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Redirect all subsequent commands' stderr using exec

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Original source (unix.stackexchange.com)
Tags: bash shell-scripting stream-manipulation
Clipped on: 2017-11-15

I have a bash file that I need to redirect all output to one file, debug log as well as to the terminal. I need to redirect both stdout and stderr to the debug and log it for all commands in the script.

I do not want to add 2>&1 | tee -a $DEBUG for every single command in the file. I could live with | tee -a $DEBUG.

I remember there was a way to do it with something like exec 2>&1.

Currently I'm using something like the following:

#!/bin/bash
DEBUGLOG=/tmp/debug
exec 2>&1
somecommand | tee -a $DEBUGLOG
somecommand2 | tee -a $DEBUGLOG
somecommand3 | tee -a $DEBUGLOG

but it does not work. Does anyone have a solution/can explain the cause?

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