shell-base/script

#!/bin/sh

usage() {
	printf "Usage: %s [-h]\n" "$0"
}

help() {
    cat << EOH
 SYNOPSIS
    $0 [-h]

 DESCRIPTION

    $0 does things!

 OPTIONS

    -h    Show this help
EOH
}

on_interrupt() {
	print "Process aborted!\n"

	exit 130
}

main() {
	while getopts "hf:" option; do
		case "${option}" in
			h) help; exit 0;;
			f) FOO="$OPTARG";;
			*) usage; exit 1;;
		esac
	done

	FOO="${FOO:-defaultValue}"

	exit 0
}

trap on_interrupt INT

main "$@"