The Dictionary Management Utility enables you to create and  maintain
  the  directory hierarchy and to manage the dictionary's history lists
  and access control lists.

  You can use abbreviations for any of DMU  command  words.   The  only
  restriction  is  that  you  must  specify  enough characters to avoid
  ambiguity.  You can interrupt the execution of DMU commands by typing
  CTRL/C.

  An exclamation point (!) occurring anywhere except  within  a  quoted
  string is a comment delimiter.