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     admin [rcs-options] files...
          Requires: repository, working directory.
          Changes: repository.
          Synonym: rcs
          This is the cvs interface  to  assorted  administrative
          facilities,  similar  to  rcs(1).   This  command works
          recursively, so extreme care should be used.
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I am trying hard to understand what the last sentence means, and not
making it.  I think it means you can lock directories as well as files,
but I'm not sure.