Shell Scripting — From Beginner to Automation

A structured, hands-on Bash scripting repository containing lessons, practice labs, assignments, solutions, quizzes, posters, and progressively more advanced automation projects.

This project begins with true beginner concepts and introduces advanced topics only after the required foundations have been practiced.

Learning Method

Learn → Type → Run → Make Mistakes → Debug → Verify → Automate

Each learning day may include:

• Lesson notes
• Beginner-friendly command practice
• Hands-on assignment
• Separate instructor solution
• Interactive MCQ quiz
• Visual study poster
• Verification checklist

Current Course Progress

Day 1 — Shell and Bash Introduction

Topics:

• What a shell is
• Bash introduction
• Terminal versus shell
• Simple Linux architecture
• User → Shell → Kernel → Hardware
• Machine-information commands
• Basic file and directory commands
• Vim and Nano introduction
• Shebang and comments
• First Bash script
• Execute permission
• bash hello.sh versus ./hello.sh

Day 2 — Output, Variables, and User Creation

Topics:

• Standard output and standard error
• Successful and failed commands
• Exit status using $?
• && and ||
• Multiline descriptions
• Simple Bash variables
• Variable expansion
• User input with read
• Creating a Linux user with useradd
• Checking users with id and getent passwd
• Verifying the real command result before reporting success

Repository Structure

shell-scripting/
├── README.md
├── Day-01-Shell-Basics/
│   ├── Assignment/
│   ├── Solution/
│   ├── MCQ-Quiz/
│   └── Posters/
├── Day-02-Output-Variables-User-Creation/
│   ├── Assignment/
│   ├── Solution/
│   ├── MCQ-Quiz/
│   └── Posters/
└── Future-Days/

Empty directories are not stored by Git. Add a README.md or .gitkeep file when an empty directory must be preserved.

Beginner Rules

The scripts for each day use only concepts already taught by that point.

For example, the first beginner scripts do not use:

• Functions
• Arrays
• Loops
• Advanced argument parsing
• Strict mode
• Regular expressions
• Complex error-handling frameworks

These concepts will be introduced gradually in later lessons.

Basic Environment

You can practice using:

• Ubuntu Linux
• WSL Ubuntu on Windows
• A Linux virtual machine
• An approved AWS EC2 lab instance

Check the environment:

echo "$SHELL"
echo "$0"
bash --version
whoami
hostname
pwd

Running a Bash Script

Run a readable script through Bash:

bash hello.sh

Give the script execute permission and run it directly:

chmod u+x hello.sh
./hello.sh

Check its syntax:

bash -n hello.sh

No output from bash -n normally means no syntax error was found.

Working with Assignments and Solutions

Students should complete the assignment before opening the corresponding solution.

Recommended workflow:

1. Read the assignment.
2. Type every command manually.
3. Create the required scripts.
4. Test successful and failed cases.
5. Record errors and corrections.
6. Run the verification commands.
7. Compare the work with the solution.
8. Complete the MCQ quiz.

Safety Notes

• Use WSL, a disposable VM, or another approved Linux lab.
• Do not test user-management or deletion scripts on production systems.
• Do not manually edit /etc/passwd, /etc/shadow, or /etc/group.
• Never store plaintext passwords, tokens, private keys, or cloud credentials in Git.
• Check a command's result before printing a success message.
• Read scripts carefully before using sudo.

Planned Learning Roadmap

Stage	Topics
Foundation	Shell, Bash, commands, editors, scripts, permissions
Variables and input	Variables, quoting, input, substitution, arguments
Decisions	Exit status, tests, if, elif, else, case
Repetition	for, while, until, break, continue
Reusable scripts	Functions, parameters, local variables, return status
Structured data	Indexed and associative arrays
Linux automation	Files, logs, processes, services, backups, monitoring
Production practices	Validation, logging, traps, debugging, ShellCheck, testing
Capstone	Linux Operations Automation Toolkit

Git Workflow

git status
git add .
git commit -m "Add Bash scripting learning materials"
git push

Use small and meaningful commits for each learning day.

Repository

https://github.com/kcommit/shell-scripting

Author

Muhammad Khalid Khan
GitHub: kcommit

Purpose

The purpose of this repository is to build practical Bash scripting skills through consistent terminal practice, carefully sequenced assignments, and real Linux administration examples.

---

Start simple. Understand every line. Then automate with confidence.