/OUTPUT[=file-spec]

    Writes the SHOW IMAGE output to a specified file rather than
    to the current SYS$OUTPUT device. If you specify the /OUTPUT
    qualifier without a file specification, the output is directed to
    SYS$OUTPUT. If you omit the file type in the file specification,
    the default file type is .LIS. If you specify a file type and
    omit the file name, the default file name is SHOW. No wildcard
    characters are allowed in the file specification.