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.

Step 4: Press “Esc” to exit this mode. Then type “:w” to save your script. Once saved, the shell script will appear as below. Step 5: When you’re back to the console, type “:q”. Then write: bash ...

Step-by-step shell script execution Follow these steps to create and run a shell script of your own from your Ubuntu home directory: Create a directory to store your shell script Create a file in your ...

On some Linux systems (like Fedora), the script command also makes it possible to separate input from output in your session recording using the -I (or –log-in) and -O (or –log-out) options.

Knowing how to work with and display exit codes on the Linux command line or in scripts can help make errors more obvious.