使用控制字符解析字符串，例如：退格键，光标移动

Data stream from ssh server, has some special char, like backspace, cursor move, When I write it to file, then cat it,

  $ cat /tmp/cmd.text
  ifconfig

Then I use vim Open it, I get

  $ vim /tmp/cmd.text
  whoa^H^[[Kami^H^[[K^H^[[K^H^[[K^H^[[K^H^[[K^H^[[Kifconfig

How can I parse these string ?