Guia Compresion Con 7Zip En Ingles

7-ZIP – Quality Opensource Compression
*** CONTENTS ***
1. General information
2. Basic and advanced usage
3. Analysis
4. Conclusion
5. Worth installing?
6. Relevant links
*** GENERAL INFO ***
* Overview
Apparently, Russians are committed to providing the world with great compression software. After
Eugene Roshal and his WinRAR program (1993), it was Igor Pavlov’s turn to unleash amasterpiece
upon computers worldwide with 7-Zip (1999).
The 7-Zip project is an opensource compression program that successfully competes with
established leaders in this segment of the software market, namely WinRAR, WinZip and WinAce.
It is not as widely known but, as you will see in the following article, it’s worth a look and may
even win its place on your HDD.
Its default format forcreating archives, 7z, based on the GNU LZMA method, yields excellent
compression ratios, sometimes even better than RAR’s.
* Availability and licensing information
The current version of 7-Zip is 4.42, released on the 14th of May 2006 as a small-sized (818KB)
handy installer. A Windows x64 download is also available, weighing in a bit more at 1.2MB. 7Zip’s full source code can also be downloaded,an interesting reference for developers interested in
compression techniques.
The command line version of 7-Zip has been ported to UNIX-like systems by an independent
developer, under the name p7zip. Mac OS X users can also use EZ 7z, a front-end to p7zip.
Although 7-Zip is opensource and free to use for personal or commercial purposes, its further
development can be supported by registeringthe program for US$20.
* Installation and initial configuration (wizards?)
The setup wizard is based on Nullsoft’s NSIS – a
renowned opensource tool for the development of
Windows installers. It is not digitally signed, so running
it will trigger a warning for Windows XP SP2 users.
7-Zip can be installed silently, without any intervention
from the user by launching the downloaded file withthe
parameters “/S /D=dir”, where “dir” is the program
installation directory.
No options or other means of customization are exposed
during the install process, which may cause some
frustration for power users. On the other hand, this is good when you are so eager to try out the
program that you can’t be bothered with details.
* Uninstallation info
The usage of NSIS provides a properuninstall routine, accessible from the Add/Remove feature in

the Windows Control Panel.
*** USAGE ***
* Basic Usage
Everybody works with archives nowadays. Even if you made
last year’s resolution not working with them, you will
occasionally stumble upon one or two, courtesy of your
friends or co-workers. Yes, they love you very much and they
know you like variety, that’s why you get allkinds of
different formats, such as Zip, RAR and Ace. From time to time you’ll even get some strange
sounding ones, like “tar” or “gz”. Luckily, you can rely on 7-Zip when the time comes to deal with
these menacing files. It supports 7z, ZIP, GZIP, BZIP2 and TAR for both packing and unpacking,
while RAR, CAB, ARJ, LZH, CHM, Z, CPIO, RPM and DEB are supported only for unpacking.
You may havenoticed that the Ace format doesn’t fall in any of the above categories – that’s
because it’s not supported at all, due to licensing issues or, as the author says in the online FAQ,
“plug-in architecture incompatibility”.
Although not “true” archives, ISO files are quite frequently seen these days and it’s nice to be able
to open them with just a (double)click. 7-Zip can’t really be blamed for notincluding this feature,
but it has to be reminded that other similar programs, such as WinRAR, support it. ISO support is
now available since 7-Zip 4.36 Beta.
7-Zip conveniently integrates into Windows Explorer’s
right click menu, creating a “7-Zip” submenu with
several options, configurable from the program’s settings
dialog. The complete set of actions covers most
operations that can be...