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Files and permissions

Seven lessons on how Linux keeps files: the folders every system has, finding things, reading rwxr-xr-x, changing it with chmod, owners, groups and sudo, links, and archives and disk space.

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How it works

Each lesson is a short read with real commands and what they show, then a few practice questions. Some have you type the command for a job, some have you pick an answer, and some have you tap steps into the right order. Typed commands are checked exactly as the shell would read them, capitals included, and most have more than one right way. You can try again as often as you like; after two misses there’s a button to show the answer.

What do I need to know first?

Command line basics, or knowing how to use cd, ls, cp and mv.

The other Linux courses

Where is my progress saved? In this browser, like the rest of the site. Nothing to sign up for.

Linux® is the registered trademark of Linus Torvalds in the U.S. and other countries. This course isn’t made by or affiliated with him or the Linux Foundation.