The Ruby 2 prepend() method makes method chaining a lot easier.

gistfile1.rb

module SystemHook
  private
  def system(*args)
    super.tap do |result|
      puts "system(#{args.join(', ')}) returned #{result.inspect}"
    end
  end
end

class Object
  prepend SystemHook
end

system("date")
system("kangaroo", "-hop 10", "skippy")

Is there are any ability to access an old system method?