it may do so.)
+@code{ENVIRON["HOME"]} might be @code{/home/arnold}.
+
+For POSIX @command{awk}, changing this array does not affect the
+environment passed on to any programs that @command{awk} may spawn via
+redirection or the @code{system()} function.
+
+However, beginning with version 4.2, if not in POSIX
+compatibility mode, @command{gawk} does update its own environment when
+@code{ENVIRON} is changed, thus changing the environment seen by programs
+that it creates. You should therefore be especially careful if you
+modify @code{ENVIRON["PATH"]"}, which is the search path for finding
+executable programs.
Some operating systems may not have environment variables.
On such systems, the @code{ENVIRON} array is empty (except for
@@ -37622,9 +37630,10 @@ mail at the Internet address noted previously.
If you find bugs in one of the non-Unix ports of @command{gawk}, please send
an electronic mail message to the person who maintains that port. They
-are named in the following list, as well as in the @file{README} file in the @command{gawk}
-distribution. Information in the @file{README} file should be considered
-authoritative if it conflicts with this @value{DOCUMENT}.
+are named in the following list, as well as in the @file{README} file
+in the @command{gawk} distribution. Information in the @file{README}
+file should be considered authoritative if it conflicts with this
+@value{DOCUMENT}.
The people maintaining the non-Unix ports of @command{gawk} are
as follows:
@@ -37652,7 +37661,8 @@ John Malmberg, @EMAIL{wb8tyw@@qsl.net,wb8tyw at qsl.net}.
@end multitable
If your bug is also reproducible under Unix, please send a copy of your
-report to the @EMAIL{bug-gawk@@gnu.org,bug-gawk at gnu dot org} email list as well.
+report to the @EMAIL{bug-gawk@@gnu.org,bug-gawk at gnu dot org} email
+list as well.
@c ENDOFRANGE dbugg
@c ENDOFRANGE tblgawb
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index 8678988a..0ecd573d 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -13827,10 +13827,18 @@ next file is opened.
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,
-@code{ENVIRON["HOME"]} might be @code{"/home/arnold"}. Changing this array
-does not affect the environment passed on to any programs that
-@command{awk} may spawn via redirection or the @code{system()} function.
-(In a future version of @command{gawk}, it may do so.)
+@code{ENVIRON["HOME"]} might be @code{/home/arnold}.
+
+For POSIX @command{awk}, changing this array does not affect the
+environment passed on to any programs that @command{awk} may spawn via
+redirection or the @code{system()} function.
+
+However, beginning with version 4.2, if not in POSIX
+compatibility mode, @command{gawk} does update its own environment when
+@code{ENVIRON} is changed, thus changing the environment seen by programs
+that it creates. You should therefore be especially careful if you
+modify @code{ENVIRON["PATH"]"}, which is the search path for finding
+executable programs.
Some operating systems may not have environment variables.
On such systems, the @code{ENVIRON} array is empty (except for
@@ -36766,9 +36774,10 @@ mail at the Internet address noted previously.
If you find bugs in one of the non-Unix ports of @command{gawk}, please send
an electronic mail message to the person who maintains that port. They
-are named in the following list, as well as in the @file{README} file in the @command{gawk}
-distribution. Information in the @file{README} file should be considered
-authoritative if it conflicts with this @value{DOCUMENT}.
+are named in the following list, as well as in the @file{README} file
+in the @command{gawk} distribution. Information in the @file{README}
+file should be considered authoritative if it conflicts with this
+@value{DOCUMENT}.
The people maintaining the non-Unix ports of @command{gawk} are
as follows:
@@ -36796,7 +36805,8 @@ John Malmberg, @EMAIL{wb8tyw@@qsl.net,wb8tyw at qsl.net}.
@end multitable
If your bug is also reproducible under Unix, please send a copy of your
-report to the @EMAIL{bug-gawk@@gnu.org,bug-gawk at gnu dot org} email list as well.
+report to the @EMAIL{bug-gawk@@gnu.org,bug-gawk at gnu dot org} email
+list as well.
@c ENDOFRANGE dbugg
@c ENDOFRANGE tblgawb