Lzip



In addition, KLHDC1 was unable to inhibit LZIP/CREB3-mediated transcriptional activation. Thus, KLHDC1 and KLHDC2 have differential localization and activity in cultured mammalian cells. Invitrogen Anti-LZIP Polyclonal, Catalog # PA5-76098. Tested in Western Blot (WB), Immunofluorescence (IF) and Immunocytochemistry (ICC) applications. This antibody reacts with Human, Mouse samples. Supplied as 100 µL purified antibody (1 mg/mL).

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Introduction

Lzip is a lossless data compressor with a user interface similar to the oneof gzip or bzip2. Lzip uses a simplified form of the 'Lempel-Ziv-Markovchain-Algorithm' (LZMA) stream format, chosen to maximize safety andinteroperability. Lzip can compress about as fast as gzip (lzip -0) orcompress most files more than bzip2 (lzip -9). Decompression speed isintermediate between gzip and bzip2. Lzip is better than gzip and bzip2 froma data recovery perspective. Lzip has been designed, written, and testedwith great care to replace gzip and bzip2 as the standard general-purposecompressed format for unix-like systems.

For compressing/decompressing large files on multiprocessor machinesplzip can be much faster than lzip at the cost of aslightly reduced compression ratio.

For creation and manipulation of compressed tar archivestarlz can be more efficient than using tar andplzip because tarlz is able to keep the alignment between tar members andlzip members.

The lzip file format is designed for data sharing and long-term archiving,taking into account both data integrity and decoder availability:

  • The lzip format provides very safe integrity checking and some datarecovery means. The program lziprecovercan repair bit flip errors (one of the most common forms of datacorruption) in lzip files, and provides data recovery capabilities,including error-checked merging of damaged copies of a file.
  • The lzip format is as simple as possible (but not simpler). The lzipmanual provides the source code of a simple decompressor along with adetailed explanation of how it works, so that with the only help of thelzip manual it would be possible for a digital archaeologist to extractthe data from a lzip file long after quantum computers eventuallyrender LZMA obsolete.
  • Additionally the lzip reference implementation is copylefted, whichguarantees that it will remain free forever.

A nice feature of the lzip format is that a corrupt byte is easier to repairthe nearer it is from the beginning of the file. Therefore, with the help oflziprecover, losing an entire archive just because of a corrupt byte nearthe beginning is a thing of the past.

Lzip uses the same well-defined exit status values used by bzip2, whichmakes itsafer than compressors returning ambiguous warning values (like gzip)when it is used as a back end for other programs like tar or zutils.

Introductory links

Benchmark -Some tests showing the ability of lzip to replace gzip and bzip2 as generalpurpose compressor for unix-like systems from a performance point of view.

Quality assurance -Design, development, and testing of lzip.

Safety of the lzip format -This article measures the safety of lzip's integrity checking and explainswhy lzip achieves a high accuracy in the detection of errors.

Lzip CompressedFormat and the application/lzip Media Type -Internet-Draft at the IETF site.

The lzip format(slides) -Talk given at the GNU Hackers Meeting 2019.

Xz format inadequate for long-term archiving -This article describes the reasons why you should switch to lzip if you areusing xz for anything other than compressing short-lived executables.

Other features

Lzip will automatically use for each file the largest dictionary size thatdoes not exceed neither the file size nor the limit given. Keep in mind thatthe decompression memory requirement is affected at compression time by thechoice of dictionary size limit.

When compressing, lzip replaces every file given in the command linewith a compressed version of itself, with the name 'original_name.lz'.

(De)compressing a file is much like copying or moving it; therefore lzippreserves the access and modification dates, permissions, and, whenpossible, ownership of the file just as 'cp -p' does. (If the user ID orthe group ID can't be duplicated, the file permission bits S_ISUID andS_ISGID are cleared).

Lzip is able to read from some types of non-regular files if either theoption '-c' or the option '-o' is specified.

If no file names are specified, lzip compresses (or decompresses) fromstandard input to standard output. Lzip will refuse to read compressed datafrom a terminal or write compressed data to a terminal, as this would beentirely incomprehensible and might leave the terminal in an abnormal state.

Lzip will correctly decompress a file which is the concatenation of two ormore compressed files. The result is the concatenation of the correspondingdecompressed files. Integrity testing of concatenated compressed files isalso supported.

Lzip can produce multimember files, and lziprecover can safely recover theundamaged members in case of file damage. Lzip can also split the compressedoutput in volumes of a given size, even when reading from standard input.This allows the direct creation of multivolume compressed tar archives.

Lzip is able to compress and decompress streams of unlimited size byautomatically creating multimember output. The members so created are large,about 2 PiB each.

In spite of its name (Lempel-Ziv-Markov chain-Algorithm), LZMA is not aconcrete algorithm; it is more like 'any algorithm using the LZMA codingscheme'. For example, the option '-0' of lzip uses the scheme in almost thesimplest way possible; issuing the longest match it can find, or a literalbyte if it can't find a match. Inversely, a much more elaborated way offinding coding sequences of minimum size than the one currently used by lzipcould be developed, and the resulting sequence could also be coded using theLZMA coding scheme.

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Lzip currently implements two variants of the LZMA algorithm; fast(used by option '-0') and normal (used by all other compression levels).

The high compression of LZMA comes from combining two basic, well-provencompression ideas: sliding dictionaries (LZ77/78) and markov models (thething used by every compression algorithm that uses a range encoder orsimilar order-0 entropy coder as its last stage) with segregation ofcontexts according to what the bits are used for.

The ideas embodied in lzip are due to (at least) the following people:Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrey Markov (for thedefinition of Markov chains), G.N.N. Martin (for the definition of rangeencoding), Igor Pavlov (for putting all the above together in LZMA), andJulian Seward (for bzip2's CLI).

Related projects

Plzip -A multi-threaded compressor using the lzip file format.

Tarlz -An archiver with multi-threaded lzip (de)compression.

Lzlib -A compression library for the lzip file format, written in C.

Lziprecover -A data recovery tool and decompressor for the lzip format.

Zutils -Replacement for zcat, zdiff, zgrep, etc, that understands lzip, bzip2,and gzip formats.

Lunzip -A decompressor for lzip files, written in C.

Clzip -A C implementation of lzip for systems lacking a C++ compiler.

Pdlzip -A limited, 'public domain' C implementation of the lzip data compressor,intended for those who can't distribute GPL licensed Free Software.Pdlzip is also able to decompress legacy lzma-alone (.lzma) files.

Lzd -An educational decompressor for the lzip format.

Xlunzip -A test tool for the lzip_decompress linux module.

Documentation

The manual is available in the info system of the GNUOperating System. Use info to access the top level infopage. Use info lzip to access the lzip section directly.

An online manual for lzip can be foundhere.

Download

The latest released version of lzip can be found athttp://download.savannah.gnu.org/releases/lzip/.You may also subscribe tolzip-bugand receive an email every time a new version is released.

A Windows32 port of lzip can be downloaded from the Savannah downloadlink just above. More ports of lzip for Windows can be found in theLinks section below. A Windows port (32 and 64 bits) of plzip can bedownloaded from the plzip page above.

You may compile and optionally install lzip by running the following commands:

then (as root) type:

Once lzip is installed, the files from archive 'foo.tar.lz' canbe extracted using the commands 'tar -xf foo.tar.lz'or'lzip -cd foo.tar.lz | tar -xf -'.

Lzip

How to get help

For general discussion of bugs in lzip the mailing listlzip-bug@nongnu.orgis the most appropriate forum. Please send messages as plain text.Please do not send messages encoded as HTML nor encoded as base64 MIMEnor included as multiple formats. Please include a descriptive subjectline. If all of the subject are 'bug in lzip' it is impossible todifferentiate them.

An archive of the bug report mailing list is available athttp://lists.gnu.org/mailman/listinfo/lzip-bug.

Lzip

How to help

Lzip Install

To contact the author, either to report a bug or to contribute fixes orimprovements, send mail tolzip-bug@nongnu.org.Please send messages as plain text. If posting patches they should be inunified diff format against the latest version. They should include atext description.

You may also help lzip bydonating money via PayPal or debit/credit card.

See also the lzipproject page at Savannah.

Links

Lzip Electrode Gun To Plump Lips

7-Zip ZStandard Edition -A version of 7-Zip with lzip decompression support built in.

Atool,Patool -Command line archive managers that understand lzip files.

GNU Automake -A Makefile generator able to create lzip-compressed tarballs.

Documentation as an indicator of code quality -A different review of lzip.

Dragora GNU/Linux -A GNU/Linux distribution using lzip in its package system.

Easylzma -C library and tools for lzip and lzma-alone file formats.

File Roller -An archive manager for GNOME that understands lzip files.

Lesspipe.sh -View the contents of lzipped files with the pager less.

Libarchive -Multi-format archive and compression library with lzip support.

Littleutils -Convert your files to lzip format.

Man-db -An implementation of the Unix man command able to read lzipped pages.

Midnight Commander -A visual file manager that understands lzip files.

RPM -RPM Package Manager that uses lzip to compress packages.

GNU Tar -Automatically create and extract lzip-compressed tar archives.

GNU Texinfo -The GNU Documentation System understands lzip-compressed manuals.

Z -A simple, safe, and convenient front-end for lzip, bzip2, and gzip.

Ports

Download lzip forAIX,ALT Linux,Amiga (Aminet),Amiga,Android,Arch Linux,DOS,Debian,Exherbo,Fedora,FreeBSD,Gentoo,HP-UX,Mac (fink),NetBSD,NixOS,OS/2,Slackware,Solaris (OpenCSW),Windows (Cygwin),Windows (ezwinports).

Bindings (Interfaces tolanguages other than C/C++)

Common Lisp,Haskell.

Licensing

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Lzip is free software: you can redistribute it and/or modify it underthe terms of the GNU General Public License as published by the FreeSoftware Foundation, either version 2 of the License, or (at youroption) any later version.

Copyright © 2021 Antonio Diaz Diaz
Lzip logo Copyright © 2013 Sonia Diaz Pacheco

You are free to copy, modify, and distribute all or part of this articlewithout limitation.

Updated: 2021-03-26

Lzip Windows

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