Path: utzoo!attcan!uunet!ncrlnk!ncr-sd!hp-sdd!megatek!spot!hollen
From: hollen@spot.megatek.uucp (Dion Hollenbeck)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Interactive BAT files: here's how
Message-ID: <382@megatek.UUCP>
Date: 4 Oct 88 20:27:52 GMT
References: <8810040015.AA21729@decwrl.dec.com>
Sender: news@megatek.UUCP
Lines: 49

From article <8810040015.AA21729@decwrl.dec.com>, by birdsall@manana.dec.com:
>> Subject: Interactive BAT files: HOW?
>> Posted: 29 Sep 88 00:19:14 GMT
>> Organization: Evans & Sutherland, Salt Lake City, Utah
>  
>> I would like to alter my AUTOEXEC.BAT file (or another BAT file)
>> to accept interactive input.  [...stuff deleted...]
>  
> Is it "possible"? Why of course! All things are possible under MS-DOS ... 
> but it can be painful ...
> 
> Try this:
>   [...stuff deleted...]
> (consult your DOS reference manual ). The syntax is a bit obscure but this is
> how you branch on a specific errorlevel using a BAT file IF statement: 
> 
> 	if errorlevel 1 if not errorlevel 2 goto one:
> 	if errorlevel 2 if not errorlevel 3 goto two:
> 	goto exit:
> 	:one
> 		one statements 
> 		...
> 		goto exit
> 	:two

Walt has got approximately the right idea here and everything else he
says about he C programs is accurate.  

CAUTION!!
	If the above return values are tested in ascending order, when
the (implied) test "if errorlevel >= 1"  is made, it will be true,
even if the program returned 2 or 3 as the errorlevel.

FIX!!!
	Make sure all errorlevel numeric  tests test descendingly:

 	if errorlevel 2 if not errorlevel 3 goto two:
 	if errorlevel 1 if not errorlevel 2 goto one:

By the time you get to testing for 1, you have eliminated all values
above 1 and the true branch will indeed be true.



	Dion Hollenbeck             (619) 455-5590 x2814
	Megatek Corporation, 9645 Scranton Road, San Diego, CA  92121

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