#!/bin/bash

die() {
        echo "$@" >&2
        exit 1
}

## Read input arguments
while [ $# -ge 1 ]; do 
    case "$1" in 
        -v | --verbose ) verbose=true;; 
        -z | --gzip )
                [ -z "$compression" ] || die "Conflicting option $1"
                compression="gz";; 
        -b | --bzip2 )
                [ -z "$compression" ] || die "Conflicting option $1"
                compression="bz";; 
        -n | --no-compress)
                [ -z "$compression" ] || die "Conflicting option $1"
                compression="none";;
        -h | --help ) showUsage; exit 0 ;; 
        *) die "Invalid option $1. Use -h or --help to show usage" ;; 
    esac
    shift
done