Introduction to Shell Scripting

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The shell is a program that provides the user with an interface to use the 
operating system’s functions through some commands. A shell script is a 
program that is used to perform specific tasks

Shell scripts are mostly used to avoid repetitive work. You can write 
a script to automate a set of instructions to be executed one after the other,
 instead of typing in the commands one after the other n number of time

A typical script might look like this:

#!/bin/bash
echo "Welcome!! Please Enter Your Name"
read name
echo "Hello $name"

Executing the file

Now that we have seen what a typical shell script looks like, 
let’s look at how to execute the file
1. Save the file with a .sh extension
2. To execute the file, first we need to give it execute permissions.
	- chmod +x filepath/filename.sh
3. To execute the file, we can do it in the following ways
- If you are using a GUI file navigation system, right-click on the file and click on run or execute.
- If you are using the terminal, ./filename.sh will execute the script. 
(Make sure you are in the correct directory!) 

Task list

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• Shell Basics
• Shell Permissions
• Shell Redirections
• Shell Variables and Expansions

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