1    /LOG

       /LOG
       /NOLOG

    Controls whether the DELETE command displays the file
    specification of each deleted file. The default is /NOLOG.

2    /SYSTEM

       /SYSTEM
       /NOSYSTEM

    Controls whether the DELETE command deletes files with the file
    type SYS. Files with the type SYS are usually necessary for the
    operation of an RT-11 system. Only RT-11 volumes handle .SYS
    files in this manner.

    The default is /NOSYSTEM; the DELETE command does not delete
    an RT-11 file with the SYS type, whether matched by a wildcard
    specification or explicitly named. EXCHANGE displays a message
    whenever it skips a SYS file during a delete operation.

3    /VOLUME_FORMAT

       /VOLUME_FORMAT=option

    Defines the physical format of the volume to be processed.
    RT-11 volumes are the only volumes on which DELETE is currently
    supported.