Awesome Linux

A structured, practical Linux course. It starts at the command line and shell scripting, then moves on to the skills behind modern DevOps.

This repository is a complete Linux reference, built phase by phase around real terminal practice. It begins with the filesystem and core commands, then covers streams, regular expressions, and text processing. After that it moves into Bash scripting and automation, and it ends with the skills used on production systems: process and service management, networking, storage, logging, and security.

Every phase stands on its own, with written documentation and a lab folder that holds runnable practice files and exercises. The material matches what DevOps and cloud engineering work asks for, because Linux skill is the base that containers, CI/CD, and infrastructure as code are built on.

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Safety Note

Some labs, such as permissions, users, storage, and security hardening, change system settings. A wrong command can lock you out or damage files.

• Run these labs in a VM, a container, or a fresh WSL2 install, never on your main machine.
• Read each script before you run it.
• Take a snapshot of your VM before the storage and security phases.

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Setup

Tool	Check	Used for
WSL2 + Ubuntu (or any Linux VM or Docker)	lsb_release -a	Lab environment
Bash 5 or newer	bash --version	Running scripts
GNU coreutils, grep, sed, gawk	gawk --version	Text processing phases
ShellCheck	shellcheck --version	Checking scripts for mistakes
Git	git --version	Cloning the repo

Get the repo:

git clone https://github.com/akshayredekar07/linux.git
cd linux

Windows users: open PowerShell as Administrator and run wsl --install -d Ubuntu, then restart your computer and open the Ubuntu app.

Install the tools on Ubuntu:

sudo apt update
sudo apt install -y git gawk shellcheck

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Roadmap Overview

Phase	Folder	Focus
1	01__fundamentals/	Components, hierarchy, file types
2	02__navigation/	Paths, ls, directories
3	03__file-operations/	Create, copy, move, symlinks
4	04__viewing-comparing/	cat, less, diff
5	05__text-processing/	wc, sort, paste, tr
6	06__streams-pipes/	Redirection, pipes, tee, xargs
7	07__find-locate/	locate, find
8	08__regex-grep/	Regular expressions, grep
9	09__permissions/	Permissions, umask, sudo
10	10__editors/	vi and vim
11	11__shell-basics/	Scripts, variables, arguments, .bashrc, aliases, PATH, environment variables, dotfiles
12	12__control-flow/	Tests, case, loops
13	13__arrays-functions/	Arrays, functions
14	14__sed-awk/	sed, awk, jq for JSON, YAML basics
15	15__advanced-scripting/	trap, getopts, strict mode
16	16__users-groups/	Users and groups
17	17__processes-services/	Processes, job control (bg, fg, nohup), signals, boot process, systemd, cron
18	18__networking-ssh/	Networking, SSH, curl, firewalls (ufw, nftables), time sync
19	19__storage-packages/	Disks, filesystems, mounting, LVM, packages, archives, backups with rsync and tar
20	20__logging-monitoring/	Logs, performance tools
21	21__security-hardening/	SSH hardening, firewall rules, SELinux
22	22__devops-toolchain/	Containers, cloud, Git, Ansible, make and Makefiles
23	23__projects/	Full shell projects
24	24__resources/	Cheat sheets, references

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Phase 22 and 23 Details

Phase 22: DevOps toolchain

• Containers with Docker: images, containers, volumes, networks
• Cloud basics: virtual machines, SSH access, simple deployments
• Git for daily work: branches, merges, tags
• Ansible: inventories, playbooks, simple roles
• make and Makefiles for repeatable tasks

Phase 23: Projects

• Backup script with rsync and rotation
• Log analyzer that counts errors and builds a report
• System health checker for CPU, memory, and disk
• User onboarding script that creates users and sets permissions
• Service watcher that restarts a failed service and sends an alert

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Repo Structure

awesome-linux/
├── README.md
├── LICENSE
├── .gitignore
├── .github/workflows/shellcheck.yml
├── scaffold.sh
├── 01__fundamentals/ ... 24__resources/
│   ├── README.md          # phase overview
│   ├── documentation/     # written lessons
│   └── lab/               # runnable scripts, sample data, and exercises
│       ├── scripts/       # practice scripts
│       ├── data/          # sample files used by the scripts
│       └── exercises.md   # practice questions with answers
└── assets/
    ├── images/
    └── diagrams/

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Contributing

Fixes and new examples are welcome.

1. Fork the repo and create a branch.
2. Keep each phase in the same layout: documentation/ and lab/.
3. Run shellcheck on every script before you open a pull request.
4. Open a pull request with a short note on what you changed.

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License

This project uses the license in the LICENSE file.

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Built by @akshayredekar07 with ❤️