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Just be careful with that command, as one little slip can destroy everything if you're doing it as root. The options given to rm tell it to delete all files and directories within directories recursively and force deletion even when you'd normally get a warning. If you type the wrong thing to delete, your system can easily be gone.
Note that -r = recursive and -f = force(!), which may be required, depending on the file ownerships/perms at the time.
As warned above, a relatively simple typo can remove more than you want or even the entire system.... It has really been happened to people.
Try not to use root when doing that, it should only be required if the files are owned by root.