REPLACE
Replaces files.

REPLACE [drive1:][path1]filename [drive2:][path2] [/A] [/P] [/R] [/W]
REPLACE [drive1:][path1]filename [drive2:][path2] [/P] [/R] [/S] [/W] [/U]

[drive1:][path1]filename Specifies the source file or files.
[drive2:][path2] Specifies the directory where files are to be
replaced.
/A Adds new files to destination directory. Cannot
use with /S or /U switches.
/P Prompts for confirmation before replacing a file or
adding a source file.
/R Replaces read-only files as well as unprotected
files.
/S Replaces files in all subdirectories of the
destination directory. Cannot use with the /A
switch.
/W Waits for you to insert a disk before beginning.
/U Replaces (updates) only files that are older than
source files. Cannot use with the /A switch.