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From: prakash@fyrpwr.enet.dec.com (Mayank Prakash)
Newsgroups: comp.unix.shell
Subject: Re: I/O Redirection question
Message-ID: <22107@shlump.nac.dec.com>
Date: 17 Apr 91 14:26:34 GMT
References: <1991Apr11.144844.28800@riacs.edu> <BROWNING.91Apr15152400@ew10.nas.nasa.gov>
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Reply-To: prakash@aiag.enet.dec.com
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Organization: Digital Equipment Corporation, Marlboro, MA.
Lines: 44

In article <BROWNING.91Apr15152400@ew10.nas.nasa.gov>, browning@nas.nasa.gov (David S. Browning)
writes:
|->In article <1991Apr11.144844.28800@riacs.edu> dwsmith@loki.arc.NASA.GOV (David Smith) writes:
|->
|->   I have a question regarding I/O redirection.  I have a program in which
|->   writes to stdout and stderr.  I have redirected both of these to a file.
|->
|->   Now comes the problem.  I need to capture stdout in a file along with
|->   stderr, but I also need stdout to go to the terminal for prompting of
|->   input.  Is this possible?  If so, how does one do this?
|->
|->I have a related question.  Is it possible, in csh, to redirect stdout
|->and stderr to different files?  Or to redirect stderr and not stdout?
|->I know how to do it in sh/ksh, but not in csh.
|->
|->Thanks,
|->David
|->
--

In csh, try the following -

(cmd > outfile) >& errfile

to send stdout of cmd to outfile, and stderr to errfile. To redirect
stderr, and not stdout, is a bit harder. If stdout is the terminal, the
following would work -

(cmd | tee /dev/tty > /dev/null) >& errfile

It should give you ideas of how to do it in general.

-mayank.

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