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From: Sam Steingold <sds@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: too many buffers
Date: Wed, 20 Jan 2010 14:06:01 -0500
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To: andrea <andrea.crotti.0@gmail.com>
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andrea wrote:
> 
> Can I limit the creation of new buffers or maybe I should write some
> functions that cleans the situation automatically (using ibuffer maybe)?

enable midnight.el to clean up unused buffers.
e.g.,
(custom-set-variables '(midnight-delay 7200 t (midnight)))
in your .emacs will remove old unused buffers at 2 am.