zsh だったので、ちょっぴりはまったので備忘録的な何か
homebrew install
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install rbenv ruby-build
echo 'if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi' >> ~/.zshrc
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.zshrc
install rbenv
brew install rbenv
Install Ruby
rbenv install 2.2.3
rbenv global 2.2.3
ruby -v
gem install rails -v 4.2.4
こんな感じ。.rbanv/binへのpathを忘れてたという凡ミスでしたな