Move from RVM to RBEnv on OS X Yosemite

I’ve not been keeping up with the latest hotness, but it seems that RBEnv is now the defacto way to mange Ruby versions. To remove RVM and use RBEnv instead:

 $ rvm implode

Then remove ~/.rvm manually and delete anything rvm-related in ~/.bashrc and ~/.bash_profile

Assuming we already have brew installed:

 $ brew install rbenv ruby-build

Add rbenv to your .bash_profile

 $ echo 'if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi' >> ~/.bash_profile

Reload the bash profile

 $ source ~/.bash_profile

Install Ruby 2.2.1

 $ rbenv install 2.2.1

Set Ruby 2.2.1 as the systemwide default version (see rbenv docs)

 $ rbenv global 2.2.1

Check the version of Ruby:

 $ ruby -v

Sources: Stack Overflow and Rails guide to installing Ruby on Yosemite