bash, arguments

arguments.sh

#!/bin/bash

if [[ "$1" = "" ]]; then
    echo "Usage:"
    echo "  -a   foo|bar      Select foo or bar"
    echo "  -v                verbose (set -x)"
    echo "  --arg1            One arg"
    echo ""
    echo "Example: 
    echo "  ./arguments.sh -a foo --arg1"

    exit 0
fi

POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"


case $key in
    -a|--alphabet)
    export selected_a="$2"
    shift # past argument
    shift # past value
    ;;
    --arg1
    export hello=y
    shift # past argument
    ;;
    -v|--verbose)
    export verbose=y
    shift # past argument
    ;;
    *)    # unknown option
    POSITIONAL+=("$1") # save it in an array for later
    shift # past argument
    ;;
esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters