Specifications
| Format | Learning |
|---|---|
| Level | Beginner, Intermediate |
| Price | Free |
| Access | No registration |
| Activity | Active |
| Language | EN |
| Category | Systems |
Tasks solved through the command line, where the statement describes a result and leaves the tools to you. Every task is checked automatically, with solutions and a leaderboard alongside. The basic levels need no registration, and no task counter is published.
Pros & cons
Pros
- Automatic checking, so the verdict arrives while you are at the prompt
- Solutions and a leaderboard to compare your attempt against
- The basic levels need no registration at all
Cons
- The statements are terse on purpose, and one stray word changes the task
- Command line only: nothing here is about vulnerabilities
- Some checks accept an answer without confirming it was produced the intended way
Who it fits
Suits someone who knows what a command line is but has never solved a task with one. The format punishes guessing a command and rewards reading the statement twice.
Getting started
- Start with the ls, grep and sorting tasks, they check that you read output
- Read each statement to its last word before typing anything at all
- Open the writeup only after a second failed attempt, not after the first
History
Running for years as a small project that still gets new tasks and a maintained leaderboard. The basic levels have stayed open without an account, and the site publishes no task counter, so the size of the set is not something you can read off the page. Checked.
