Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Parse bash command options with getopt(1)
#!/usr/bin/env bash
# “a” and “arga” have optional arguments with default values.
# “b” and “argb” have no arguments, acting as sort of a flag.
# “c” and “argc” have required arguments.
# getopt bin
getopt=/usr/local/opt/gnu-getopt/bin/getopt
# set an initial value for the flag
ARG_B=0
# read the options
TEMP=$($getopt -o a::bc: --long arga::,argb,argc: -n 'test.sh' -- "$@")
eval set -- "$TEMP"
# extract options and their arguments into variables.
while true ; do
case "$1" in
-a|--arga)
case "$2" in
"") ARG_A='some default value' ; shift 2 ;;
*) ARG_A=$2 ; shift 2 ;;
esac ;;
-b|--argb) ARG_B=1 ; shift ;;
-c|--argc)
case "$2" in
"") shift 2 ;;
*) ARG_C=$2 ; shift 2 ;;
esac ;;
--) shift ; break ;;
*) echo "Internal error!" ; exit 1 ;;
esac
done
# do something with the variables -- in this case the lamest possible one :-)
echo "ARG_A = $ARG_A"
echo "ARG_B = $ARG_B"
echo "ARG_C = $ARG_C"
#!/usr/bin/env bash
# getopt bin
getopt=/usr/local/opt/gnu-getopt/bin/getopt
args=$($getopt --options=d --long=delete -- "$@")
eval set -- "$args"
delete=false
while true ; do
case "$1" in
-d|--delete)
delete=true
shift
;;
--)
shift
break
;;
*)
echo "Error"
exit 1
;;
esac
done
if $delete
then
echo 'Delete is ON'
else
echo 'Delete is OFF'
fi
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment