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svnadmin setuuid — Reset the repository UUID.
          svnadmin setuuid REPOS_PATH [NEW_UUID]
        
Reset the repository UUID for the repository located
        at REPOS_PATH.
        If NEW_UUID is provided, use
        that as the new repository UUID; otherwise, generate a
        brand-new UUID for the repository.
If you've svnsynced /var/svn/repos
        to /var/svn/repos-new and intend to use repos-new as your
        canonical repository, you may want to change the UUID for
        repos-new to the UUID of repos so that your users don't
        have to check out a new working copy to accommodate the
        change:
$ svnadmin setuuid /var/svn/repos-new 2109a8dd-854f-0410-ad31-d604008985ab
As you can see, svnadmin setuuid has no output upon success.