move /Y filename folderDestination
Use this option if you want MOVE to replace existing file(s) without prompting you for a confirmation. Otherwise, the replacement will not be made until you confirm it. If you use MOVE as part of a batch file, existing files will be replaced without a confirmation prompt. This option will override all defaults as well as the current setting of the COPYCMD environment variable.
ref : http://www.easydos.com/move.html