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

       /OUTPUT[=filespec]
       /NOOUTPUT

    Controls where the output of the SHOW LOGICAL command is sent.
    By default, the output of the SHOW LOGICAL command is sent to the
    current SYS$OUTPUT device (usually your terminal). To send the
    output to a file, use the /OUTPUT qualifier followed by a file
    specification.

    The asterisk (*)  and the percent sign (%) wildcard characters
    are not allowed in the file specification. If you enter a partial
    file specification (for example, specifying only a directory),
    SHOW is the default file name and .LIS is the default file type.

    If you enter the /NOOUTPUT qualifier, output is suppressed.