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   Usage: gawk [POSIX or GNU style options] -f progfile [--] file ...
Usage: gawk [POSIX or GNU style options] [--] 'program' file ...
POSIX options:		GNU long options:
	-f progfile		--file=progfile
	-F fs			--field-separator=fs
	-v var=val		--assign=var=val
	-m[fr] val
	-O			--optimize
	-W compat		--compat
	-W copyleft		--copyleft
	-W copyright		--copyright
	-W dump-variables[=file]	--dump-variables[=file]
	-W exec=file		--exec=file
	-W gen-po		--gen-po
	-W help			--help
	-W lint[=fatal]		--lint[=fatal]
	-W lint-old		--lint-old
	-W non-decimal-data	--non-decimal-data
	-W profile[=file]	--profile[=file]
	-W posix		--posix
	-W re-interval		--re-interval
	-W source=program-text	--source=program-text
	-W traditional		--traditional
	-W usage		--usage
	-W use-lc-numeric	--use-lc-numeric
	-W version		--version

To report bugs, see node `Bugs' in `', 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