Unison is a file-synchronization tool for Unix and Windows, written in OCaml. It allows two replicas of a collection of files and directories to be stored on different hosts, modified separately, and then brought up to date by propagating the changes in each replica to the other.
Unison offers several advantages over various synchronization methods such as CVS, Coda, rsync, Intellisync, etc. Unison can run on and
synchronize between Windows and many UNIX platforms. Unison can synchronize changes to files and directories in both directions, on the same machine, or across a network using ssh or a direct socket connection.
Transfers are optimised using a version of the rsync protocol, has a clear and precise specification, and is resilient to failure due to its careful handling of replicas.

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    New stable version: Unison 2.27.57

    On behalf of the Unison team, I am delighted to announce that Unison 2.27 is now designated as stable, replacing 2.13 and 2.17 as the recommended version for

    Update to beta-release

    Thanks to testing and debugging help from Karl M, the issue with fastcheck under Windows appears to be resolved. The beta-release has been updated to version

    [unison-users] New beta-release (2.27)

    [A better-formatted version of the announcement... -B] On behalf of all the Unison developers and contributors, I am delighted to announce a new beta-release.

    New beta-release (2.27)

    On behalf of all the Unison developers and contributors, I am delighted to announce a new beta-release. Sources are now available from the download page,

    New unison beta-release (2.17) available; 2.13 promoted to stable

    The Unison team is pleased to announce a new beta-release, version 2.17. The changes in this version are substantial, but mostly internal: we've completely

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Download Page
38 downloads

Who uses Unison?

Yoric eridius Aristedes Maniatis hermeschris Francisco R. Santos Mykola Nikishov Dustin J. Mitchell michaelh makowski Drangon sfischer Guttorm Flatabø

Who contributes to Unison?

bcpierce ben vouillon trevor lescuyer tjim schmitta craigf
I'm a contributor

Who manages Unison?

I'm a manager

Where in the world?



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Project Cost

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Codebase 6,154
Effort (est.) 1 Person Years
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$ 73,760