BZip2 is a famous compression format known especially on Posix systems, the bigger, more powerful brother of GZip. The 32-bit compile comes from the GnuWin32 project, and the 64-bit compile comes from HardwareHacks

bzip2, a block-sorting file compressor.  Version 1.0.4, 20-Dec-2006.
   usage: bzip2.exe [flags and input files in any order]
   -h --help           print this message
   -d --decompress     force decompression
   -z --compress       force compression
   -k --keep           keep (don't delete) input files
   -f --force          overwrite existing output files
   -t --test           test compressed file integrity
   -c --stdout         output to standard out
   -q --quiet          suppress noncritical error messages
   -v --verbose        be verbose (a 2nd -v gives more)
   -L --license        display software version & license
   -V --version        display software version & license
   -s --small          use less memory (at most 2500k)
   -1 .. -9            set block size to 100k .. 900k
   --fast              alias for -1
   --best              alias for -9
   If invoked as `bzip2', default action is to compress.
              as `bunzip2',  default action is to decompress.
              as `bzcat', default action is to decompress to stdout.
   If no file names are given, bzip2 compresses or decompresses
   from standard input to standard output.  You can combine
   short flags, so `-v -4' means the same as -v4 or -4v, &c.
Command 32-bit 64-bit Difference
Average -15.626%
bzip2 -1 149.729 128.794 -13.982%
bzip2 -5 156.859 130.962 -16.510%
bzip2 -9 166.552 139.262 -16.385%

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§4991 · March 6, 2010 · Tags: , , ·

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