#!/bin/bash

while [[ $# -gt 0 ]]; do
  case "$1" in
    -a|--all)
      # set option a/all
      shift                 # and get the next argument
      ;;
    -h|--help)
      # display help
      exit                  # because we want to stop
      ;;
    -z|--zooper)
      zooper=$2             # grab the NEXT argument after the -z|--zooper
      shift                 # throw away the -z|--zooper
      shift                 # and throw away its value that we've also used
      ;;
    -*|--*)
      echo "We've found an unknown option: $1"
      # show help if you like
      shift
      break                 # stop parsing but allow script to continue, if that's useful
      ;;
    *)
      echo "I don't know how we got here, it shouldn't happen. Should have handled the args or hit the unknowns option just above."
      exit
      ;;
  esac
done