Text Processing · medium · solved in-browser (no VM needed) · 3 tiered hints
Write /home/player/cumsum.sh: a bash script that reads /opt/data/sales.csv (a header line, then rows of day,amount). Using awk with comma as the field separator, skip the header and print two comma-separated columns per remaining row: the day and a running (cumulative) total of the amount column so far. Set the output field separator (OFS) to a comma. (Authored config, graded structurally — the engine isn't run here.)
▶ Start this challengeNobody has solved this one yet — be the first clear on the leaderboard.
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.
See all Text Processing challenges →
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.