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 ...

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

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 ...

The Linux script command has been around for ages and provides a simple but useful service. It lets you record command line activity – both input and output.

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.

It's not hard to create and run a shell script in Linux distros like Ubuntu, but there are a few non-obvious pitfalls you need to avoid. Here's a quick example of how to execute a script in Linux.

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.