A shell script is a list of commands in a computer program that is run by the Unix shell which is a command line interpreter. A shell script usually has comments that describe the steps. The different operations performed by shell scripts are program execution, file manipulation and text printing.

Module 1: Introduction to Shell Scripting

• What is Shell and Shell Scripting?
• Types of Shells (e.g., Bourne Shell, Bash, etc.)
• Advantages and Use Cases of Shell Scripting
• Understanding the Command Line and Terminal

Module 2: Shell Script Basics

• Writing Your First Shell Script
• How to Execute a Shell Script
• Script File Permissions (chmod)
• Adding Comments in Scripts

Module 3: Shell Script Components

• Variables:
• Defining and Using Variables
• Environment vs Local Variables
• Input and Output:
• echo and read commands
• Redirecting Input/Output (>, >>, <)
• Using Quoting (“, ‘, and `)

Module 4: Conditional Statements

• if, if-else, and if-elif-else Statements
• Logical Operators (-eq, -ne, -lt, -gt, -le, -ge)
• Test Command and [ ]
• Case Statements (case-esac)

Module 5: Loops in Shell Scripting

• for Loops
• while Loops
• Using break and continue
• Module 6: Functions in Shell Scripts

Module 6: Functions in Shell Scripts

• Defining and Calling Functions
• Passing Arguments to Functions
• Returning Values from Functions
• Scope of Variables in Functions

Module 7: Working with Files and Directories

• File Testing Operators (-e, -d, -f, etc.)
• Reading and Writing Files
• Manipulating Files (mv, cp, rm, find, grep, etc.)
• Working with Directories (mkdir, rmdir, cd, pwd)

Module 8: Advanced Shell Features

• Command Substitution ($(command) or `command`)
• Working with Arrays
• Using awk and sed for Text Processing
• Using Regular Expressions

Module 9: Debugging and Best Practices

• Debugging Scripts (set -x and set +x)
• Error Handling in Shell Scripts
• Writing Modular and Reusable Code
• Best Practices for Writing Clean Scripts

Module 10: Real-World Applications

• Automating Backup Scripts
• User and System Management Scripts
• Log Analysis Scripts
• Scheduling Scripts with cron