svnlook uuid — Print the repository's UUID.
svnlook uuid REPOS_PATH
Print the UUID for the repository. the UUID is the repository's Universal Unique IDentifier. The Subversion client uses this identifier to differentiate between one repository and another.
$ svnlook uuid /usr/local/svn/repos e7fe1b91-8cd5-0310-98dd-2f12e793c5e8