Syntax:

      /LISTING [= file-specification]

  Use /LISTING to write the listed information  into  an  output  file.
  The  file  specification  is a standard VMS file specification naming
  the /LISTING file.  The default file type is .LIS.

  If you do not specify a /LISTING  file,  the  output  is  written  to
  SYS$OUTPUT.