*** script 1

#!/bin/bash
usage="Usage: $0 [-gm <maximum number of nodes used>] "
GENERATE_ORDERS=0
unset OPTIND; while getopts "gm:" options; do
  case $options in
    g )  GENERATE_ORDERS=1;;
    m )  maxnodesarg=$OPTARG;;
    * )  echo $usage
         exit 1;;
  esac
done

*** script 2 - source'd by script 1

#!/bin/bash
usage="Usage: $0 [-gd]"
DEBUGGING=0
GENERATE_ORDERS=0
unset OPTIND; while getopts "gd" options; do
  case $options in
    g ) GENERATE_ORDERS=1;;
    d ) DEBUGGING=1;;
    * ) echo $usage;
        exit 1;;
  esac
done