What is the easiest way for me to instruct Ruby to use the new version of Ruby?
I suppose you mean, "What is the easiest way for me to tell Textmate to use a newer version of Ruby?"
, , TM_RUBY, ? , , - /usr/local ( , /usr/local/bin/ruby ).
, :
$ which ruby
/usr/local/bin/ruby
,
$ ruby -v
ruby, Textmate, "" TM_RUBY 1.9.2.