Note: It's prefered to NOT use sudo to work with RVM gems. When you dosudo you are running commands as root, another user in another shelland hence all of the setup that RVM has done for you is ignored whilethe command runs under sudo (such things as GEM_HOME, etc...). So toreiterate, as soon as you 'sudo' you are running as the root systemuser which will clear out your environment as well as any files itcreates are not able to be modified by your user and will result instrange things happening.