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From: maart@cs.vu.nl (Maarten Litmaath)
Newsgroups: comp.unix.questions
Subject: Re^4: Bourne Shell: Variable defined?
Summary: use && and || operators
Message-ID: <2209@solo2.cs.vu.nl>
Date: 23 Mar 89 12:47:15 GMT
References: <1819@umbc3.UMBC.EDU> <9899@smoke.BRL.MIL> <2202@solo1.cs.vu.nl> <1605@fig.bbn.com> <16505@mimsy.UUCP>
Organization: V.U. Informatica, Amsterdam, the Netherlands
Lines: 14

chris@mimsy.UUCP (Chris Torek) writes:
\	if [ "${vax+X}" ]; then echo is set; else echo not set; fi
             ^        ^
	     not needed

[ ${foo+bar} ] && echo core || echo dumped

(In the mythical True C Shell one can say:

	echo $?foo ? core : dumped
)
-- 
 Modeless editors and strong typing:   |Maarten Litmaath @ VU Amsterdam:
   both for people with weak memories. |maart@cs.vu.nl, mcvax!botter!maart