NAME

       lz4 - Tool using Fast LZ compression algorithm library

SYNOPSIS

       lz4 [arg] [input] [output]

DESCRIPTION

       LZ4  is a very fast lossless compression algorithm.  This uses Dictionary compression, and
       only supports compression and decompression unit blocks.

       Infomation about compression ratio and speed (from webpage of lz4): single thread, Core  2
       Duo @3GHz, using the Open-Source Benchmark program by m^2 compiled with GCC v4.5.2, on the
       Silesia Corpus.

       Name            Ratio   C.speed D.speed
       LZ4 (r59)       2.084   330      915
       LZO 2.05 1x_1   2.038   311      480
       QuickLZ 1.5 -1  2.233   257      277
       Snappy 1.0.5    2.024   227      729
       LZF             2.076   197      465
       FastLZ          2.030   190      420
       zlib 1.2.5 -1   2.728    39      195
       LZ4 HC (r66)    2.712    18     1020
       zlib 1.2.5 -6   3.095    14      210

OPTIONS:

       input a filename with no FILE, or when FILE is - or stdin, read standard input

       -1     Fast compression (default)

       -9     High compression

       -d     decompression (default for .lz4 extension)

       -z     force compression

       -f     overwrite output without prompting

       -h/-H  display help/long help and exit

AUTHOR

       This manual page was written by Nobuhiro Iwamatsu  <iwamatsu@debian.org>  for  the  Debian
       GNU/Linux system (but may be used by others).