Description:

Unison is a file-synchronization tool for Unix and Windows. With it, you can store two replicas of a collection of files and directories on different hosts, or even on different disks on the same host. The replicas can be modifed separately, then "synched" by applying the changes in each replica to the other.

Project developers acknowledge that Unison shares a number of features with other tools like configuration management packages, distributed filesystems, uni-directional mirroring utilities and other synchronizers. But this tool is different from them in several significant ways:

• Unison runs just as well on Windows as it does on Unix (Solaris, Linux, OS X and others). It also works across platforms, so you can do cool stuff like, for example, synchronizing a Windows laptop with a Unix server.
• Unison can handle updates to both replicas of a distributed directory structure, unlike simple mirroring or backup utilities, which can't. Updates that do not conflict are propagated automatically, while conflicting updates are detected and displayed.
• Unison is a user-level program, unlike a distributed filesystem, and there is no need to modify the kernel or to have superuser privileges on either host.

Usage Notes:

 Unison comes in mighty handy when you're in need of a great open source file-synchronizer tool.