When writing bash scripts or running something on command line, last command exit code status is stored in environment variable
$?. It can also be used to get exit code of subshell command
$(). Here is example bash code showing how you can use it.
ls /etc/passwd_non_existing > /dev/null 2>&1 echo "exit code: $?" ls /etc/passwd echo "exit code: $?" somevar=$(ls /etc/passwd_non_existing) echo "exit code: $?"
exit code: 2 /etc/passwd exit code: 0 exit code: 2
Env: GNU bash, version 4.2.46