gistfile1.rb

while out_open || err_open
  next unless ready = IO.select([out_pipe], [err_pipe], nil, Ticks)

  if ready.flatten.include?(out_pipe)
    out_open = (output.write(out_pipe.readpartial(BlockSize - 2)) rescue false)
  end

  if ready.flatten.include?(err_pipe)
    err_open = (errors.write(err_pipe.readpartial(BlockSize - 2)) rescue false)
  end

  puts 'out: %6s | err %6s' % [out_open, err_open]
end