Providing parameter defaults

Within bash parameters, there are named spaces in the memory that allow us access to stored values. There are two types of parameters:

• Variables
• Special parameters

Variables

We already described what variables are and how to define them in Chapter 1, The What and Why of Scripting with Bash.

Just to refresh your memory, you can define a variable by assigning a value with an equals sign and without any spaces like this:

#!/bin/bash
myvar=15
myvar2="welcome"

So nothing new here.

Special parameters

Special parameters are the second...