Bash Shell Scripting Tutorial 9 - Variables

00:00:00 Introduction
00:01:40 Rules for Defining Bash Variables
00:04:30 System Defined Bash Variables
00:08:40 User Defined Bash Variables
00:10:10 Working of Bash Variables
00:12:09 Global vs Local Variables

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Topics Covered:
1. Introduction
2. Bash Scripting
3. Linux Filesystem and File Permissions
4. Absolute vs Relative Path
5. Hello World! Bash Script
6. Echo Command
7. Comments
8. Quotes
9. Variables
10. Command Substitution
11. Command Line Arguments
12. Read User Input

Variable is known as the temporary storage for any kind of data like integer, float, char, etc. A variable name can include alphabets, digits, and underscore, and its name can be started with alphabets and underscore only.

You don't have to define the data type of any variable at the time of variable declaration. Bash variables are untyped, which means just type the variable name by assigning its value, and it will automatically consider that data type.

Bash (Bourne Again Shell) is a command line interpreter that typically runs in a text window where user can interpret commands to carry out various actions. The combination of these commands as a series within a file is known as a Shell Script. Bash can read and execute the commands from a Shell Script.

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