Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Chapter 8

1. What is a variable? A variable is a basic building block for programming languages, which is used to store run-time values that can be referenced multiple times in the application.
2. Why do we need variables? Variables are great for storing information you need multiple times. In this case, if you need to change the information, it's a single operation (in the case of a constant). In the case of a real variable, it allows us to reference run-time information in the program.

Lastly, proper variable naming allow us to grant extra context to our script, increasing readability.

3. What is a constant? A constant is a special type of variable, since its value is determined is fixed and used throughout the script. Normal variables are often ...