In this lesson you practise the Linux command line with exercises you do in a terminal that runs in your browser. You move between folders, create, copy, move and delete files, read and search a log file, and join commands with pipes, and a file tree beside the terminal shows what every command changed.

Watch five commands run, then type your own:

In this lesson you'll:

• find out where you are and what is around you (pwd, ls, cd)
• make, copy, move, rename and delete files and folders
• read and search files (cat, head, tail, wc, grep)
• join commands into one with |, and save the result with >

It takes about an hour. Each step has a terminal with a short list of tasks; they tick themselves when the files look right. Nothing you type can harm a real computer: the files are pretend, and Start again puts them back.

Takeaway: a command is a word, then options and names, then Enter.