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Re: Pipe "make" stdout and stderr to process?
- To: "Karr, David" <david dot karr at cacheflow dot com>
- Subject: Re: Pipe "make" stdout and stderr to process?
- From: Sandeep Tamhankar <sandman at Interwoven dot com>
- Date: Thu, 05 Jul 2001 16:01:10 -0700
- CC: "'cygwin at cygwin dot com'" <cygwin at cygwin dot com>
- References: <2C08D4EECBDED41184BB00D0B74733420473EDEE@exchanger.cacheflow.com>
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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