Variable: dired-backup-overwrite
dired-backup-overwrite is a customizable variable defined in
dired-aux.el.gz.
Value
nil
Documentation
Non-nil if Dired should ask about making backups before overwriting files.
Special value always suppresses confirmation.
Source Code
;; Defined in /usr/src/emacs/lisp/dired-aux.el.gz
;;; Copy, move/rename, making hard and symbolic links
(defcustom dired-backup-overwrite nil
"Non-nil if Dired should ask about making backups before overwriting files.
Special value `always' suppresses confirmation."
:type '(choice (const :tag "off" nil)
(const :tag "suppress" always)
(other :tag "ask" t))
:group 'dired)