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From: pwong@pixel.DEC (Paul H. Wong, DPS/Graphics, 264-7918)
Newsgroups: net.micro.pc
Subject: Re: null as variable in batch file
Message-ID: <1088@decwrl.DEC.COM>
Date: Wed, 12-Feb-86 11:10:19 EST
Article-I.D.: decwrl.1088
Posted: Wed Feb 12 11:10:19 1986
Date-Received: Thu, 13-Feb-86 20:26:44 EST
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 22

<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.

	This seems to work for me:

		if Z%1==Z

	- Paul

---------------------------------------------------------------------
Paul H. Wong
Digital Equipment Corp.
Merrimack, NH
(603)-884-7918

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