How to decompress x.tar.xz format files under Linux
A lot of software found today is in the tar.xz format, which is a lossless data compression file format that uses the LZMA compression algorithm. Like gzip and bzip2, it supports multiple file compression, but the convention is not to compress more than one target file into the same archive. Instead, xz is often used as a compression format for archive files themselves, such as archives created with the tar or cpio Unix programs. xz is used in GNU coreutils (version 7.1 or later). xz is included as a compression package in Fedora (since Fedora 12), Arch Linux, FreeBSD, Slackware Linux, CRUX and Funtoo.
xz utils is the next generation of lzma utils. lzma utils was renamed xz utils.
xz utils takes twice as long as bzip2 to compress,
half as long as lzma utils to compress, half
as large a file as bzip2 to compress,
slightly larger than lzma utils to compress,
one-third as long as bzip2 to decompress,
slightly faster than lzma utils to decompress,
and only twice as long as gzip to decompress.
When compressing, the files generated by xz utils using *.xz format are slightly larger than those generated by *.lzma format. The test sample is small, and the results of multiple tests are inconsistent. It is impossible to determine whether xz utils using *.xz or *.lzma format has an advantage in compression and decompression time.
So far, lzma utils still has the best compression ratio, and xz utils has the best decompression time.
An implementation of the xz file format, the XZ utility, is freely available on the web. GNU tar uses this software to transparently support the xz file format (just as it does gzip or bzip2) since version 1.22. As a lot of software has entered the public domain (e.g. liblzma, etc.), version 4.999.9beta of this implementation is released under the terms of the GNU LGPL and the GNU GPL.
7-Zip supports the xz file format in version 9.04 beta.
First go to http://download.chinaunix.net/download/0014000/13078.shtml
Download the xz-5.0.3.tar.bz2 decompression tool from the page, then compile and install it
tar -xf xz-5.0.3.tar
cd xz-5.0.3
./configure
make
make install
In this way, you can use the xz command to decompress the tar.xz format file.
1. xz -d linux-3.1-rc4.tar.xz
2. tar -xf linux-3.1-rc4.tar
Here is the downloaded Linux kernel source code. You can clearly see that the tar.xz is only a few dozen M in size, but after decompression it is several hundred M. This is indeed a very high compression ratio.
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