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From: fwb@siemens.UUCP
Newsgroups: net.micro
Subject: Re: null as variable in batcg file
Message-ID: <22700002@siemens.UUCP>
Date: Tue, 11-Feb-86 08:50:00 EST
Article-I.D.: siemens.22700002
Posted: Tue Feb 11 08:50:00 1986
Date-Received: Fri, 14-Feb-86 07:28:48 EST
References: <533@whuts.UUCP>
Lines: 14
Nf-ID: #R:whuts:-53300:siemens:22700002:000:411
Nf-From: siemens!fwb    Feb 11 08:50:00 1986


> 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
> ==' '

Try
	if %1X == X goto null

-----------------------------------------------------
Frederic W. Brehm       (ihnp4!princeton!siemens!fwb)
Siemens Research and Technology Laboratories