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Diffstat (limited to 'doc/gawk.texi')
| -rw-r--r-- | doc/gawk.texi | 54 |
1 files changed, 31 insertions, 23 deletions
diff --git a/doc/gawk.texi b/doc/gawk.texi index 75bf11f0..cf7c4ed5 100644 --- a/doc/gawk.texi +++ b/doc/gawk.texi @@ -21,9 +21,9 @@ @c applies to, and when the document was updated. @set TITLE The GNU Awk User's Guide @set SUBTITLE Effective AWK Programming -@set EDITION 1.0.1 +@set PATCHLEVEL 2 +@set EDITION 1.0.@value{PATCHLEVEL} @set VERSION 3.0 -@set PATCHLEVEL 1 @set UPDATE-MONTH December 1996 @iftex @set DOCUMENT book @@ -2718,11 +2718,15 @@ program as it runs. Case is significant by default because @code{IGNORECASE} (like most variables) is initialized to zero. @example +@group x = "aB" if (x ~ /ab/) @dots{} # this test will fail +@end group +@group IGNORECASE = 1 if (x ~ /ab/) @dots{} # now it will succeed +@end group @end example In general, you cannot use @code{IGNORECASE} to make certain rules @@ -3617,23 +3621,18 @@ of a record separately. In @code{gawk}, this is easy to do, you simply assign the null string (@code{""}) to @code{FS}. In this case, each individual character in the record will become a separate field. Here is an example: -@c extra verbiage due to page boundaries - -@example -echo a b | gawk 'BEGIN @{ FS = "" @} - @{ - for (i = 1; i <= NF; i = i + 1) - print "Field", i, "is", $i - @}' -@end example - -@noindent -The output from this is: @example -Field 1 is a -Field 2 is -Field 3 is b +@group +$ echo a b | gawk 'BEGIN @{ FS = "" @} +> @{ +> for (i = 1; i <= NF; i = i + 1) +> print "Field", i, "is", $i +> @}' +@print{} Field 1 is a +@print{} Field 2 is +@print{} Field 3 is b +@end group @end example @cindex dark corner @@ -10312,7 +10311,7 @@ $ awk '@{ print $1 + $2 @}' | cat @end example @noindent -Here, no output is printed until after the @kbd{Control-D} is typed, since +Here, no output is printed until after the @kbd{Control-d} is typed, since it is all buffered, and sent down the pipe to @code{cat} in one shot. @c fakenode --- for prepinfo @@ -14548,8 +14547,10 @@ BEGIN \ split(pw, a, ":") printf("(%s)", a[1]) @} +@group if (i < NF) printf(",") +@end group @} @} print "" @@ -14599,8 +14600,7 @@ is used as the prefix for the output file names. # usage: split [-num] [file] [outname] -BEGIN \ -@{ +BEGIN @{ outfile = "x" # default count = 1000 if (ARGC > 4) @@ -14720,33 +14720,41 @@ Finally, @code{awk} is forced to read the standard input by setting @findex tee.awk @example -@c @group +@group @c file eg/prog/tee.awk # tee.awk --- tee in awk # Arnold Robbins, arnold@@gnu.ai.mit.edu, Public Domain # May 1993 # Revised December 1995 +@end group +@group BEGIN \ @{ for (i = 1; i < ARGC; i++) copy[i] = ARGV[i] +@end group +@group if (ARGV[1] == "-a") @{ append = 1 delete ARGV[1] delete copy[1] ARGC-- @} +@end group +@group if (ARGC < 2) @{ print "usage: tee [-a] file ..." > "/dev/stderr" exit 1 @} +@end group +@group ARGV[1] = "-" ARGC = 2 @} @c endfile -@c @end group +@end group @end example The single rule does all the work. Since there is no pattern, it is @@ -18398,7 +18406,7 @@ You can copy it from someone else who already has it. @item You can order @code{gawk} directly from the Free Software Foundation. Software distributions are available for Unix, MS-DOS, and VMS, on -tape, CD-ROM, or floppies (MS-DOS only). The address is: +tape and CD-ROM. The address is: @quotation Free Software Foundation @* |