tmpfs.tech · all tracks · Text Processing

List login users

Text Processing · easy · live throwaway Linux box · 3 tiered hints

Write every username (field 1 of /etc/passwd) sorted ascending, one per line, to /home/player/users.txt.

▶ Start this challenge

Fastest verified solves

• Tien201s · ✦ no hints

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.

More Text Processing challenges

grep, sed, awk, cut and friends — extract and reshape text and logs.

• Append a line to a logeasy
• Count distinct wordseasy
• Count the 403seasy
• Count the lineseasy
• Cut a column rangeeasy
• Extract unique emailseasy
• Join Lines With A Commaeasy · in-browser
• Last N lineseasy

See all Text Processing challenges →

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.