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From: roy@phri.UUCP (Roy Smith)
Newsgroups: comp.unix.questions
Subject: Re: Environment variables
Message-ID: <2876@phri.UUCP>
Date: Tue, 25-Aug-87 09:33:12 EDT
Article-I.D.: phri.2876
Posted: Tue Aug 25 09:33:12 1987
Date-Received: Thu, 27-Aug-87 02:13:28 EDT
References: <626@unmvax.unm.edu>
Reply-To: roy@phri.UUCP (Roy Smith)
Organization: Public Health Research Inst. (NY, NY)
Lines: 33

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

----------------
#!/bin/csh

if (`printenv FOO`X == X) then
	echo FOO is not set
else
	echo FOO is set
endif

if (`printenv TERM`X == X) then
	echo TERM is not set
else
	echo TERM is set
endif
----------------

which gives me:

FOO is not set
TERM is set

	This works, but is a bit grotty.  I suspect there has to be a
prettier way to do it, but I don't see any.
-- 
Roy Smith, {allegra,cmcl2,philabs}!phri!roy
System Administrator, Public Health Research Institute
455 First Avenue, New York, NY 10016