| Tar File Format |
Article Index for Tar |
Information AboutTar File Format |
In command tar and were standardized by POSIX .1-1998 and later POSIX.1-2001. It is used to collate collections of files into one larger file, while preserving File System information such as user and group permissions, dates, and Directory structures.tar was originally developed for use with Sequential Access devices such as Tape Drive s, specifically for Backup purposes. However, it is now more frequently used as a general Archive utility. tar's linear roots can still be seen in its ability to work on any data stream and slow partial extraction performance, as it has to read through the whole archive to extract only the final file. Commonly a tar file is referred to as a ''tarball''.As is common with Unix utilities, tar is a single specialist program. It follows the Unix Philosophy in that it can ''"do only one thing"'' (archive), ''"but do it well"''. tar is most commonly used in tandem with an external compression utility such as Gzip , Bzip2 or, formerly, Compress , since it has no built in Data Compression facilities. These compression utilities generally only compress a single file, hence the pairing with tar, which can produce a single file from many files. To speed this, the BSD and GNU versions of tar supports the command line options -z (gzip), -j (bzip2), and -Z (compress), which will compress or decompress the archive file it is currently working with, although even in this case the (de)compression is still actually performed by an external program. Compression is sometimes avoided because of the greatly amplified potential for damage to data in long term storage.USAGE
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