#!/bin/sh

usage() { echo "Usage: shutdown <-p|-r>"; }

main() {
	while [ "$1" ]; do
		case "$1" in
			-p|--poweroff) init_signal='10';;
			-r|--reboot) init_signal='2';;

			-h|--help|--usage) usage; return;;
			*) usage; return 1
		esac
		shift
	done

	exe_name="${0##*/}"

	[ "$init_signal" ] || {
		case "$exe_name" in
			poweroff) init_signal='USR1';;
			reboot) init_signal='INT';;
			*) usage; return 1;;
		esac
	}

	kill -s "$init_signal" 1
}

main "$@"