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From: hfavr@mtuxo.UUCP (a.reed)
Newsgroups: net.unix,net.unix-wizards
Subject: Re: Negative if in Bourne (and C) SHELL
Message-ID: <1899@mtuxo.UUCP>
Date: Sun, 17-Aug-86 20:01:02 EDT
Article-I.D.: mtuxo.1899
Posted: Sun Aug 17 20:01:02 1986
Date-Received: Tue, 19-Aug-86 02:45:45 EDT
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Organization: AT&T Information Systems Labs, Holmdel NJ
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Xref: watmath net.unix:8921 net.unix-wizards:19255

> Here's something I've wanted to do for a while but I can't seem to find the
> way to do it.
> 
> In the csh you can do something like
> 
> ls foo
> if (! $status) then
>    echo "foo exists"
> endif
> 
> The  key  thing  here  is  the  ability  to NOT the value of status. How is
> this similar thing done in Bourne shell.
> 
> if ! ls foo
> then
> 	echo foo does not exist
> fi
> 
> In  summary,  how can I take the logical NOT of a command's return value in
> the Bourne shell (which is God's gift to U**X :-)?
> -- 
> "Life is but a dream" - Lope de Vega
>     "...for some and a NIGHTMARE for others!" Merlin, "Excalibur", the movie
> Disclaimer?  What disclaimer?  I can back everything up with as much 
> drivel as you like!

Use "else", i.e.:

if ls foo
	then
		echo '\c'
	else
		echo foo does not exist
	fi
					Adam Reed (ihnp4!npois!adam)