1 \" 2 \" lz4.1: This is a manual page for 'lz4' program. This file is part of the 3 \" lz4 <https://code.google.com/p/lz4/> project. 4 \" 5 6 \" No hyphenation 7 .hy 0 8 .nr HY 0 9 10 .TH lz4 "1" "2014-02-27" "lz4" "User Commands" 11 .SH NAME 12 \fBlz4\fR - Extremely fast compression algorithm 13 14 .SH SYNOPSIS 15 .TP 5 16 \fBlz4\fR [\fBOPTIONS\fR] [-|INPUT-FILE] <OUTPUT-FILE> 17 18 .SH DESCRIPTION 19 .PP 20 \fBlz4\fR is an extremely fast lossless compression algorithm. It is based on 21 the \fBLZ77\fR family of compression scheme. At the compression speed of 400 22 MB/s per core, \fBlz4\fR is also scalable with multi-core CPUs. It features 23 an extremely fast decoder, with speed in multiple GB/s per core, typically 24 reaching the RAM speed limits on multi-core systems. \fBlz4\fR supports 25 following options 26 27 .SH OPTIONS 28 .TP 29 .B \-1 30 fast compression (default) 31 .TP 32 .B \-9 33 high compression 34 .TP 35 .B \-d 36 decompression 37 .TP 38 .B \-f 39 overwrite output without prompting 40 .TP 41 .B \-h/\-H 42 display help/long help and exit 43 .TP 44 .B \-V 45 display Version number and exit 46 .TP 47 .B \-v 48 verbose mode 49 .TP 50 .B \-q 51 suppress warnings; specify twice to suppress errors too 52 .TP 53 .B \-c 54 force write to standard output, even if it is the console 55 .TP 56 .B \-t 57 test compressed file integrity 58 .TP 59 .B \-z 60 force compression 61 .TP 62 .B \-l 63 use Legacy format (useful for Linux Kernel compression) 64 .TP 65 .B \-B# 66 block size [4-7](default : 7) 67 B4= 64KB ; B5= 256KB ; B6= 1MB ; B7= 4MB 68 .TP 69 .B \-BD 70 block dependency (improve compression ratio) 71 .TP 72 .B \-BX 73 enable block checksum (default:disabled) 74 .TP 75 .B \-Sx 76 disable stream checksum (default:enabled) 77 .TP 78 .B \-b 79 benchmark file(s) 80 .TP 81 .B \-i# 82 iteration loops [1-9](default : 3), benchmark mode only 83 84 .SH BUGS 85 Report bugs at:- https://code.google.com/p/lz4/ 86 87 .SH AUTHOR 88 Yann Collet 89
