installing rails stuck?

I am trying to installing rails on Lion but after the command

sudo gem install rails --version 3.0.1

It asks me for password, I entered password the cursor moves to next line and then nothing happens. W开发者_运维百科hats wrong?

Successfully installed rails-3.0.1
1 gem installed
Installing ri documentation for rails-3.0.1...
File not found: lib

It's difficult to tell what's wrong from your description to the problem. However, using system default gem command is not encouraged, you will want to use rvm.