I'm reading through the RubyGems docs and found this:

Using RUBYOPT

By setting the RUBYOPT environment variable to the value rubygems, you 
tell Ruby to load RubyGems every time it starts up. This is similar to 
the -rubygems options above, but you only have to specify this once 
(rather than each time you run a Ruby script).

Unix users will want to put the following line in their .profile (or 
equivalent):
export RUBYOPT=rubygems

I'm new to unix.  I'm using ubuntu. How would I do this, do I really 
want to do this, and what exactly does it do?
Thanks Again. :)

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