Easily colorize console output in Ruby:

colorize.rb

class String
  # colorization
  def colorize(color_code)
    "\e[#{color_code}m#{self}\e[0m"
  end

  def red
    colorize(31)
  end

  def green
    colorize(32)
  end

  def yellow
    colorize(33)
  end

  def pink
    colorize(35)
  end
end

#
# How to use
#
puts "This is red".red
puts "This is green".green
puts "This is yellow".yellow