File unison-2.40.README.SUSE of Package unison2.40

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File unison-2.40.README.SUSE of Package unison2.40

Unison is a file synchronizer for Unix and Windows. It allows two replicas of a
collection of files and directories to be stored on different hosts (or
different disks on the same host), modified separately, and then brought up to
date by propagating the changes in each replica to the other.

The repositories at http://download.opensuse.org/repositories/home:/ecognito/
provide several complementary packages of unison for openSUSE:

Package name  Unison version  Executable name
------------  --------------  --------------------
unison2.27     2.27.*         /usr/bin/unison-2.27
unison2.32     2.32.*         /usr/bin/unison-2.32
unison2.40     2.40.*         /usr/bin/unison-2.40

Separate packages and executables are needed because Unison's protocol for
exchanging information on the network is incompatible between these versions.
Two versions of Unison are compatible if and only if the first two numbers in
their version strings are the same.  For example, all versions 2.27.* are
mutually compatible, and incompatible with versions 2.32.*.  If you are running
e.g. Unison version 2.27.* and attempt to synchronize with a server running
version 2.32.*, Unison will issue an error message about incompatible versions
and quit.  By installing one or more of the packages listed above, you can run
whichever version you need in order to synchronize with your server.

In addition to the executables named above, the package postinstallation script
uses update-alternatives(8) to install a symlink /usr/bin/unison pointing to
/etc/alternatives/unison, which in turn points to one of the above-named
executables.  By default this symlink will track the highest-numbered version
of Unison that you install on your system, unless you reset it, either manually
or using alternatives(8).  See update-alternatives(8) for more details.

If the server provides multiple versions of Unison, then you can invoke Unison
on the client with e.g. '-servercmd /usr/bin/unison-2.xx' to run the version
you want on the server, or put 'servercmd /usr/bin/unison-2.xx' into the
client's preference file.

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