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Top Forums UNIX for Beginners Questions & Answers awk Associative Array and/or Referring to Field by String (Nonconstant String Value) Post 303029885 by Scrutinizer on Saturday 2nd of February 2019 08:14:21 AM
Old 02-02-2019
Note that the behavior with the default FS=" " to skip and delimit using both blanks and newlines, used to be different in older Posix implementations, where blanks were used, but not newlines. mawk and gawk still support this older POSIX defined behavior, with special compatibility command line options.

compare:
Code:
$> echo "1.   222   333.
444.   555.666" | mawk '{print $1}' RS=.
1
222
444
555
666
$>

to
Code:
$> echo "1.   222   333.
444.   555.666" | mawk -W posix_space '{print $1}' RS=.
1
222

444
555
666

$>

Likewise for gawk with the --posix option.

Last edited by Scrutinizer; 02-02-2019 at 10:13 AM..
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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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