VMS Help SHOW, CLUSTER, Qualifiers, /OUTPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /OUTPUT=filespec

    Directs the output from SHOW CLUSTER to the specified file
    instead of the current SYS$OUTPUT device.

    SHOW CLUSTER output is always in printable file format,
    regardless of the file or device type specified. Output can be
    up to 132 columns wide and can be sent to any file, terminal, or
    print device.

    You can also direct output to a file with the WRITE command.

    The filespec is the name of the file or device to which SHOW
    CLUSTER output is directed. The default file name is SHOW_
    CLUSTER.LIS.

    You can direct output to a device other than SYS$OUTPUT, by
    specifying a valid device name.