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(tool, compression)
GNU compression utility. Gzip reduces the size of the named files using Lempel-Ziv LZ77 compression. Whenever possible, each file is replaced by one with the filename extension ".gz". Compressed files can be restored to their original form using gzip -d or gunzip or zcat.

The Unix "compress" utility is patented (by two separate patents, in fact) and is thus shunned by the GNU Project since it is not free software. They have therefore chosen gzip, which is free of any known software patents and which tends to compress better anyway. All compressed files in the GNU anonymous FTP area (gnu.org/pub/gnu) are in gzip format and their names end in ".gz" (as opposed to "compress"-compressed files, which end in ".Z").

Gzip can uncompress "compress"-compressed files and "pack" files (which end in ".z"). The decompression algorithms are not patented, only compression is.

The gzip program is available from any GNU archive site in shar, tar, or gzipped tar format (for those who already have a prior version of gzip and want faster data transmission). It works on virtually every Unix system, MS-DOS, OS/2 and VMS.


(GNU ZIP) A popular compression program in the Unix world that is also available for Windows and Mac. Using the .GZ file extension, gzip compresses only a single file and is therefore often used in combination with the Unix "tar" utility when more than one file must be compressed. Tar combines multiple files into one archive, and gzip compresses that single archive, creating a file with the extension .TAR.GZ.

"Gunzip" is the gzip decompression utility, and it decompresses archives compressed with gzip or the Unix pack and compress commands. Many have lamented the fact that gzip includes the word "zip" because gzip cannot decompress files compressed with PKZIP. It was named that way because gzip uses one of the algorithms in PKZIP. However, in contrast, many PKZIP utilities can decompress gzip files. For more information, visit www.gzip.org. See archive formats.
References in periodicals archive ?
PLDA GROUP and CAST have unveiled the results of a tight collaboration to make FPGA-accelerated GZIP compression accessible to developers of data center applications.
AHA Products Group has deployed two new GZIP Compression Accelerator products.
AHA Products Group said it has announced the introduction and immediate availability of two new GZIP compression accelerator products.
HTML is usually used in combination with gzip compression, but gzip is a general-purpose compression algorithm and much better results can be achieved with a compression algorithm specialized for dealing with HTML documents.
Google says gzip compression works well on the Web because HTML and Cascading Style Sheets files usually contain plenty of repeated strings.
WebRider takes over such functions as SSL encryption, GZIP compression and TCP connection management.
The devices will deliver ActiveX applets to extranet desktops, which will proxy for TCP traffic and compress it using a variation of the Gzip compression method.
It also provides Z, TAR, Zip, and Gzip compression as well a Binhex, MacBinary, MIME, and uuencode encoding.
com), an innovative developer of advanced FPGA embedded system solutions, CebaFlex(TM) rapidly tunable silicon intellectual property (IP) cores with new, multi-stream versions of its GZIP compression and GUNZIP decompression IP targeted specifically at data networking applications.