I think this article by Brian Cardarella may answer my question.  I'll
figure this out and document what I had to do for all the other
"noobs" out there.

http://cardarella.blogspot.com/2010/01/rails-2-rails-3-side-by-side.html

On May 24, 11:41 am, Hassan Schroeder <hassan.schroe...@gmail.com>
wrote:
> On Mon, May 24, 2010 at 11:32 AM, Robert <robert...@gmail.com> wrote:
> > Thanks.  I do understand that.  However, my question is that if I
> > execute the command "sudo gem install rails --pre", won't I be
> > overwriting my existing Rails 2.3.5 executable which resides in /usr/
> > bin?  That's what I'm really worried about.
>
> Have you *looked* at that "executable"?   :-)
>
> It might go a long way towards alleviating your concern.
>
> --
> Hassan Schroeder ------------------------ hassan.schroe...@gmail.com
> twitter: @hassan
>
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