Bash & Scripting · medium · live throwaway Linux box · 3 tiered hints
Write /home/player/gcd.sh that prints gcd($1,$2).
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Press start and you get your own real, disposable Linux VM — in the browser terminal or over SSH. Work the task on a live system; tmpfs.tech grades your solution automatically against the actual machine state, then throws the box away. No install, free to try as a guest.
Write robust shell: loops, parsing, exit codes and small automation.
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Do I need to install anything? No. Everything runs in your browser, or connect over SSH if you prefer your own terminal.
How is it graded? Automatically and deterministically — your work is checked against the real state of the machine you worked on.