“`
$ brew update
$ brew install readline ruby-build rbenv
$ echo ‘export PATH=”$HOME/.rbenv/bin:$PATH”‘ >> ~/.bash_profile
$ echo ‘eval “$(rbenv init -)”‘ >> ~/.bash_profile
$ exec $SHELL -l
$ rbenv install -l
$ rbenv install 2.0.0-p353
$ rbenv global
$ rbenv global 2.0.0-p353
$ rbenv global
$ ruby -v
“`
で `ruby 2.0.0p353 (2013-11-22 revision 43784) [x86_64-darwin12.5.0]` でたー