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Bash argument parser supporting long options and positional arguments alike
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#!/bin/bash | |
# @source: 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" |
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