When 'confirm' is on, certain operations that would normally fail because of unsaved changes to a buffer, e.g. ":q" and ":e", instead raise a dialog asking if you wish to save the current file(s). You can still use a ! to unconditionally abandon a buffer. If 'confirm' is off you can still activate confirmation for one command only (this is most useful in mappings) with the :confirm command. Also see the confirm() function and the 'v' flag in 'guioptions'.

(default off)