The mr(1) command can checkout, update, or perform other actions on a set of repositories as if they were one combined respository. It supports any combination of subversion, git, cvs, and bzr repositories, and support for other revision control systems can easily be added.
It is extremely configurable via simple shell scripting. Some examples of things it can be configured to do include:
* Update a repository no more frequently than once every twelve hours.
* Run an arbitrary command before committing to a repository.
* When updating a git repository, pull from two different upstreams and merge the two together.
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