Textbook of Linux

63 lessons. Real terminal challenges. Quizzes that test what each animation teaches. The fastest way to actually learn Linux.

Master Linux from your phone. Textbook of Linux teaches you the command line through interactive terminal demos, hands-on command challenges, and adaptive practice.

WATCH -Terminal walkthroughs show you exactly how each command works, with output appearing step by step.

TYPE - Terminal Challenges let you type real Linux commands on a custom keyboard. The app validates your input, accepts flag reordering (ls -lah = ls -alh), and gives partial credit when you get the command right but miss a flag.

PRACTISE - 760 multiple-choice questions across 76 topics test your understanding. The adaptive engine tracks what you know and focuses on your weak areas.

FOUR DOMAINS • Command Line (FREE) - shell basics, files, pipes, grep, sed, awk, find • System Administration - users, permissions, processes, packages, networking, systemd • Programming & Tools - shell scripting, vi, git • Modern Linux - containers, Docker, security, performance, eBPF

GAMIFICATION • XP and levels (Newbie → Root) • Daily streaks with streak freezes • 20 achievements across streak, mastery, speed, and volume categories • Spaced repetition for long-term retention

FREE TO START The entire Command Line domain (16 topics, 160 questions, 16 terminal challenges) is free. Subscribe to unlock all 4 domains.

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