proper way to detect shell exit code when errexit option set

Question

I prefer to write solid shell code, so the errexit & nounset is alway set.

The following code will stop at bad_command line

#!/bin/b         


        

Answer 1

I cobbled together a (hopefully) textbook example from all the answers:

#!/usr/bin/env bash

# exit immediately on error
set -o errexit

file='dfkjlfdlkj'
# Turn off 'exit immediately on error' during the command substitution
blah=$(set +o errexit && ls $file) && rc=$? || rc=$?
echo $blah
# Do something special if $rc
(( $rc )) && echo failure && exit 1
echo success