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Cleaning up the file system is another task that needs to be performed regularly, and for this you ll use the rm command. For example, rm /tmp/somefile removes somefile from the /tmp directory. If you are root or if you have all the proper permissions on the file, you will succeed without any problem. (See 5 for more on permissions.) Removing files can be a delicate operation (imagine removing the wrong files), so it may be necessary to push the rm command a little to convince it that it really has to remove everything. You can do this by using the -f (force) switch (but only if you really are quite sure). For example, use rm -f somefile if the command complains that somefile cannot be removed for some reason. Conversely, to stay on the safe side, you can also use the -i option to rm, which makes the command interactive. When using this option, rm will ask for every file that it is about to remove if you really want to remove it. The rm command can be used to wipe entire directory structures as well; in this case the -r option has to be used. If this option is combined with the -f option, the command will become very powerful and even dangerous. For example, use rm -rf /somedir to clear out the entire content of /somedir, including the directory /somedir itself. Obviously, you should be very careful when using rm this way, especially because 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. The rm command will first remove everything in / and, when it is finished with that, it will remove somedir as well. Hopefully you 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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CHAPTER 2 GETTING THE MOST OUT OF THE COMMAND LINE
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Caution Be very careful using potentially destructive commands like rm. There is no good undelete
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mechanism for the Linux command line, and, if you ask Linux to do something, it doesn't ask whether you are sure (unless you use the -i option).
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If you need to copy files from one location in the file system to another, use the cp command. This command is straightforward and easy to use; for example, use cp ~/* /tmp to copy all files from your home directory to the /tmp directory. As you can see, in this example I introduced a new item: the tilde (~). The shell interprets that as a way to refer to the current user s home directory. If subdirectories and their contents need to be included in the copy command as well, use the option -r. You should, however, be aware that cp normally does not copy hidden files. If you need to copy hidden files as well, make sure to use a pattern that starts with a dot; for example, use cp ~/.* /tmp to copy all files whose names start with a dot from your home directory to the /tmp directory.
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As an alternative to copying files, you can move them. This means that the file is removed from its source location and placed in the target location, so you end up with just one copy instead of two. For example, use mv ~/somefile /tmp/otherfile to move the somefile file to /tmp. If a subdirectory with the name otherfile already exists in the /tmp directory, somefile will be created in this subdirectory. If /tmp has no directory with this name, the command will save the contents of the original somefile under its new name otherfile in the /tmp directory. The mv command also does more than just move files. You can use it to rename files or directories, as well, and regardless of whether there are any files in those directories. If, for example, you need to rename the directory /somedir to /somethingelse, use mv /somedir /somethingelse.
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