From: Tim Hunter <rmagick@...>
Date: 2006-05-26T21:03:57+09:00
Subject: Re: making 1.8.4 default

Bob Brander wrote:
> I've tried installing ruby 1.8.4 on my Mac OS X, but ruby 1.8.2 remains 
> my default. How do I make 1.8.4 my default?

Ruby 1.8.2 is installed in /usr/bin. Probably (if you took the defaults) 
you installed Ruby 1.8.4 in /usr/local/bin. OS X uses the $PATH 
environment variable to establish a list of directories to search for 
commands. It searches the list in order. It will use the first ruby 
executable that it finds in that list. So, you need to change your $PATH 
to put /usr/local/bin (or whatever directory you installed Ruby 1.8.4 
in) in front of /usr/bin. To see what your current $PATH is, open a 
terminal window and type

echo $PATH

To put /usr/local/bin in front of /usr/bin, type

export PATH=/usr/local/bin:$PATH

Now type "ruby -v" to make sure that you get 1.8.4.

To make the change permanent you'll have to add the "export" command 
above to a startup file like .bashrc. You can read about .bashrc by 
reading the bash man page.

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