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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: show-all-if-ambiguous in emacs?
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Jiri Pejchal <xpejchal@fi.muni.cz> writes:

> I like to set the following variable in my ~/.bashrc to `on': 
>
>  `show-all-if-ambiguous'
>
> This alters the default behavior of the completion functions. If set to
> `on', words which have more than one possible completion cause the
> matches to be listed immediately instead of ringing the bell. The
> default value is `off'.
>
> Can I get similar behavior with mini-buffer completion?

Try `M-x ido-mode'.  It doesn't do exactly what you describe, but it's
somewhat similar.