argparse.sh

rest=()
while [[ $# -ge 1 ]]; do
    arg="$1"
    shift

    case "$arg" in
        -f|--foo)
            foo=true
            ;;
        -p|--param-that-takes-an-arg)
            params_arg="$1"
            shift  # extra shift so we don't re-parse the param's arg 
            ;;
        *)
            # optionally keep unknown options around to be handled later
            rest=("${rest[@]}" "$arg")
            ;;
    esac
done
set -- "${rest[@]}" "$1"  # let anything we didn't parse out above be

echo "foo: $foo"
echo "arg for -p: $params_arg"

echo "Unparsed args: $@"