If you run a bash script while using a different shell, this line ensures that bash—and not your current shell—will run the commands included in the script.

I have a bash script that needs to be able to mount/umount and write to a DVD burner. It all works when it is run as root, but even if I chmod u+s it and leave it owned as root, my other user ...

Do you want to create a Shell script in your Linux system? This guide will take you through how to create a shell script using multiple text editors, how to add comments, and how to use Shell ...

Bash functions can group related commands in Linux and run them as frequently or infrequently as needed. They can also make scripts more readable by organizing commands by the roles they play.

If your script consumes excessive CPU time and RAM, or generates a lot of network bandwidth or disk thrashing, limiting its execution to one instance at a time is common sense.