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).