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From: rde@ukc.ac.uk (R.D.Eager)
Newsgroups: net.micro.pc,net.micro
Subject: Re: null as variable in batcg fileh file
Message-ID: <754@eagle.ukc.ac.uk>
Date: Wed, 12-Feb-86 04:16:43 EST
Article-I.D.: eagle.754
Posted: Wed Feb 12 04:16:43 1986
Date-Received: Fri, 14-Feb-86 06:24:02 EST
References: <533@whuts.UUCP>
Reply-To: rde@ukc.UUCP (R.D.Eager)
Distribution: net
Organization: U of Kent at Canterbury, Canterbury, UK
Lines: 22
Xref: linus net.micro.pc:6732 net.micro:12591

In article <533@whuts.UUCP> 2212msr@whuts.UUCP writes:
>Does anyone know how to detect a null as variable input in a batch file?
>Specifically:
>
>foo %1   --how do I detect case where %1 is omitted, thus avoiding
>	   an error?  I've tried 'if %1=='':goto xx' as well as
>==' '


I remember a way to do this from my version 6 days (ah, when life was simple..)

It works on MS-DOS 2.11 anyway!

     if %1x == x ......
-- 
           Bob Eager

           rde@ukc.UUCP
           rde@ukc
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           Phone: +44 227 66822 ext 7589