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gzip    
{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}.


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  • What is the maximum compression ratio of gzip? - Super User
    It very much depends on the data being compressed A quick test with a 1Gb file full of zeros using a standard version of gzip (with default options or specifying -9) gives a compressed size of ~1018Kb, so your 10Kb file could potentially expand into ~10Mbytes
  • How to password protect gzip files on the command line?
    Using gzip and aespipe $ cat clear_text | gzip | aespipe > clear_text gz aes #Compress Encrypt $ cat clear_text gz aes | aespipe -d | gunzip > clear_text #Decrypt Decompress aespipe is what it sounds like, a program that takes input on stdin and outputs aes encrypted data on stdout
  • How to gzip multiple files into one gz file? - Super User
    Quoth the gzip manpage: If you wish to create a single archive file with multiple members so that members can later be extracted independently, use an archiver such as tar or zip GNU tar supports the -z option to invoke gzip transparently gzip is designed as a complement to tar, not as a replacement
  • Between xz, gzip, and bzip2, which compression algorithim is the most . . .
    The fastest algorithm are by far lzop and lz4 which can produce a compression level not very far from gzip in 1 3 seconds while gzip took 8 1 second The compression ratio is 2 8 for lz4 and 3 7 for gzip Here are a few results I extracted from this article : Gzip : 8 1s @ 3 7 lz4 : 1 3s @ 2 8 xz : 32 2s @ 5 43 xz -e : 6m40 @ 7 063 xz
  • compression - Does anyone know of any version of Gzip which supports 64 . . .
    when I use GZIP in 64-bit Windows, I receive this message: the program "GZIP exe" cannot start or run due to incompatibility with 64-bit versions of windows
  • Md5 checksum different after gunzip and gzip - Super User
    This actually isn't necessarily true If you gzip a file (on disk), checksum it, gunzip it, gzip it again, and checksum it again, you'll get matching checksums (or at least, I do) The timestamp is of the original file If the original "file" wasn't on disk, then it'll be the current time –
  • tar error message: stdin: not in gzip format - Super User
    The -o option of wget specifies where to put the log file You'll find that your dropbox tar gz is a plain text file containing diagnostic messages from wget
  • unix - How can I get the uncompressed size of gzip file without . . .
    I've tried the following command to get size of a file in gzip archive: $ gzip -l mycontent DAT Gz compressed uncompr ratio uncompressed_name -1223644243 1751372002 -75 3% mycontent DAT Gz Not sure how to interpret the unzipped size from this Compressed file size close to 4 GB So, I tried this option in order to capture correct data:





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