Unison

A new convention for release numbering: releases will continue to be given numbers of the form X.Y.Z, but from now on, just the major version number (X.Y) will be considered significant when checking compatibility between client and server versions. There is a warning (failure in batch mode) when one path is completely emptied. This prevents Unison from deleting everything on one replica when the other disappears. A diff bug where no difference was shown the first time the diff command was given has been fixed. There are user interface improvements.

The archive format has changed. Major tidying and enhancement of the 'merge' functionality. Files larger than 2 Gb are now supported. This release adds preliminary (and still somewhat experimental) support for the Apple OS X operating system.

Major enhancements include a multi-threaded file
transport module, which can result in 5-10x
improvements in transfer speeds. The "hanging
transfer" bug in 2.8.1 has been fixed, along with
some subtle but potentially serious bugs in the
synchronization logic.

Fixes for a bug in 2.7.4 that prevented the client from establishing a connection with the server, and a bug in 2.7.1 that hung instead of giving a correct diagnostic when used with an incompatible server. These bugs affect only installation.