Reflection Ruby

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  4. Convert all system command to all class method
class CommandWrapper
  def method_missing(method, *args)
    system(method.to_s, *args)
  end
end
cw = CommandWrapper.new
cw.date                   # Sat Apr 28 22:50:11 CDT 2001
cw.du '-s', '/tmp'        # 166749  /tmp