Command line references, interactive tutorials, wargames, and cheatsheets to become fluent at the terminal.
A complete Linux command reference with tutorials, man page explanations, and scriptable recipes. Also hosts the free "Linux Command Line" ebook.
Paste any shell command and this tool breaks it apart, explaining every flag, pipe, and redirect with the relevant man page entries.
Community-maintained simplified man pages. When you need to quickly see the most common usages of `find`, `awk`, or `grep`, TLDR is your friend.
Learn Linux through a gamified cybersecurity challenge. The Bandit wargame progression takes you from zero to comfortable on the command line.
Self-paced, free Linux learning with interactive exercises. Covers the command line, filesystem, processes, Bash scripting, and network utilities.
A comprehensive command reference for Windows CMD, PowerShell, Bash, macOS, and SQL. Bookmark it for when you need syntax without reading a man page.
A clean, to-the-point Bash scripting cheatsheet. Covers variables, conditionals, loops, functions, and string manipulation on a single page.
The most comprehensive guide to Bash shell scripting ever written. Covers patterns from simple scripts to complex system administration tasks.