bzip2 is an open source data compression algorithm and program developed by Julian Seward. Seward made the first public release of bzip2, version 0.15, in July 1996. The compressor's stability and popularity grew over the next several years, and Seward released version 1.0 in late 2000. bzip2 compresses most files more effectively than more traditional gzip or ZIP (file format), but is slower. Nonetheless, with the constant effect of Moore's Law making computer time less and less important, compression methods like bzip2 have become more popular. Indeed, according to the author, bzip2 gets within ten to fifteen percent of the "best" class of compression algorithms currently known (PPM compression algorithm), although it is roughly twice as fast at compression and six times faster at decompression. bzip2 uses the Burrows-Wheeler transform to convert frequently recurring character sequences into strings of identical letters. In bzip2 the blocks are all the same size in plaintext, which can be selected by a command-line argument, and are marked in compresstext by bit-sequences derived from the decimal representation of pi. Originally, bzip2's ancestor bzip used arithmetic coding after the blocksort; this was discontinued because of the patent restriction. In GNU, bzip2 can be used combined or independently of tar (file format): ''bzip2 file'' to compress and ''bzip2 -d file.bz2'' to uncompress (the alias ''bunzip2'' for decompression may also be used). bzip2's command line flags are mostly the same as in gzip. So, to extract from a bzip2-compressed tar-file you can do this: bzip2 -cd ''archivefile''.tar.bz2 | tar xvf - To create a bzip2-compressed tar-file you can do this: tar cvf - filenames | bzip2 -9 > ''archivefile''.tar.bz2 GNU tar supports a -j flag, which allows you to make tar.bz2 in one go (this is likely the most common form in which you will find bzip2 files): tar -cvjf ''archivefile''.tar.bz2 ''file-list'' Decompressing in GNU tar is easy enough: tar -xvjf ''archivefile''.tar.bz2 ==See also== *List of archive formats *List of file archivers *Comparison of file archivers ==External links== *[http://ftp.uni-paderborn.de/aminetbin/find?bzip2 Aminet: Search results for "bzip2"] (or Bzip2 for Amiga) *[http://www.bzip.org/ The bzip2 and libbzip2 home page] *[http://gnuwin32.sourceforge.net/packages/bzip2.htm bzip2 for Windows] *[http://hobbes.nmsu.edu/cgi-bin/h-search?key=bzip2&pushbutton=Search Hobbes: Search results for: bzip2] (or Bzip2 for OS/2) *[http://persephone.cps.unizar.es/~spd/bzip2/ MacBzip2] (for Classic Mac OS. Under Mac OS X, bzip2 is directly available at the command line in a "terminal" window) Lossless compression algorithms Data compression software Free software
There was also briefly some content at bunzip2: ''bzip2 and bunzip2 are free open-source compression utilities.'' :They're a single utility with different behavior depending on the name used to call it, actually. :) ''Many consider them "third-generation" compression utilities, surpassing both first-generation tools (like arc and LHA) and second-generation tools (such as the popular PKZIP and gzip formats) in compression ability; it "pays" for this extra compression with an increased computational cost. Nonetheless, with the constant effect of Moore's Law making computer time less and less important, compression methods like bzip2 have become more popular.'' ''Of particular note is the fact that, unlike PKZIP, bzip2 is released under a very permissive license, which encourages its use in both open source- and closed-source software.'' :Note that in addition to bzip2, gzip and zlib, there's the PKZIP-compatible [http://www.info-zip.org/pub/infozip/ Info-ZIP], also under a permissive license. --User:Brion VIBBER 04:41 23 Jun 2003 (UTC) ::Indeed. I was referring specifically to the PKZIP product, which doesn't have a permissive license. With the move to bzip2, however, and the new article, I don't see much need for my third-generation rambles and jabber about PKZIP's license. The addition of the Moore's Law comment is good enough for me; I was just trying to destubify an article I knew a bit about (bunzip2), but there's no need for that here. User:Phil Bordelon 04:47 23 Jun 2003 (UTC) :::Do feel free to expand on this one, it's still a bit short. :) --User:Brion VIBBER 04:49 23 Jun 2003 (UTC) == π? == ''bit-sequences derived from the decimal representation of pi.'' :Eh? Why? -- Anon. ::Indeed, this caught my eye too and is nonsense. -S
See other meanings of words starting from letter:
Words begining with Bzip2:
Bzip2
Bzip2
Bzip2_(algorithm)
Bzip2_(algorithm)
Bzip2
bzip2 is an open source data compression algorithm and program developed by Julian Seward. Seward made the first public release of bzip2, version 0.15, in July 1996. The compressor's stability and popularity grew over the next several years, and Seward released version 1.0 in late 2000. bzip2 compresses most files more effectively than more traditional gzip or ZIP (file format), but is slower. Nonetheless, with the constant effect of Moore's Law making computer time less and less important, compression methods like bzip2 have become more popular. Indeed, according to the author, bzip2 gets within ten to fifteen percent of the "best" class of compression algorithms currently known (PPM compression algorithm), although it is roughly twice as fast at compression and six times faster at decompression. bzip2 uses the Burrows-Wheeler transform to convert frequently recurring character sequences into strings of identical letters. In bzip2 the blocks are all the same size in plaintext, which can be selected by a command-line argument, and are marked in compresstext by bit-sequences derived from the decimal representation of pi. Originally, bzip2's ancestor bzip used arithmetic coding after the blocksort; this was discontinued because of the patent restriction. In GNU, bzip2 can be used combined or independently of tar (file format): ''bzip2 file'' to compress and ''bzip2 -d file.bz2'' to uncompress (the alias ''bunzip2'' for decompression may also be used). bzip2's command line flags are mostly the same as in gzip. So, to extract from a bzip2-compressed tar-file you can do this: bzip2 -cd ''archivefile''.tar.bz2 | tar xvf - To create a bzip2-compressed tar-file you can do this: tar cvf - filenames | bzip2 -9 > ''archivefile''.tar.bz2 GNU tar supports a -j flag, which allows you to make tar.bz2 in one go (this is likely the most common form in which you will find bzip2 files): tar -cvjf ''archivefile''.tar.bz2 ''file-list'' Decompressing in GNU tar is easy enough: tar -xvjf ''archivefile''.tar.bz2 ==See also== *List of archive formats *List of file archivers *Comparison of file archivers ==External links== *[http://ftp.uni-paderborn.de/aminetbin/find?bzip2 Aminet: Search results for "bzip2"] (or Bzip2 for Amiga) *[http://www.bzip.org/ The bzip2 and libbzip2 home page] *[http://gnuwin32.sourceforge.net/packages/bzip2.htm bzip2 for Windows] *[http://hobbes.nmsu.edu/cgi-bin/h-search?key=bzip2&pushbutton=Search Hobbes: Search results for: bzip2] (or Bzip2 for OS/2) *[http://persephone.cps.unizar.es/~spd/bzip2/ MacBzip2] (for Classic Mac OS. Under Mac OS X, bzip2 is directly available at the command line in a "terminal" window) Lossless compression algorithms Data compression software Free software
Bzip2
There was also briefly some content at bunzip2: ''bzip2 and bunzip2 are free open-source compression utilities.'' :They're a single utility with different behavior depending on the name used to call it, actually. :) ''Many consider them "third-generation" compression utilities, surpassing both first-generation tools (like arc and LHA) and second-generation tools (such as the popular PKZIP and gzip formats) in compression ability; it "pays" for this extra compression with an increased computational cost. Nonetheless, with the constant effect of Moore's Law making computer time less and less important, compression methods like bzip2 have become more popular.'' ''Of particular note is the fact that, unlike PKZIP, bzip2 is released under a very permissive license, which encourages its use in both open source- and closed-source software.'' :Note that in addition to bzip2, gzip and zlib, there's the PKZIP-compatible [http://www.info-zip.org/pub/infozip/ Info-ZIP], also under a permissive license. --User:Brion VIBBER 04:41 23 Jun 2003 (UTC) ::Indeed. I was referring specifically to the PKZIP product, which doesn't have a permissive license. With the move to bzip2, however, and the new article, I don't see much need for my third-generation rambles and jabber about PKZIP's license. The addition of the Moore's Law comment is good enough for me; I was just trying to destubify an article I knew a bit about (bunzip2), but there's no need for that here. User:Phil Bordelon 04:47 23 Jun 2003 (UTC) :::Do feel free to expand on this one, it's still a bit short. :) --User:Brion VIBBER 04:49 23 Jun 2003 (UTC) == π? == ''bit-sequences derived from the decimal representation of pi.'' :Eh? Why? -- Anon. ::Indeed, this caught my eye too and is nonsense. -S
See other meanings of words starting from letter:
B
BA | BC | BD | BE | BF | BG | BH | BI | BJ | BK | BL | BM | BN | BO | BP | BR | BS | BT | BU | BW | BX | BY | BZ |Words begining with Bzip2:
Bzip2
Bzip2
Bzip2_(algorithm)
Bzip2_(algorithm)
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