automatic overwrite with cp

[alex <radsky@ncia.net>]

I've been trying to copy the contents of a partition  (source)  to 
another partition  (destination) that has a large number
of files that need to be overwritten.   The command I've tried is:

    # cp -apRv  source/* /destination/

The command works but it requires that I manually respond 'yes' for each 
overwrite.  I thought that the r or R option
would do an automatic overwrite but apparently it doesn't.

What should the option be to do automatic overwrites with the ' cp ' 
command?