confirm-kill-emacsconfirm-kill-emacs is a variable defined in `
files.el'. Its value is
nilDocumentation: How to ask for confirmation when leaving Emacs. If nil, the default, don't ask at all. If the value is non-nil, it should be a predicate function; for example `yes-or-no-p'. You can customize this variable. This variable was introduced, or its default value was changed, in version 21.1 of Emacs.