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awk --version (return code: 0)

GNU Awk 4.1.3, API: 1.1 (GNU MPFR 3.1.4, GNU MP 6.1.0)
Copyright (C) 1989, 1991-2015 Free Software Foundation.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
awk --help (return code: 0)

Usage: awk [POSIX or GNU style options] -f progfile [--] file ...
Usage: awk [POSIX or GNU style options] [--] 'program' file ...
POSIX options:  GNU long options: (standard)
 -f progfile  --file=progfile
 -F fs   --field-separator=fs
 -v var=val  --assign=var=val
Short options:  GNU long options: (extensions)
 -b   --characters-as-bytes
 -c   --traditional
 -C   --copyright
 -d[file]  --dump-variables[=file]
 -D[file]  --debug[=file]
 -e 'program-text' --source='program-text'
 -E file   --exec=file
 -g   --gen-pot
 -h   --help
 -i includefile  --include=includefile
 -l library  --load=library
 -L[fatal|invalid] --lint[=fatal|invalid]
 -M   --bignum
 -N   --use-lc-numeric
 -n   --non-decimal-data
 -o[file]  --pretty-print[=file]
 -O   --optimize
 -p[file]  --profile[=file]
 -P   --posix
 -r   --re-interval
 -S   --sandbox
 -t   --lint-old
 -V   --version

To report bugs, see node `Bugs' in `gawk.info', which is
section `Reporting Problems and Bugs' in the printed version.

gawk is a pattern scanning and processing language.
By default it reads standard input and writes standard output.

 gawk '{ sum += $1 }; END { print sum }' file
 gawk -F: '{ print $1 }' /etc/passwd


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