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

    /OUTPUT=filespec

    Directs MMS to write action lines and output to the specified
    file. Error messages preceded by "%MMS" are not written to this
    output file, but instead are written to SYS$ERROR. The /OUTPUT
    qualifier affects the behavior of MMS, but not the execution of
    action lines.

    The filespec is an OpenVMS file specification or a logical name
    that identifies the output file. The default file type is .LOG.
    If you do not specify the /OUTPUT qualifier on the MMS command
    line, MMS writes all action lines, messages, and output to
    SYS$OUTPUT.

    If you specify the /NOVERIFY qualifier on the same MMS command
    line with /OUTPUT, MMS does not write action lines to the output
    file.

    If you specify /OUTPUT and your command-line interpreter is DCL,
    MMS automatically prefixes a dollar sign ($)  to any action
    line that does not begin with one. Thus, you can use the file
    generated by /OUTPUT as a DCL command procedure.