Text Processing · pro · solved in-browser (no VM needed) · 3 tiered hints
Write /home/player/transpose.sh: a bash script that transposes the comma-separated grid in /opt/data/grid.csv (rows become columns and columns become rows). Use awk: store every field into a two-dimensional array indexed by column and row number, track the maximum column count, then in an END block print each column's values across one line, comma-separated. Input and output are comma-separated. (Authored config, graded structurally — the engine isn't run here.)
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Open the challenge and an in-page editor appears — write your answer and tmpfs.tech grades it server-side against the same checks a real box would run. No VM, no install, no signup needed to try.
grep, sed, awk, cut and friends — extract and reshape text and logs.
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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.
How is it graded? Automatically and deterministically — your work is checked against the exact rules the live box would apply.