Shell Scripting By Udemy

 echo $SHELL   

chsh -s /bin/bash

Class 02 [ Shells vs Scripts ]

• What is the Bash shell is 
•  A "Program" that "interprets" the commands you type in your terminal and "passes" them on to the "Operating System".
• 
  
• BASH = Bourne Again Shell
• Based on the Bourne Shell (sh), Created by Stephen Bourne in 1979.
• its feature-rich.
• Its fast
• Its very common.
• The difference between shell and scripts
• A Shell script is a file containing commands for the shell.
• A Bash script is simply a file containing commands for the Bash shell.
• Why Bash is more popular
• Why Scripting is a useful skill to learn...

Questions

1. What is a bash script?
1. A Bash script contains a list of commands specifically for the Bash shell.
2. A shell is a program that interprets commands and passes them on to the operating system?
1. True
3. A benefit of bash is that it has a lot of features
1. True
4. Why should you write a script?
1. The main benefits of writing scripts is to help you automate tasks and save you time

Class 03 [ Bash Script Structure - Part 1 - Core Components ]

• file <File_name>
• #!/bin/bash----------------------------------------------> Shebang line
• #!/usr/bin/python3
• Exit Statement  ( 0 = Sucessfull ; 1-255 = Unsucessfull )

• #!/bin/bash
• echo "This is my first Script"
• exit 0

after that, we need to check the permission of the particular file.

ls

give permission to the file

chmod +x <File_name>

run the file

./<File_name>

Class 04 [ Bash Script Structure - Part 2 - Professional Components ]

 Comments:

   Single line Comments -----------#

   Double line Comments----------

# Author: Y Reddy Sekhar

# Date Created: 10-11-2022

# Last Modified: 10-11-2022

# Description 

# Prints "This is my first script" to the terminal

# Usage

# Provide file name here...

Class 05 [ Setting up Secure Script Permissions ]

• The basics of file permissions
• Setting file permission on your script

ls-l

chmod 744 <File_name>

chmod 777 <File_name>

Class 06 [ Project: Backup Script ]

File downloaded on your personal computer go and see it...

 

Class 07 [ Backup Script - Project Solution ]

                    While doing practice watch again.

Class 08 [ Adding scripts to your PATH ]

• What is the PATH Variable?
• How to add directories to your PATH Variable

echo "$PATH"

Class 09 [ Section Summary ]

        Document downloaded