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To decompress, use the bunzip2 command on a bzip file.
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Zip is a compression and archive utility modeled on PKZIP, which was used originally on DOS systems. Zip is a cross-platform utility used on Windows, Mac, MSDOS, OS/2, Unix, and Linux systems. Zip commands can work with archives created by PKZIP and PKZIP programs and can use Zip archives. You compress a file using the zip command. This creates a Zip file with the .zip extension. If no files are listed, zip outputs the compressed data to the standard output. You can also use the - argument to have zip read from the standard input. To compress a directory, you include the -r option. The first example archives and compresses a file:
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The next example archives and compresses the reports directory:
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A full set of archive operations is supported. With the -f option, you can update a particular file in the zip archive with a newer version. The -u option replaces or adds files, and the -d option deletes files from the zip archive. Options also exist for encrypting files and DOS-toUnix end-of-line translations, and including hidden files. To decompress and extract the Zip file, you use the unzip command.
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With release 7.2, Red Hat introduced journaling capabilities with the ext3 file system. Journaling provides for fast and effective recovery in case of disk crashes, instead of using fsck or e2fsck. With journaling a log is kept of all file system actions. These are placed in a journal file. In the event of a crash, Linux only needs to read the journal file to restore the system to its previous state. Files that were in the process of writing to the disk, can be restored to their original state. Journaling also avoids lengthy fsck checks on reboot that occur
when your system suddenly looses power or if it freezes and has to be restarted physically. Your system just reads its journal files to restore the file system, instead of manually checking each file and directory with fsck. Journaling is implemented automatically with ext3. The ext3 file system is also fully compatible with the earlier ext2 version it replaces. To create an ext3 file system you use the mk2fs command with the j option. You can even upgrade ext2 file systems to ext3 versions automatically, with no loss of data or change in partitions. This upgrade just adds a journal file to an ext2 file system and enables journaling on it, using the tune2fs command. Be sure to change the ext2 file type to ext3 in any corresponding /etc/fstab entries. The following example converts the ext2 file system on /dev/hda3 to an ext3 file system by adding a journal file (-j).
tune2fs j /dev/hda3
The ext3 filesystem has three journalling modes of operation: ordered, journal, and writeback. The ordered mode is the default, guaranteeing the integrity of files written recently. The writeback mode works faster, but performs less logging and may result in corrupt data in the case of crash. The journal mode is the slowest, but copies all data to the journal, allowing for complete recovery. You set the mode with the data option in either the mount command or fstab entry, as in data=journal. There are other kind of journaling file systems you can use on Linux. These include ReiserFS, JFS, and XFS. ReiserFS is named after Hans Reiser and provides a completely reworked file system structure based on journaling (www.reiserfs.org). JFS is the IBM version of a journaling file system, designed for use on servers providing high throughput such as ebusiness enterprise servers (oss.software.ibm.com/ developerworks/opensource/jfs/). It is free distributed under the GNU public license. XFS is another high performance journaling system developed by Silicon Graphics (oss.sgi.com/projects/xfs/). XFS is compatible with RAID and NFS file systems. Though journaling is often used to recover from disk crashes, a journal-based file system can do much more. The ext3, JFS, and XFS file systems only provide the logging operations used in recovery, whereas ReiserFS uses journaling techniques to completely rework file system operations. In ReiserFS journaling is used to read and write data, abandoning the block structure used in traditional Unix and Linux systems. This gives it the capability to access a large number of small files very quickly, as well as use only the amount of disk space they would need. However, efficiency is not that much better with larger files.
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