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From: Kevin Rodgers <ihs_4664@yahoo.com>
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Subject: Re: Keep losing work in non-file-visiting buffers
Date: Tue, 02 Dec 2003 16:42:31 -0700
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sebyte wrote:

>     Anyone know of a variable/method/function that will prompt you to 
> save your work in non-file-visiting buffers before you kill them or kill 
> your emacs session?

(setq-default buffer-offer-save t)	; for save-buffers-kill-emacs


(add-hook 'kill-buffer-query-functions	; for kill-buffer
           (lambda ()
             (or buffer-file-name
                 (not (buffer-modified-p))
                 (yes-or-no-p (format "Buffer %s modified; kill anyway? "
                                      (buffer-name))))))

-- 
Kevin Rodgers