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Join two CSVs on a key

Bash & Scripting · pro · live throwaway Linux box · 3 tiered hints

Write /home/player/join.sh A B. A has header `id,name`, B has header `id,score`. Print `id,name,score` (with that header) joining rows on id, sorted ascending by numeric id. Every id in A also appears in B.

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Nobody has solved this one yet — be the first clear on the leaderboard.

How it works

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.

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FAQ

Is it free? Yes — play as a guest, no signup required to start.

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.