A task that needs to be performed on a regular basis is cleaning up the file system. For this purpose, you can use the rm command. For example, use rm /tmp/somefile to remove somefile from the /tmp directory. If you are root and have all the proper permissions on the file, you will succeed without any problems. (See Chapter 6 for more about permissions.) Since removing files can be delicate (imagine removing the wrong files), it may be necessary to push the rm command a little. You can do this by using the -f (force) switch. For example, use rm -f somefile if the command complains that somefile cannot be removed.
You can use the rm command to wipe entire directory structures as well; in this case, you have to use the -r option. If you combine this option with the -f option, the command will become very powerful. For example, use rm -rf /somedir to clear out the entire content of /somedir. You should be careful when using rm this way, especially since a small typing mistake can have serious consequences. Imagine, for example, that you type rm -rf / somedir (with a space between / and somedir) instead of rm -rf /somedir. As a result, the rm command will first remove everything in / and, once finished, will remove somedir as well. You should understand that the second part of the command is no longer required once the first part of the command has completed.
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