Use: dirfits [-k key[,...]] [-f] [-m sss] [-w ws_subst] FITSfile...
	Options:
	-k key1,key2,...	Optional list of keys to extract.
	               	Default keys are DATE-OBS,UTC,ELAPTIME,OBJECT
			All keys are converted to uppercase,and values are
			printed in the same order as input.
	-f		Do not print filename.
	-m sss		What to substitute for missing keys; def = "".
	-w ws_subst	What to substitute for runs of w/s; def = no subst.