Information About7-zip |
| CATEGORIES ABOUT 7-ZIP | |
| free data compression software | |
| free file managers | |
| sourceforge projects | |
| windows compression software | |
7-Zip is an Open Source File Archiver designed originally for the Microsoft Windows operating system, and later made available to other systems. In the form of P7zip , 7-Zip has been ported for use on Unix-like systems such as Linux , FreeBSD and Mac OS X . It is also compatible with DOS via either a DOS port, or by using the HX-DOS extender to run the Windows command-line version. 7-Zip operates primarily with the 7z archive format, as well as being able to read several other archive formats. In operation a user can use the Command Line (all systems), Graphical User Interface ("Windows" only) or seamless Windows shell environment methods of control. 7-Zip began in 2000 and is actively developed by Igor Pavlov. In contrast to the market-leading programs WinZip and WinRAR , which remain as Proprietary competitors, 7-Zip is distributed under the terms of the GNU Lesser General Public License (LGPL) (with the RAR license restrictions), with the AES code under the revised BSD License , and as such is Free Software . THE 7Z ARCHIVE FORMAT See Also: 7z By default, 7-Zip is used to create 7z format archives, with a .7z File Extension . Each archive can contain multiple directories and files. As a ''container'' format, security or size reduction are achieved using a stacked combination of filters. These can consist of pre-processors, compression algorithms and encryption filters.The core .7z compression stage uses a variety of algorithms, the most common of which are Bzip2 and LZMA . Developed by Igor Pavlov, LZMA is a relatively new system, making its debut as part of the 7z format. LZMA consists of a large LZ-based sliding dictionary up to 4GB in size, backed by a Range Coder . LZMA Compression Ratios tend to be very good. Compressed sizes are comparable to other high-gain compression formats, including RAR or ACE , both of which are proprietary. The native 7z file format is open and modular with all filenames stored as Unicode . OTHER SUPPORTED FORMATS 7-Zip supports a number of other compression, and non-compression, archive formats. Supported formats include ZIP , Microsoft cabinet ( CAB ) files, RAR , ARJ , Z , Gzip , Bzip2 , LHA , Tar , Cpio , Rpm and Debian Deb archives. Versions of 7-Zip from 4.42 onwards also support ISO CD/DVD images. 7-Zip is able to open some MSI files, allowing access to the meta-files within along with the main contents. Some Microsoft CAB ( LZX compression) and NSIS (LZMA) installer formats can be opened, making 7-Zip a good tool to check if a given binary file is in fact an archive. When compressing ZIP or gzip files, 7-Zip uses a home-brewed DEFLATE encoder which is often able to achieve higher compression levels than the de facto Zlib implementation, at the expense of compression speed. The 7-Zip deflate encoder implementation is available separately as part of the AdvanceCOMP suite of tools. VARIATIONS In the form of P7zip , the command-line version has been ported for use on Unix-like systems including Linux , FreeBSD and Mac OS X . A 64-bit version is available for X64 Editions Of Windows , with support for large memory maps leading to faster compression. All versions support multi-threading. Two 7za.exe version which contains built-in modules. However, 7za's compression/decompression support is limited to 7z , ZIP , Gzip , Bzip2 , Z and Tar formats. Additionally, a portable version of 7-Zip exists as well. This version runs completely from an external portable drive such as a USB Flash Drive or an MP3 player like an iPod. It is available from PortableApps.com (link below). FEATURES 7-Zip supports many features, some which may not be found in popular commercial compression software.
NOTES SEE ALSO EXTERNAL LINKS
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