Bash provides a way to create functions, groups of commands that can be set up inside a script and invoked as a group. Functions can therefore be run as often or as infrequently as needed.

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 you use ALSA for sound on your system the functions contained in the script presented here can be used to get and set the volume on your system. You might use this if you had a monitoring script ...