summaryrefslogtreecommitdiffstats
path: root/doc/plzip.1
diff options
context:
space:
mode:
Diffstat (limited to 'doc/plzip.1')
-rw-r--r--doc/plzip.130
1 files changed, 26 insertions, 4 deletions
diff --git a/doc/plzip.1 b/doc/plzip.1
index 99dfd8b..694a99d 100644
--- a/doc/plzip.1
+++ b/doc/plzip.1
@@ -1,12 +1,28 @@
.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.46.1.
-.TH PLZIP "1" "February 2018" "plzip 1.7" "User Commands"
+.TH PLZIP "1" "January 2019" "plzip 1.8" "User Commands"
.SH NAME
plzip \- reduces the size of files
.SH SYNOPSIS
.B plzip
[\fI\,options\/\fR] [\fI\,files\/\fR]
.SH DESCRIPTION
-Plzip \- Parallel compressor compatible with lzip.
+Plzip is a massively parallel (multi\-threaded) implementation of lzip, fully
+compatible with lzip 1.4 or newer. Plzip uses the lzlib compression library.
+.PP
+Lzip is a lossless data compressor with a user interface similar to the
+one of gzip or bzip2. Lzip can compress about as fast as gzip (lzip \fB\-0\fR)
+or compress most files more than bzip2 (lzip \fB\-9\fR). Decompression speed is
+intermediate between gzip and bzip2. Lzip is better than gzip and bzip2
+from a data recovery perspective. Lzip has been designed, written and
+tested with great care to replace gzip and bzip2 as the standard
+general\-purpose compressed format for unix\-like systems.
+.PP
+Plzip can compress/decompress large files on multiprocessor machines
+much faster than lzip, at the cost of a slightly reduced compression
+ratio (0.4 to 2 percent larger compressed files). Note that the number
+of usable threads is limited by file size; on files larger than a few GB
+plzip can use hundreds of processors, but on files of only a few MB
+plzip is no faster than lzip.
.SH OPTIONS
.TP
\fB\-h\fR, \fB\-\-help\fR
@@ -71,6 +87,12 @@ alias for \fB\-9\fR
.TP
\fB\-\-loose\-trailing\fR
allow trailing data seeming corrupt header
+.TP
+\fB\-\-in\-slots=\fR<n>
+number of 1 MiB input packets buffered [4]
+.TP
+\fB\-\-out\-slots=\fR<n>
+number of 1 MiB output packets buffered [64]
.PP
If no file names are given, or if a file is '\-', plzip compresses or
decompresses from standard input to standard output.
@@ -95,8 +117,8 @@ Plzip home page: http://www.nongnu.org/lzip/plzip.html
.SH COPYRIGHT
Copyright \(co 2009 Laszlo Ersek.
.br
-Copyright \(co 2018 Antonio Diaz Diaz.
-Using lzlib 1.10
+Copyright \(co 2019 Antonio Diaz Diaz.
+Using lzlib 1.11
License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
.br
This is free software: you are free to change and redistribute it.