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$ tar czf myarch.tar.gz mydir
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Remember, a difference exists between compressing individual files in an archive and compressing the entire archive as a whole. Often, an archive is created for transferring several files at once as one tar file. To shorten transmission time, the archive should be as small as possible. You can use the compression utility gzip on the archive tar file to compress it, reducing its size, and then send the compressed version. The person receiving it can decompress it, restoring the tar file. Using gzip on a tar file often results in a file with the extension .tar.gz. The extension .gz is added to a compressed gzip file. The next example creates a compressed version of myarch.tar using the same name with the extension .gz:
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$ gzip myarch.tar $ ls $ myarch.tar.gz
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If you have a default device specified, such as a tape, and you want to create an archive on it, you can simply use tar without the f option and a device or filename. This can be helpful for making backups of your files. The name of the default device is held in a file called /etc/default/tar. The syntax for the tar command using the default tape device is shown in the following example. If a directory name is specified, all its subdirectories are included in the archive.
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$ tar option directory-and-file-names
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In the next example, the directory mydir and all its subdirectories are saved on a tape in the default tape device:
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$ tar c mydir
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In this example, the mydir directory and all its files and subdirectories are extracted from the default tape device and placed in the user's working directory:
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$ tar x mydir
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Note There are other archive programs you can use such as cpio and shar. However, tar is the one most commonly used for archiving application software.
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Midnight Commander (Gnome) and konqueror (KDE)
Both file managers in Gnome and the K Desktop have the capability to display the contents of a tar archive file automatically. The contents are displayed as though they were files in a directory. You can list the files as icons or with details, sorting them by name, type, or other fields. You can even display the contents of files. Clicking a text file opens it with a text editor, and an image is displayed with an image viewer. If the file manager cannot determine what program to use to display the file, it prompts you to select an application. Both file managers can perform the same kind operation on archives residing on remote file systems, such as tar archives on FTP sites. You can obtain a listing of their contents and even read their readme files. The Midnight Commander file manager (Gnome) can also extract an archive. Right-click the Archive icon and select Extract.
Desktop Archivers: guiTAR, gnochive, LnxZip, Ark, KArchive, and Xtar
Several desktop applications provide a GUI interface for creating and extracting archives. These archivers provide simple methods for managing archives, enabling you to select files and set options easily. The guiTAR archiver is Gnome-based. When creating an archive, you can choose from several compression methods, including tar, rar, and zip. You can open an archive with a drag-and-drop operation, dragging an archive file from the file manager window to the guiTAR window (see Figure 32-4). Files listed in an archive can be sorted by different fields by clicking the buttons across the top of the list. gnochive is a Gnome front end for Linux archive tools. LnxZip is another Gnome front end for Linux archive tools like zip, gzip, tar, arj, and bzip2. LnxZip has the added capability of generating RPM packages.
Figure 32-4: The guiTAR Gnome archiver Ark and KArchive are K Desktop archivers. With Ark, to open a new archive, you enter a name with the .tar.gz extension. Once an archive is open, you can add to it by dragging files from a file manager window to the Ark window. To extract an archive, first open it and then select Extract. KArchiver lets you create archives by simply dragging files to the KArchive icon. With KArchiver, you can also search for archives and convert between gzip and bzip2 versions. You can specify a root directory or create a tape profile listing specific files and directories. The Xtar archiver is an X Window System application that can run on any file manager and provides much the same functionality as the other archivers. Once you select the tar archive to open, all the files making up the tar archive are then listed in the main window. With Xtar, you have the option of either unpacking the entire tar archive or only a few files within it. Options also has a View item for displaying short text files, such as a readme file.
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