One dumb question

[Ehud Karni]

On Mon, 18 Jun 2001 11:46:39 -0400, David A. Cobb <superbiskit@home.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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