how to redirect inside bash script, BUT...

[shaybery]

I want to do the following redirectin inside a bash script :
1. all the stdout will be redirected to a /tmp/log
2. all the errors will go to the stderr and also to the /tmp/log.

The following inside a bash script is not working, WHY and HOW to do it:

#!/bin/bash
exec 1>/tmp/log
exec 2> > (tee -a /tmp/log)
....
rest of the bash script.

[shaybery]

Anyone can help on that?

[barriehie]

This link might help.
BASH Programming - Introduction HOW-TO: All about redirection

[shaybery]

I didn't find the answer to my question in the link(BASH Programming - Introduction HOW-TO: All about redirection).

This link has a basic redirection example, and want I need it a bit complicated redirection issue.

[lomcevak]

I think what you'll have to do is create a child process running tee and use a named pipe to redirect stderr to it. That way stderr will print on the terminal and to the log.

#!/bin/bash
npipe=/tmp/$$.tmp
trap "rm -f $npipe" EXIT
# Delete named pipe on script exit
mknod $npipe p
# Create the named pipe
tee <$npipe -a /tmp/log &
# Create child process running tee with stdin redirected to named pipe
exec 1>/tmp/log
# Redirect stdout to log
exec 2>&-
# Close stderr
exec 2>$npipe
# Open stderr on named pipe