lz4(1)                           User Commands                          lz4(1)











NAME
       lz4 - Extremely fast compression algorithm


SYNOPSIS
       lz4 [OPTIONS] [-|INPUT-FILE] <OUTPUT-FILE>


DESCRIPTION
       lz4 is an extremely fast lossless compression algorithm. It is based on
       the LZ77 family of compression scheme. At the compression speed of 400
       MB/s per core, lz4 is also scalable with multi-core CPUs. It features
       an extremely fast decoder, with speed in multiple GB/s per core,
       typically reaching the RAM speed limits on multi-core systems. lz4
       supports following options


OPTIONS
       -1
               fast compression (default)

       -9
               high compression

       -d
               decompression

       -f
               overwrite output without prompting

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

       -V
               display Version number and exit

       -v
               verbose mode

       -q
               suppress warnings; specify twice to suppress errors too

       -c
               force write to standard output, even if it is the console

       -t
               test compressed file integrity

       -z
               force compression

       -l
               use Legacy format (useful for Linux Kernel compression)

       -B#
               block size [4-7](default : 7)
               B4= 64KB ; B5= 256KB ; B6= 1MB ; B7= 4MB

       -BD
               block dependency (improve compression ratio)

       -BX
               enable block checksum (default:disabled)

       -Sx
               disable stream checksum (default:enabled)

       -b
               benchmark file(s)

       -i#
               iteration loops [1-9](default : 3), benchmark mode only


BUGS
       Report bugs at:- https://code.google.com/p/lz4/


AUTHOR
       Yann Collet



lz4                               2014-02-27                            lz4(1)