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Date:	Thu, 05 Jul 2001 16:01:10 -0700
From:	Sandeep Tamhankar <sandman AT Interwoven DOT com>
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To:	"Karr, David" <david DOT karr AT cacheflow DOT com>
CC:	"'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject:	Re: Pipe "make" stdout and stderr to process?
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You want:

make 2>&1 | filterprog

You want the redirection of stderr->stdout to apply to your first 
command and send the resulting stdout to the second command.

What's really fun is when you want to save stdout and stderr to a file 
AND print them to the screen.  That's what the tee program is for (it 
takes its stdin and writes it to stdout and a file).  So when I'm 
building something I'll often do something like this:

make 2>&1 | tee make.out

That way I can see that all's going well and know that there's a log 
file I can refer to later.  Although another way to accomplish the same 
thing is to just do

make > make.out 2>&1
tail -f make.out

The problem there is that I often get confused about whether the 2>&1 
should come before or after the > make.out.  I know the first way works, 
so I always do that.

-Sandeep

Karr, David wrote:

> How do I run "make" so I can pass both stdout and stderr to a filtering
> process?  I'm familiar with writing the output to a file, taking both stdout
> and stderr ("make > make.out 2>&1"), but I don't see how to get this to work
> if I just want to pipe the output (both stdout and stderr) to another
> process.  When I do "make | filterprog 2>&1", it seems to have no effect, in
> that it appears as if the stderr from "make" goes directly to the console.
>>From reading the "bash" man page, it almost seems as if redirection doesn't
> apply to piping.
> 
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-- 
---------------------------------------------
Sandeep V. Tamhankar			
Member of Technical Staff		
Tel: (408) 220-7505
Fax: (408) 774-2002
Email: sandman AT interwoven DOT com

Visit http://www.interwoven.com
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