Linux Guide

The Linux Guide is a 300-page technical e-book born from years of notes I have been taking — first in a Moleskine notebook, then digitally, and eventually refined into a structured and comprehensive document — throughout my experience studying, working with, and teaching Linux. In the words of Jedi Master Yoda: "Pass on what you have learned."

This guide is structured as a collection of Linux quick reference sheets. It covers over 1200 Linux commands and provides information on standards and system administration tools, as well as topics relevant to the certification exams LPIC-1 (Linux Professional Institute Certification Level 1), LPIC-2, RHCSA (Red Hat Certified System Administrator), RHCE (Red Hat Certified Engineer), and CEH (Certified Ethical Hacker).
This is an independent publication and is not affiliated with LPI, Red Hat, EC-Council, or any other organization.
You are welcome to share the Linux Guide, in part or in full, as long as it remains unmodified and is distributed free of charge.

You can download the guide from here (this is a permalink that always points to the latest edition). I release a new edition once a year, so stay tuned.

Latest edition: 13th ed., January 2025

Previous editions:
1st ed., May 2013
2nd ed., September 2014
3rd ed., July 2015
4th ed., June 2016
5th ed., September 2017
6th ed., August 2018
7th ed., May 2019
8th ed., January 2020
9th ed., January 2021
10th ed., March 2022
11th ed., March 2023
12th ed., March 2024