/OUTPUT[=filespec]

    Controls where the output of the command is sent. If you do not
    enter the /OUTPUT qualifier or if you enter it without a file
    specification, the output is sent to the default output stream
    or device for the current process, which is identified by the
    logical name SYS$OUTPUT.

    If you enter the /OUTPUT qualifier with a partial file
    specification (for example, only a directory name), SET AUDIT
    assigns the file name SHOW with the default file type of .LIS.
    The file specification cannot include the asterisk (*)  and the
    percent sign (%)  wildcard characters.