How to determine if there is an error in a process group (pipeline)?

Question

bash

Hello.
Let's say that in the pipeline:
prog1 | prog2 | prog3
an error occurred in prog2.
How to get a return code? Is it a variable $? contains the return code of the last command (prog3 in this case).
In particular, I need to somehow make sure that the commands through the pipeline are executed without errors. After that, the execution of the underlying code will become possible.

Answer 1

Use set -o pipefail in front of the container