#!/bin/bash

# Example of doing things with optional args in shell scripts using optargs

# yes, shell scripts have functions
usage() {
    echo "usage optargs1.sg [-s] [-r] [-f filename] [-d dropname] [-h]"
    exit 2
}

if [[ $# -eq 0 ]]
then
    usage   # note that function call to a no arg fun does not have params
fi

while getopts 'hsrd:f:' c  #param that have required additional arg get a :
do
  case $c in   # case is equivalent to C switch
    s) echo "Save" 
        ;;
    r) echo "Restore" 
        ;;
    d) echo "Drop $OPTARG" 
        ;;
    f) echo "File $OPTARG"
        ;;
    h) usage
       ;;
  esac   # end the case
done
shift $((OPTIND - 1))  # throw away all of the used command line params
echo "REST: $*"