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.  I'd like to be able to
have both Rails 2.3.5 and the Rails 3 beta existing on my machine at
the same time.  Would running the gem install command alter my /usr/
bin/rails executable such that it would contain both versions or
should it create a separate and distinct Rails 3 beta executable?

Thanks again.  I really do appreciate your help.

On May 24, 11:22 am, anon_comp <[email protected]> wrote:
> sorry didn't read your question completely
>
> You can choose your version using this command:
>
> rails _2.3.5_ --version
>
> You can change between versions if you do this and shouldn't harm
> whatever project you have under an old rails verion
>
> On May 24, 2:10 pm, anon_comp <[email protected]> wrote:
>
>
>
> > You need to get into the system.
>
> > Try typing sudo (aka super user/super admin)
>
> > $ sudo
>
> > it'll prompt you to put in your password if you are the admin of your
> > computer.
>
> > Once you're in and have the permisison, you can install rails. (sudo
> > will stay in your command prompt until you exit from it)
>
> > $ sudo gem install rails
>
> > On May 24, 9:35 am, Robert <[email protected]> wrote:
>
> > > I'm trying to install Rails 3 on a brand new MacBook Pro running OS X
> > > 10.6.3, Ruby 1.8.7, and Rails 2.3.5 and I'm wondering if I've hosed
> > > myself.  So far, I've run these commands:
>
> > > $ gem update --system
> > > $ gem install arel tzinfo builder memcache-client rack rack-test rack-
> > > mount erubis mail text-format thor bundler i18n
> > > $ gem install rails --pre
>
> > > However, when I run the last command, I get this error:
>
> > > ERROR:  While executing gem ... (Gem::FilePermissionError)
> > >     You don't have write permissions into the /usr/bin directory.
>
> > > I think it wants me to run the command with sudo so that it can write
> > > over /usr/bin/rails.  But if I do that, won't I be overwriting my
> > > Rails 2.3.5 executable?  I don't want to do that.  Instead, I'd like
> > > to keep both versions of Rails.  Can anyone help?
>
> > > Thanks.
>
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