bash snippet to parse arguments

options

#!/usr/bin/env bash

NAME=${NAME:-unknown}

main() {
  while [ "$#" != 0 ]; do
    case "$1" in
      -h|--help) usage ;;
      -n|--name) shift; set_name "$1" ;;
      *) work $1; exit ;;
    esac
    shift
  done
}

set_name() {
  NAME="$1"
}

usage() {
  echo
  echo '  Usage:'
  echo '    options [options] <command>'
  echo
  echo '  Options:'
  echo '    -h --help  print usage information'
  echo '    -n --name  your username'
  echo
}

work() {
  echo "NAME: "'"'"${NAME}"'"'
  echo $1
}

[ "$#" = 0 ] && usage || main "$@"