usage:  expchk [options] <keyrec files>
	options:
		-all		show all zones
		-expired	show expired zones
		-valid		show valid zones
		-warn <num>	warn if expiration in <num> days
		-zone <name>	show the specified zone only
		-count		only show the count of matching zones
		-help		display this help message
		-Version	display version number
