/usr/share/doc/xz-utils/README.Debian is in xz-utils 5.1.1alpha+20110809-3.
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Contents:
1. History
2. LZMA Utils compatibility
3. Configuration
History
-------
XZ Utils should have been called LZMA Utils 4.42, but it came too late.
The old .lzma file format has some problems, worst of which is the lack
of magic number, but it gets enough use to still need to be supported.
See /usr/share/doc/xz-utils/history.txt.gz for the full story.
LZMA Utils compatibility
------------------------
To support old scripts and muscle memory, XZ Utils can emulate the
legacy LZMA Utils interface. To use this feature, you can install some
subset of the following list of symbolic links to your $PATH.
lzma, unlzma, lzcat -> /usr/bin/xz
lzgrep, lzegrep, lzfgrep -> /usr/bin/xzgrep
lzless -> /usr/bin/xzless
lzmore -> /usr/bin/xzmore
lzdiff, lzcmp -> /usr/bin/xzdiff
To allow administrators to keep the old lzma package, the xz-utils
package does not provide those links itself. If you would like XZ Utils
to provide these commands by default for all users, install the
xz-lzma package.
Configuration
-------------
The memory usage of xz can vary from a few hundred kilobytes to several
gigabytes depending on the compression settings. If you would like xz
to automatically scale down its settings while compressing to decrease
memory usage, you can declare so by adding an option like the
following to your environment (e.g., in ~/.profile):
XZ_DEFAULTS=--memlimit-compress=256MiB
export XZ_DEFAULTS
See the "Memory usage" section of the xz(1) manual page for details.
-- Jonathan Nieder <jrnieder@gmail.com> Fri, 14 Oct 2011 20:42:05 -0500
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