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 ...

Yes, that’s the exit code and it’s meant to indicate that the pwd command you just used ran without any errors. An exit code of 0 always indicates that no problems were encountered.

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.

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 ...

The exit command in quotes, by the way, is necessary or else the script will attempt to keep running. Of course, in an embedded system, you might want that behavior, too.

However, you can easily create a shell script that contains a file — even an archive of many files — and then retrieve the file and act on it at run time.