Arithmetic operators

Arithmetic operators do what you think they do, that is, add, subtract, divide, and so on. It is something we are familiar with even without specific programming knowledge. Let's see each of them and how they can be used to manipulate the value of variables.

Before proceeding, keep in mind that for a shell script, a number is a decimal unless you prefix that with a 0 for the octal, a 0x for a hexadecimal number, or a base#number for a number that evaluates on the base.

The + operator

This is like what we see at primary school; this operator allows us to add an integer to the value of the variable, as we can see in the following example:

#!/bin/bash
echo "Hello user, please give me a number: &quot...