GNU screen

screen使用入門：
http://gnailuy.com/2011/07/23/gnu-screen%E4%BD%BF%E7%94%A8%E5%85%A5%E9%97%A8/
http://blog.longwin.com.tw/2005/11/screen_teach_for_use/

給screen下指令的方式：
bound to a key, invoked from a screenrc file, or called from the colon prompt
http://www.math.utah.edu/docs/info/screen_4.html#SEC4

screen畫面會閃爍的原因：visual bell

screen支援utf8的方法：
screen -U
(在existing session下執行這個指令沒用。This does not work when attaching to an existing session, you need to start a new session.)