/MY_PASSWORD=passwd DCE requires that you specify your current DCE password for authentication purposes. If you do not specify your DCE password with this qualifier you are prompted for it interactively, regardless of if you are running in interactive mode or not. Omitting this qualifier and allowing IMPORT to prompt you for your DCE password has the advantage that in this case the password is not echoed and does therefore not appear on your terminal if you are an interactive user.