03step · do it for real
A real terminal. A real hidden flag. Your turn.
You've seen how it works. Now start up your own private Linux machine and find the flag with your own hands. The flashcards on the right are for warming up; the quiz checks that you remember the moves.
Sandbox · ready to launch
Spawn linux-terminal-basics
You'll get your own private Linux machine (Ubuntu 24.04) with a terminal right in your browser. The flag is hidden somewhere on it. Use the commands you just learned — ls, cd, find, grep, cat. The session closes itself after 60 minutes of sitting idle.
1Look around the files, starting from /home/student
2Find the hidden flag file — by its name or by what's inside it
3Read it with cat and submit the flag text
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Warm-up · 20 flashcards & 10 questions
Question
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Answer
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