Linux commands

Linux is the operating system of cybersecurity. Most penetration testing tools, servers, CTF machines and security distributions like Kali Linux run on it, so comfort with the command line is the first skill every ethical hacker and SOC analyst needs. Knowing how to move around the file system, manage permissions, inspect processes, analyze logs and work with the network from the terminal makes every lab and real-world task faster.

This collection brings together Cracking Station’s Linux content: the complete Linux Command Cheat Sheet (2026), the Advent of Cyber Linux CLI walkthrough, connecting to TryHackMe with OpenVPN on Linux, and VPN setup for Kali Linux. Each guide shows real commands with examples you can practice in your own lab.

Written by a certified CEH and CEI instructor for beginners and certification candidates. Watch the video walkthroughs on the Mr. Professor YouTube channel.