Depraced, I switched to rvm.
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README
add_ruby_command
every_ruby
gem
install_ruby

README

Make sure you add this to your $PATH.

I usually place this in /opt/ruby/bin and recommend you to do so, too.
Or at least inside $RUBY_PREFIX/bin.
Should work otherwise, but I never tested that (and don't plan to)

You need to set those values in your .bashrc or somewhere:

RUBY_PATH (mine is /opt/ruby)
RUBY_VERSION (default ruby version, mine is 1.8.7)

Usage:

  install_ruby 1.8.7
  every_ruby -v
  gem install rails