XZ Utils is free general-purpose data compression software with high
compression ratio. XZ Utils were written for POSIX-like systems, but also
work on some not-so-POSIX systems. XZ Utils are the successor to LZMA Utils.|
The core of the XZ Utils compression code is based on LZMA SDK, but it has
been modified quite a lot to be suitable for XZ Utils. The primary
compression algorithm is currently LZMA2, which is used inside the .xz
container format. With typical files, XZ Utils create 30 % smaller output
than gzip and 15 % smaller output than bzip2.
XZ Utils consist of several components:
- liblzma is a compression library with API similar to that of zlib.
- xz is a command line tool with syntax similar to that of gzip.
- xzdec is a decompression-only tool smaller than the full-featured xz tool.
- A set of shell scripts (xzgrep, xzdiff, etc.) have been adapted from gzip to
ease viewing, grepping, and comparing compressed files.
While liblzma has a zlib-like API, liblzma doesn't include any file I/O
functions. A separate I/O library is planned, which would abstract handling
of .gz, .bz2, and .xz files with an easy to use API.
- Emulation of command line tools of LZMA Utils eases transition from LZMA
Utils to XZ Utils.