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From: mikep@ism780c.UUCP (Michael A. Petonic)
Newsgroups: comp.unix.questions
Subject: Re: Environment variables
Message-ID: <7173@ism780c.UUCP>
Date: Wed, 26-Aug-87 21:59:12 EDT
Article-I.D.: ism780c.7173
Posted: Wed Aug 26 21:59:12 1987
Date-Received: Sat, 29-Aug-87 10:13:35 EDT
References: <626@unmvax.unm.edu> <2876@phri.UUCP>
Reply-To: mikep@ism780c.UUCP (Michael A. Petonic)
Organization: Interactive Systems Corp., Santa Monica CA
Lines: 21

In article <2876@phri.UUCP> roy@phri.UUCP (Roy Smith) writes:
>In <626@unmvax.unm.edu> mike@turing.UNM.EDU.UUCP (Michael I. Bushnell) writes:
>> How can I determine if an environment variable is set using csh?
>> (I.e., in a script)  
>
>	After a bit of experimentation, I came up with the following
>
 [...]

A better was is to use printenv and the "status" variable, like this:
	printenv FOO > /dev/null
	if ( $status == 1 ) then
		variable is not set
	else
		variable is set
	fi

or something like that.  Look at the man page near the bottom for
the return values of printenv.

MikeP