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NoneGzip is a software application used for file compression and decompression. The program was created by Jean-Loup Gailly and Mark Adler as a free software replacement for the compress program used in early Unix systems, and intended for use by the GNU Project (the "g" is from "GNU")

gzip (GNU zip) is a compression utility designed to be a replacement for compress. Its main advantages over compress are much better compression and freedom from patented algorithms. It has been adopted by the GNU project and is now relatively popular on the Internet. gzip was written by Jean-loup Gailly (jloup@gzip.org), and Mark Adler for the decompression code. gzip produces files with a .gz extension. gunzip can decompress files created by gzip, compress or pack. The detection of the input format is automatic.

The format of the .gz files generated by gzip is described in RFCs (Request For Comments) 1951 and 1952. Some additional information on the gzip format is given here. A brief description of the compression and decompression algorithms used by gzip is given here. A more informal introduction written by Antaeus Feldspar is given here.

If you have a question about gzip, look first for an answer in this page. If you don't find it, write to support@gzip.org. Please give as much information as possible, at least the name of your operating system (Windows XP, Linux...), the exact command that you typed and the exact error messages that you get.