Last active
April 8, 2022 20:20
-
-
Save gregmark/f7c652ffa0313480d69ae79d47ac1b40 to your computer and use it in GitHub Desktop.
BASH while opts
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/bin/bash | |
# https://medium.com/@Drew_Stokes/bash-argument-parsing-54f3b81a6a8f | |
PARAMS="" | |
while (( "$#" )); do | |
case "$1" in | |
-a|--my-boolean-flag) | |
MY_FLAG=0 | |
shift | |
;; | |
-b|--my-flag-with-argument) | |
if [ -n "$2" ] && [ ${2:0:1} != "-" ]; then | |
MY_FLAG_ARG=$2 | |
shift 2 | |
else | |
echo "Error: Argument for $1 is missing" >&2 | |
exit 1 | |
fi | |
;; | |
-*|--*=) # unsupported flags | |
echo "Error: Unsupported flag $1" >&2 | |
exit 1 | |
;; | |
*) # preserve positional arguments | |
PARAMS="$PARAMS $1" | |
shift | |
;; | |
esac | |
done | |
# set positional arguments in their proper place | |
eval set -- "$PARAMS" |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment