From: utzoo!henry Newsgroups: hacknews Title: non command Article-I.D.: utzoo.2114 Posted: Tue Jun 1 22:01:05 1982 Received: Tue Jun 1 22:01:05 1982 Minor new utility: non, a logical-not command for shell programming. E.g.: if non cmp -s file1 file2 then echo file1 file2 differ fi Arguably it ought to be called "!", but there are reasons for not doing this -- that is a special character in some circumstances.