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(efaq)Turning on auto-fill by default

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How do I turn on `auto-fill-mode' by default?
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   To turn on `auto-fill-mode' just once for one buffer, use `M-x
auto-fill-mode'.

   To turn it on for every buffer in a certain mode, you must use the
hook for that mode.  For example, to turn on `auto-fill' mode for all
text buffers, including the following in your `.emacs' file:

     (add-hook 'text-mode-hook 'turn-on-auto-fill)

   If you want `auto-fill' mode on in all major modes, do this:

     (setq-default auto-fill-function 'do-auto-fill)