COURSE OUTLINE

1. Introduction to Bash and Shell Scripting

1.1 What is a Shell

• Definition of a shell
• Role of shell in operating systems
• Shell vs terminal vs command line

1.2 Introduction to Bash

• What is Bash
• History and features
• Bash vs other shells

1.3 Shell Environments

• Interactive shell
• Non-interactive shell
• Login shell

1.4 Installing and Accessing Bash

• Using Bash on Linux
• Using Bash on macOS
• Using Bash on Windows (WSL)

Example Linux systems:

• Ubuntu
• Red Hat Enterprise Linux

2. Linux Command Line Basics

2.1 Navigating the File System

• pwd
• ls
• cd

2.2 File Operations

• cp
• mv
• rm
• mkdir

2.3 Viewing File Contents

• cat
• less
• head
• tail

2.4 File Permissions

• chmod
• chown
• umask

3. Introduction to Bash Scripts

3.1 What is a Bash Script

• Shell commands vs scripts
• Use cases of scripts

3.2 Creating Your First Script

Example:

#!/bin/bash

echo "Hello DevOps"

3.3 Script Execution

• Making scripts executable
• Running scripts

chmod +x script.sh

3.4 Script Structure

• Shebang (#!/bin/bash)
• Comments
• Command execution

4. Variables in Bash

4.1 What is a Variable

• Variable concept in Bash

4.2 Declaring Variables

Example:

name="DevOps"

4.3 Accessing Variables

echo $name

4.4 Environment Variables

Common variables:

• PATH
• HOME
• USER

4.5 Exporting Variables

export VAR=value

5. Input and Output

5.1 Printing Output

echo "Hello"

5.2 Reading User Input

read username

5.3 Formatting Output

• escape characters
• multiline output

6. Bash Operators

6.1 Arithmetic Operators

• addition
• subtraction
• multiplication

6.2 Comparison Operators

• -eq
• -ne
• -gt
• -lt

6.3 Logical Operators

• AND (&&)
• OR (||)
• NOT (!)

7. Conditional Statements

7.1 if Statements

7.2 if-else Statements

7.3 Nested Conditions

7.4 Case Statements

Example:

8. Loops in Bash

8.1 For Loop

8.2 While Loop

8.3 Until Loop

8.4 Loop Control

• break
• continue

9. Bash Functions

9.1 Creating Functions

9.2 Calling Functions

9.3 Function Parameters

9.4 Returning Values

10. Working with Files and Text Processing

10.1 File Handling in Bash

• reading files
• writing files

10.2 Text Processing Tools

grep

Search text patterns

awk

Data extraction

sed

Stream editing

cut

Column extraction

sort

Sorting data

11. Process Management

11.1 Understanding Processes

• foreground processes
• background processes

11.2 Managing Processes

Commands:

• ps
• top
• kill

11.3 Job Control

• jobs
• bg
• fg

12. Bash Script Arguments

12.1 Passing Arguments to Scripts

Example:

./script.sh file.txt

12.2 Positional Parameters

• $0
• $1
• $2

12.3 Special Variables

• $#
• $@
• $?

13. Bash Error Handling

13.1 Exit Codes

exit 1

13.2 Checking Command Success

if [ $? -eq 0 ]

13.3 Debugging Bash Scripts

set -x

14. Bash Automation for DevOps

14.1 System Administration Automation

Examples:

• Disk monitoring
• Service restart
• Backup scripts

14.2 Log Monitoring

• Searching logs
• Alert scripts

14.3 Cron Jobs

Scheduling automation

Example:

crontab -e

15. Bash in CI/CD Pipelines

Automating pipelines in:

• Azure DevOps
• GitLab
• Jenkins

Examples:

• build scripts
• deployment scripts
• testing automation

16. Bash with Containers

16.1 Bash in Docker

Automation with:

• Docker

Examples:

• container start scripts
• container health checks

17. Security Best Practices

• Secure script writing
• Avoiding credential exposure
• Permission management
• Secure automation pipelines

18. Bash Script Optimization

• Script performance
• Efficient loops
• Parallel execution
• Resource management

20. DevOps Automation Projects

Project 1

Server health monitoring script

Project 2

Automated backup system

Project 3

Log monitoring and alerting

Project 4

Deployment automation script