#!/bin/bash
# Script:	template.sh
# Task:	Template for creating own scripts. Already contains
#		basic elements (usage-funkcion, parsing of commandline
#		options with getopts and predefined variables)

# global variables
SCRIPTNAME=$(basename ${0} .sh)

EXIT_SUCCESS=0
EXIT_FAILURE=1
EXIT_ERROR=2
EXIT_BUG=10

# variables for option switches with default values
VERBOSE="n"
OPTFILE=""

# functions
function usage {
	echo "Usage: ${SCRIPTNAME} [-h] [-v] [-o arg] file ..." >&2
	[[ ${#} -eq 1 ]] && exit ${1} || exit ${EXIT_FAILURE}
}

# the options -h for help should always be present. Options -v and
# -o are examples. -o needs a parameter, indicated by the colon ":"
# following in the getopts call
while getopts ':o:vh' OPTION ; do
	case ${OPTION} in
		v)	VERBOSE=y
			;;
		o)	OPTFILE="${OPTARG}"
			;;
		h)	usage ${EXIT_SUCCESS}
			;;
		\?)	echo "unknown option \"-${OPTARG}\"." >&2
			usage ${EXIT_ERROR}
			;;
		:)	echo "option \"-${OPTARG}\" requires an argument." >&2
			usage ${EXIT_ERROR}
			;;
		*)	echo "Impossible error. parameter: ${OPTION}" >&2
			usage ${EXIT_BUG}
			;;
	esac
done

# skip parsed options
shift $(( OPTIND - 1 ))

# if you want to check for a minimum or maximum number of arguments,
# do it here
if (( $# < 1 )) ; then
	echo "I need at least one argument!" >&2
	usage ${EXIT_ERROR}
fi

# loop through all arguments
for ARG ; do
	if [[ ${VERBOSE} = y ]] ; then
		echo -n "argument: "
	fi
	echo ${ARG}
done

exit ${EXIT_SUCCESS}