gzip


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Related to gzip: Gunzip, 7zip

gzip

(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.

gzip

(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 ?
Our factorization algorithm seems to compare satisfactorily with traditional compression, as embodied by gzip. The execution time overhead of introducing macros is between 2% and 30%.
Table II shows the entropy and compression ratios achieved for binary Huffman, plain Huffman, tagged Huffman, Gnu Gzip, and Unix Compress for the files of the TREC collection.
Traditional compression algorithms, e.g., gzip, are suboptimal for compressing relational datasets since they ignore the table structure and relationships between attributes.
(Note that ad resources are usually offered in the form of archives, such as ZIP or GZIP format, which may include a variety of compressed resources such as images, videos, HTML, and JavaScripts.)
The current partners--CAST Inc., Barco Silex, and Logic Fruit--provide the hardware libraries (IP blocks) needed to create these ready-to-use accelerators that are ideal for data centers, including GZIP Compression, GUNZIP decompression, and AES Encryption.
To obtain NCD, off-the-shelf compressors such as gzip and Snappy can be used.
Other "Office" formats, PDF, compression formats: supports other "Office" suite formats; compression formats like RAR, ZIP, GZIP and TAR; PDF, PDF Portfolio, and now many encrypted PDFs.
AHA Products Group said it has announced the introduction and immediate availability of two new GZIP compression accelerator products.
One may ask the following question: why not use a well known compression/decompression algorithm like gzip for example?
These innovative and high- performance modems combine DVB-S2, Adaptive Coding and Modulation (ACM), K4 GZIP lossless compression, redundancy and DoubleTalk Carrier-in-Carrier technologies and provide efficiencies and throughput that benefit even the most demanding point-to-point and backhaul links.