Qualifiers

/BEFORE=date-time
   Deletes all of the history information before a specified time. A
   single entry is made in the history file specifying that a section
   of the history data has been removed. This entry is made at the
   location in the history file where the lines were deleted.

   The time value can be an absolute, delta, or combination time
   value, or one of the following keywords: TODAY, TOMORROW, or
   YESTERDAY.  If the time value is a future value, CMS uses the
   current time.  

/CONFIRM (D)
   Controls whether CMS prompts you for confirmation before each
   transaction.

   When you run CMS in interactive mode, CMS prompts you for
   confirmation. If you type YES, ALL, TRUE, or 1, CMS executes the
   transaction. If you type NO or QUIT or press RETURN, no action
   is performed. If you type any other character, CMS continues to
   prompt until you type an acceptable response.

   CMS does not prompt for confirmation in batch mode.

/LOG (D)
   Controls whether CMS displays success and informational messages
   on the default output device. By default, if the command executes
   successfully, CMS displays a success message. If you specify
   /NOLOG, success and informational messages are suppressed. Any
   warning, error, or fatal error messages are displayed regardless
   of whether /LOG or /NOLOG is specified.

/OCCLUDE[=option,...]
   Controls whether CMS selects the first instance of the specified
   object, or all instances of the specified object in the library
   search list. The options field contains one or more keywords
   associated with the name of the object. The options field can
   contain the following keywords:

      ALL--equivalent to OTHER
      OTHER (D)
      NOOTHER
      NONE--equivalent to NOOTHER

   You can specify either ALL, NONE, or the [NO]OTHER keyword.

   By default, CMS performs occlusion for all objects; that is, CMS
   selects only the first occurrence of a specified object.

/OBJECT=object-expression
   Specifies an object about which history information is to be
   deleted. The object expression can be one or more class names,
   element names, group names, a wildcard expression, or a list of
   any of these, separated by commas. If you do not specify an object
   expression, CMS deletes all classes, elements, and group
   transaction records in the library subject to the constraints
   imposed by other qualifiers.

/OUTPUT[=file-specification]
   Directs CMS to write output to the specified file. If you omit the
   /OUTPUT qualifier (or if you specify /OUTPUT but do not provide a
   file specification), CMS creates a file named HISTORY.DMP in your
   current default directory.

/TRANSACTIONS=(keyword,...)/NOTRANSACTIONS=(keyword,...)
   Deletes all transaction records generated by a specific command.
   You can specify the following keywords with this qualifier:

   ACCEPT   FETCH     REMOVE
   ALL      INSERT    REPLACE
   CANCEL   MARK      RESERVE
   COPY     MODIFY    REVIEW
   CREATE   REJECT    SET
   DELETE   REMARK    UNRESERVE
                      VERIFY

   If you specify more than one keyword, you must enclose the keyword
   list in parentheses. The /TRANSACTIONS qualifier directs CMS
   to delete transaction records for only the listed keywords. The
   /NOTRANSACTIONS qualifier directs CMS to delete transaction records
   for all keywords except the listed keywords. If you omit the
   /TRANSACTIONS qualifier (or if you specify /TRANSACTIONS but do
   not provide any keywords), CMS deletes transaction records for all
   transaction types.

/USER=username
   Deletes all transaction records created by the specified user.