multi_io.rb

class MultiIO
  def initialize(*targets)
    @targets = targets.map{ |t|t.is_a?(String) ? open(t, 'a') : t }
  end
 
  def write(*args)
    @targets.each{ |t| t.write(*args) }
  end
 
  def close
    @targets.each(&:close)
  end
 
  def puts(*args)
    @targets.each{ |t| t.puts(*args) }
  end
 
  def tty?
    @targets.all?(&:tty?)
  end
end