1    /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.

2    /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.

3    /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.

4    /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.

5    /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.

6    /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.

7    /TRANSACTIONS=(keyword,...)

8    /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.

9    /USER=username

    Deletes all transaction records created by the specified user.