No problem. This need is fit with RVM

try it

hugs
http://beginrescueend.com/rvm/install/



2012/1/24 honey ruby <emailtohoneyr...@gmail.com>

> hey everyone i am using rails 2.3.8 and ruby 1.8.7 . i want  to
> install rails 3 so how can i maintain 2 versions of rails in my pc. i
> wanna learn rails 3 and can any tell the major difference in 2.3.8 and
> rails 3.
>
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