What am I missing here? Is this just a guide on how to use apt-get? Also I though the gem command automatically used a user specific directory when not run as root.
I use ruby-install and chruby. No runtime hacks or patching of cd. rvm and rbenv failed numerous times, ruby-install and chruby use env var manipulation only to accomplish ruby switching. (No gem sets but they don't really solve anything anyhow.)
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https://github.com/postmodern/chruby