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.