dired-no-confirm

dired-no-confirm is a variable defined in `dired.el'.
Its value is

nil

Documentation:
A list of symbols for commands Dired should not confirm, or t.
Command symbols are `byte-compile', `chgrp', `chmod', `chown', `compress',
`copy', `delete', `hardlink', `load', `move', `print', `shell', `symlink',
`touch' and `uncompress'.
If t, confirmation is never needed.

You can customize this variable.