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

       /LOG_FILE=file

    Optional. Default: no logging.

    Logs a copy of the output to the specified file. Output continues
    to be directed to SYS$OUTPUT while it is being recorded in the
    log file.

    Not valid with /SYSERROR.