AT-INVALID(1) General Commands Manual AT-INVALID(1) NNAAMMEE AAtt--iinnvvaalliidd - handling of an invalid AT&T UNIX argument DDEESSCCRRIIPPTTIIOONN no argument: AT&T UNIX valid argument: Version 7 AT&T UNIX invalid argument: AT&T UNIX murks end of file OpenBSD June 30, 2010 OpenBSD