#!/bin/bash
#  parameters.sh
#  Demonstration/sample code of how to require a fixed number of parameters to be passed
#  If that number ($ARGS) is not met, display help
#  This example requires 2 arguments ... -t target_volume
#  -h and -? are offered to the user as the suggested "help" parameters because they are the
#. typical UNIX help parameters.  In reality, anything except "-t target_volume" will display_help.

display_help ()
{
#	clear
	echo
	echo "Usage:"
	echo "    `basename $0` [ -t target_volume | -h | -? ]"
	echo
	echo "Description:"
	echo "     Installs all software packages of the ALCO image to the specified target computer."
	echo
	echo "Options:"
	echo "    `basename $0`  -t target_volume  -->  Specify the target_volume for the installations."
	echo "    `basename $0`  -h                -->  Display this help file."
	echo "    `basename $0`  -?                -->  Display this help file."
	echo

	exit $ERR_ARGS
}

# Require this many arguments
# arg1 & arg2: -t TARGET_VOLUME
# anything else displays help
ARGS=2

# Error codes
ERR_ARGS=65  ## incorrect number or type of arguments

if [[ $# != "$ARGS" ]]; then
	display_help
else  # 2 arguments were passed
	while [ $# -gt 0 ] ; do
		case "$1" in
			-t)
				TARGET_VOLUME="$2"
				shift
			;;

			*)
				display_help
			;;
        esac
        shift
	done
fi

if [[ -n "$TARGET_VOLUME" ]]; then
	echo "TARGET_VOLUME = $TARGET_VOLUME"
fi

exit 0