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