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Date: Tue, 19 Jun 2001 18:58:55 +0300
Message-Id: <200106191558.SAA24155@linux.>
From: "Ehud Karni" <ehud AT unix DOT simonwiesel DOT co DOT il>
To: "\"\"David A. Cobb\"\"" <superbiskit AT home DOT com>
Subject: Re: One dumb question
CC: cygwin AT cygwin DOT com
In-reply-to: <5.1.0.14.0.20010618114229.03d27610@mail> (message from David A.
	Cobb on Mon, 18 Jun 2001 11:46:39 -0400)
Organization: Simon & Wiesel Insurance agency
Reply-to: ehud AT unix DOT simonwiesel DOT co DOT il
References:  <5 DOT 1 DOT 0 DOT 14 DOT 0 DOT 20010618114229 DOT 03d27610 AT mail>
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On Mon, 18 Jun 2001 11:46:39 -0400, David A. Cobb <superbiskit AT home DOT com> wrote:
> Is there a way to get the "current" bash shell to tee its output to a
> logfile?  I remember doing something like this once upon a time but I don't
> recall what I did and I was using a different shell (ksh on an HP/UX).

You can achieve it by the following 3/4 commands:

exec 3>&1                  # create pipe (copy of stdout)
exec 1>bash.dbg            # direct stdout to file       
##  exec 2>&1              # uncomment if you want stderr too
tail -f bash.dbg >&3 &     # run tail in bg              
                           
If you don't redirect stderr, the order of stdout and stderr messages
may be out of original order.

Here is a sample script that tested this on both Linux and Cygwin.

#! /bin/sh -ex

exec 3>&1
exec 1>bash.dbg
    exec 2>&1
tail -f bash.dbg >&3 &

: rest of script

echo "aaa bbb ccc"
: "stderr only"
sleep 5
echo "ddd eee fff"
########### end of test ###########

Ehud.


--
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