In programming, a function is a reusable code structure that allows you to regroup and encapsulate multiple instructions that are part of the same logic.

It allows you to re-run these instructions multiple times from different parts of a script, without manually repeating them.

In short, you can think of a function as a mini-script within the script.

Defining functions

To define a function in Bash, you can use the following syntax:

function_name () {  instructions}

Where:

• function_name is the name of the function.

• instructions are the set of instructions executed by the function.