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From: Emanuel Berg <embe8573@student.uu.se>
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Subject: Re: How to get the ~ functionality of vi
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Cecil Westerhof <Cecil@decebal.nl> writes:

> In vi you can use ~ to flip the case of
> a character. Does Emacs has something
> like that?

Try this:

    (defun flip-case ()
      (interactive)
      (let ((c (string-to-char (thing-at-point 'char t))))
        (delete-char 1)
        (cond ((and (>= c ?A) (<= c ?Z)) (insert-char (downcase c)))
              ((and (>= c ?a) (<= c ?z)) (insert-char (upcase   c)))
              (t                         (insert-char c)))) )
    (global-set-key "\C-cf" #'flip-case)

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