Hi mistwang,
I have multiple rails instalations
Gem rails installed (via gem list)
rails (2.2.2, 2.1.2, 2.1.1, 2.1.0, 2.0.2, 1.2.3)
And with the command "whereis ruby" it returns:
ruby: /usr/bin/ruby /usr/bin/ruby1.8 /usr/lib/ruby /usr/lib64/ruby
Which configuration of the ruby did you...