gawk: option requires an argument -- f

Usage: gawk [POSIX or GNU style options] -f progfile [--] file ...

Usage: gawk [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			--no-optimize

	-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.  This same information may be found at

https://www.gnu.org/software/gawk/manual/html_node/Bugs.html.

PLEASE do NOT try to report bugs by posting in comp.lang.awk.

gawk is a pattern scanning and processing language.

By default it reads standard input and writes standard output.

Examples:

	gawk '{ sum += $1 }; END { print sum }' file

	gawk -F: '{ print $1 }' /etc/passwd