Write it. Run it. Keep it.
A free account saves what you write, so you can pick it up on any device.
Free to use, nothing to sign up for
Online code editor
Practise cd, mkdir, cat, tail, touch and the other everyday commands in a real terminal, running a real, minimal Alpine Linux.
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Teaching a class? The same editor, with tests, hand-ins and marking, is the Learning Platform, free to try.
How it works, in the manual: Running a class with nothing installed.