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From: ok@cs.mu.oz.au (Richard O'Keefe)
Newsgroups: comp.unix.questions
Subject: Re: How do I ask "if NOT" in shell?
Message-ID: <2513@munnari.oz.au>
Date: 24 Oct 89 12:47:53 GMT
References: <28381@shemp.CS.UCLA.EDU> <3787@solo6.cs.vu.nl> <8243@cbmvax.UUCP>
Sender: news@cs.mu.oz.au
Lines: 12

When you really want to write
	unless command ; then
	    stmts
	fi
you can do it by writing
	command
	if test $? != 0 ; then # command failed
	    stmts
	fi

If stmts is sufficiently simple, you can also do
	command || { stmts }