The Terminal — Free Quiz Course

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Test your command line knowledge: navigating the filesystem, working with files, permissions, pipes and redirection, and processes.

5 chapters, 50 questions. Free, no signup. Progress is saved in your browser.

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  1. Chapter 1: Navigation Basics
    The shell, moving around with cd and pwd, listing files with ls, absolute vs relative paths, and getting help with man.
  2. Chapter 2: Working with Files
    Creating, copying, moving and deleting files and folders, viewing file contents with cat, less, and tail, and finding files.
  3. Chapter 3: Permissions & Users
    Reading rwx permission strings, chmod numeric and symbolic modes, chown, sudo, and why permission denied happens.
  4. Chapter 4: Pipes, Redirection & Text
    stdin, stdout and stderr, redirecting output with > and >>, chaining commands with pipes, and processing text with grep, sort, and uniq.
  5. Chapter 5: Processes & Jobs
    Listing processes with ps and top, killing processes, background jobs with & and bg/fg, nohup, and finding what uses a port.

Course completed

You finished every chapter — best score/.

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How it works

Each chapter is a short quiz: one question at a time, with immediate feedback and an explanation after every answer. Wrong answers teach you as much as right ones.

Your progress is stored in your browser (localStorage), so you can leave and come back any time. Nothing leaves your machine, and there is no account or signup.

The questions are based on tutorials published on this site — every chapter links the related posts, and you can grab the free CLI Handbook to study the whole topic.