bug#14973: Unfill for Emacs

[Eli Zaretskii]

> Date: Sun, 28 Jul 2013 14:36:05 +0800
> From: Xue Fuqiao <xfq.free@gmail.com>
> 
> There are fill-{paragraph, column}, but I didn't find an unfill command,
> can we add them (maybe in fill.el)?
> 
> (defun unfill-paragraph ()
>   "Replace newline characters in current paragraph by single spaces.
> 
> This command does the inverse of `fill-paragraph'."
>   (interactive)
>   (let ((fill-column most-positive-fixnum))
>     (fill-paragraph nil)))

You need a special command to replace one character by another?