Bash script to exit when any command (including non-simple commands) fail

Question

I have a script

#! /bin/sh
set -eux

command_a

command_b | command_c

while [ true ]; do
    command_d
done

I'd like this to fail when any command fails. If command_a fails, the script fails, but if command_b or command_d (not sure about command_c) fail, the script carries on.

Answer 1

This should not happen if you are using set -eux, may be I can tell better if I knew the actual command. One way to achieve exiting can be to use ||

while [ true ]; do
    command_d || exit 1
done

a || b means "do a (completely). If it didn't succeed, do b"

Also, you should use set -euxo pipefail

Refer this: https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/