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You don't have to run them as root. You can run them as a regular user. I'm pretty sure Wayne recommends against RVM system-wide and the preferred method is just installing it for individual users.

Root? I don't think I've ever run RVM as root. Why does it need to? Not saying you're wrong, I just don't know what you're referring to.

login as regular user, download some version of ruby, compile for use as logged in user, install rvm, shazzam install any version of ruby you want - all of this only applies to the logged in user and has zero impact on the rest of the system. RVM rules :)

I no longer install ruby at a system level, not needed, only users running ruby stuff need ruby installed and never use distro ruby, creates all sorts of issues...