/sys$common/syshlp/helplib.hlb DUMP, Qualifiers, /OUTPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /OUTPUT[=filespec]

    Specifies the output file for the dump. If you do not specify
    a file specification, the default is the file name of the file
    being dumped and the file type .DMP. If the /OUTPUT qualifier
    is not specified, the dump goes to SYS$OUTPUT. The /OUTPUT and
    /PRINTER qualifiers are mutually exclusive.