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Subject: Re: How can I find changes before saving a file?
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Thanks, that's pretty much what I was looking for! 

I seem to have too old emacs version (20.4.*) so M-x compare-windows
does not work (at least it doesn't for me). One should have 20.6 and
later according to other postings.

But "Tools->Compare->Two Buffers" does the job just fine!

Rgds
Peter

"Ehud Karni" <ehud@unix.mvs.co.il> wrote in message news:<mailman.1868.1045061850.21513.help-gnu-emacs@gnu.org>...
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> I think renaming the buffer wouldn't do, Emacs still remembers the DISK
> file name (even after renaming), visiting the file again will go back
> to the same buffer.
> 
> You could do M-x shell-command cat <file-name> and compare the
> current buffer with "*Shell Command Output*".
> 
> Ehud.
>