Ben's guide to painless ruby switching with chruby

gistfile1.txt

1) Latest brews.
$ brew update

2) Install packages.
$ brew install chruby ruby-install selecta

3) Load chruby when the shell inits.
echo >> ~/.zshrc
if [ -d /usr/local/opt/chruby ]; then
  . /usr/local/opt/chruby/share/chruby/chruby.sh
  . /usr/local/opt/chruby/share/chruby/auto.sh
fi

5) Build as many rubies as you like:
$ ruby-install # List installable rubies
$ time ruby-install ruby 2.1.0
$ time ruby-install ruby 1.9.3-p484

6) Choose a default ruby:
echo $(ls -1 ~/.rubies | selecta) > ~/.ruby-version

7) Restart shell

8) Choose a directory-specific ruby:
echo $(ls -1 ~/.rubies | selecta) > ./.ruby-version
cd ..
cd -