rbl: Ruby Locator
rbl is a dead simple ruby version manager that is inspired by nodebrew
$ curl -L https://github.com/uu59/rbl/raw/master/rbl | sh
$ echo 'export PATH="$HOME/.rbl/current/bin:$PATH"' >> ~/.bash_profile
Or,
$ curl -Lo rbl https://github.com/uu59/rbl/raw/master/rbl
$ chmod +x ./rbl
$ ./rbl install