Simple example of using the RVM Ruby API

gistfile1.txt

#
# NOTE: You may require ~/.rvm/lib/rvm after adding ~/.rvm/lib to the load path $:
#       OR 'gem install rvm' and require the RVM API as a gem!
#
require "rvm"

results = []

#
# Iterate over an RVM Environment object for each interpreter
# NOTE: to use gemset simply use "1.9.2@gemsetname" for example.
#
RVM.environments("1.8.7","1.9.2").each do |environment| 

  # Collect the standard output of each ruby command run,
  results << environment.ruby("test.rb").stdout

end

# Now iterate printing a nice and purty output
results.each do |result| 
  puts "=" * 80
  puts result
  puts "=" * 80
  puts
end