Shell Scripting Lesson 5 - Working With Numbers

In this tutorial I am going to explain how to work with numbers in shell scripting. Sometimes we have to do simple mathematical operations with Number.

In Shell Scripting, Mathematical Calculations can be done by using expr Command. See the Example below.

$expr operand1 mathematical_operation operand2

Example

$ expr 3 + 2
$ expr 10 - 2
$ expr 9%2
$ expr 10 \* 3     #multiplication of 10 and 3

If you print output of a Mathematical Calculation, Use ` (tilde ~)  Key before and after the Mathematical Expression. See the Example Below.

Example

$ echo `expr 6 + 3`

That's All For Today !