Exit when one process in pipe fails

Question

The goal was to make a simple unintrusive wrapper that traces stdin and stdout to stderr:

#!/bin/bash

tee /dev/stderr | ./script.sh | tee /dev/stderr

exit          


        

Answer 1

I think that you're looking for the pipefail option. From the bash man page:

pipefail

If set, the return value of a pipeline is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands in the pipeline exit successfully. This option is disabled by default.

So if you start your wrapper script with

#!/bin/bash

set -e
set -o pipefail

Then the wrapper will exit when any error occurs (set -e) and will set the status of the pipeline in the way that you want.