An exit code other than 0 indicates that a script or a command has failed in some way. Learn more about exit codes and the types of errors they represent in this post.

Simple Linux Shell Scripts in Bash, Python, and Perl That Will Get You Up and Running by George Whittaker on July 16, 2024 ...

Each Linux command returns an exit code, with 0 indicating success and non-zero values indicating failure. You can use the $? variable to access the exit code and control program flow in scripts ...