Template for shell-script with option-parsing

bash template with option parsing

#!/bin/bash

usage() {
    echo >&2 "Usage: $0 [ -d directory | --dir directory ] [ -u user | --user user ] | --help"
}

invalid() {
    echo >&2 "Invalid option $1.  Try $0 --help to see available options."
}

while :
do
  case $# in 0) break ;; esac
  case $1 in
    -d|--dir) shift; dir=$1; shift ;;
    -u|--user) shift; user=$1; shift ;;
    -a|--all) shift; all=true ;;
    -|--) shift; break;;
    -h|--help) usage ; exit 1;;
    -*) invalid "$1"; exit 2 ;;
    *) break ;;
  esac
done

echo $user
echo $dir
echo "$@"

echo "$all"

exit