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From: boykin@datagen.UUCP
Newsgroups: net.micro,net.micro.pc
Subject: Re: null as variable in batch file
Message-ID: <22@datagen.UUCP>
Date: Fri, 14-Feb-86 18:37:10 EST
Article-I.D.: datagen.22
Posted: Fri Feb 14 18:37:10 1986
Date-Received: Sun, 16-Feb-86 08:43:10 EST
Organization: Data General Distributed Systems, Westborough, MA
Lines: 17
Xref: linus net.micro:12611 net.micro.pc:6784

<Max S. Robin writes:>
>foo %1   --how do I detect case where %1 is omitted, thus avoiding
>	   an error?  I've tried: 
>                       if %1==''
>                       if %1==' '
>                       if %1==<CTRL @>
>           all to no avail.  Any help or pointers would be appreciated.

I use the following to test for a null (non-existent) argument:

	IF '%1' == ''

Joe Boykin
Sr. Project Leader
Data General Corp.
{allegra, ihnp4, decvax}!datagen!boykin