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$ mv *.c newproj
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If you want to move all the files in a given directory to another directory, you can use * to match on and generate a list of all those files. In the next example, the user moves all the files in the reports directory to the repbks directory:
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$ mv reports/* repbks
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Moving and Copying Directories
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You can also copy or move whole directories at once. Both cp and mv can take as their first argument a directory name, enabling you to copy or move subdirectories from one directory into another (see Table 12-6). The first argument is the name of the directory to be moved or copied, while the second argument is the name of the directory within which it is to be placed. The same pathname structure used for files applies to moving or copying directories. You can just as easily copy subdirectories from one directory to another. To copy a directory, the cp command requires you to use the -r option. The -r option stands for "recursive." It directs the cp command to copy a directory, as well as any subdirectories it may contain. In other words, the entire directory subtree, from that directory on, will be copied. In the next example, the thankyou directory is copied to the oldletters directory. Now two thankyou subdirectories exist, one in letters and one in oldletters.
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$ cp -r letters/thankyou oldletters $ ls -F letters /thankyou $ ls -F oldletters /thankyou
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As you use Linux, you will find the number of files you use increases rapidly. Generating files in Linux is easy. Applications such as editors, and commands such as cp, easily create files. Eventually, many of these files may become outdated and useless. You can then remove them with the rm command. In the next example, the user erases the file oldprop:
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$ rm oldprop
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The rm command can take any number of arguments, enabling you to list several filenames and erase them all at the same time. You just list them on the command line after you type rm.
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$ rm proposal version1 version2
Be careful when using the rm command, because it is irrevocable. Once a file is removed, it cannot be restored (there is no undo). Suppose, for example, you enter the rm command by accident while meaning to enter some other command, such as cp or mv. By the time you press ENTER and realize your mistake, it is too late. The files are gone. To protect against this kind of situation, you can use the rm command's -i option to confirm you want to erase a file. With the -i option, you are prompted separately for each file and asked whether to remove it. If you enter y, the file will be removed. If you enter anything else, the file is not removed. In the next example, the rm command is instructed to erase the files proposal and oldprop. The rm command then asks for confirmation for each file. The user decides to remove oldprop, but not proposal.
$ rm -i proposal oldprop Remove proposal n Remove oldprop y $
To remove a directory and all its subdirectories you use the rm command with the -r option. This is a very powerful command and could easily be used to erase all your files. The following example deletes the reports directory and all its subdirectories:
rm -r reports
Be careful of using the asterisk matching character, as described in 11. The following command will erase every file in your current working directory.
rm *
Note This is a very powerful operation, capable of erasing large segments of your file systems. Use with caution.
Links: the ln Command
You can give a file more than one name using the ln command. You might want to reference a file using different filenames to access it from different directories. The added names are often referred to as links.
The ln command takes two arguments: the name of the original file and the new, added filename. The ls operation lists both filenames, but only one physical file will exist.
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