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Date:	Sat, 26 May 2001 09:43:54 PDT
From:	"Steven Levine" <steve53@earthlink.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: errorlevel when piping ?

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In <3B0F5B48.5EDA@peterskye.com>, on 05/26/01
at 12:29 AM, Peter Skye said:

>Anybody have any info on this? Similarly, anybody know what "errorlevel"
>is returned to a subsequent "if errorlevel ..." statement when using &,
>&& and || unconditional/conditional command processing?

cmd.exe works like unix and the returned errorlevel is the errorlevel
returned by the last command in the pipe. The errorlevels are not passed.
If an upstream routine crashes, in unix at least, the pipe will closed
with error and the downstream routine will fail with the ubiquitous broken
pipe messsage. Other than that, the down stream routines usually have no
clue what's upstream which is part of the beauty of pipes.

What you want to do is easily handled in unix, the shells are infinitely
more capable than cmd.exe. If you really need to check failure you are
going to have to rewrite as:

cmd1 >tmpfile1
if errorlevel
cmd2

FWIW, cmdref.inf one of the worst of the IBM documents. Try finding a
definition of what >& or & does.

HTH,

Steven

--
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"Steven Levine" MR2/ICE 2.28a #10183 Warp4/FP11
www.scoug.com irc.webbnet.org #scoug (Wed 7pm PST)
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