revert [-nv] [--no-be-activate] [--no-backup-be | --
     require-backup-be] [--backup-be-name name] [--deny-new-be |
     --require-new-be] [--be-name name] (--tagged tag-name ... |
     path-to-file ...)

         Revert files to their as-delivered condition. Either all
         files  tagged  with  a  particular  value, or individual
         files can be reverted. File  ownership  and  protections
         are also restored.

         Caution -

           Reverting some editable files to their default  values
           can  make  the  system unbootable, or cause other mal-
           functions.
         For all other options,  refer  to  the  install  command
         above for usage and their effects.