1.tmux介绍
tmux是terminal multiplexer的缩写，这里multiplexer怎么翻译才好呢？
下面是英文介绍：
tmux is a terminal multiplexer：it enables a number of terminals to be created, accessed, and
controlled by from a single session。tmux may be detached from a screen and continue running
in the background, then later reattached.
when tmux is started it creates a new session with a single window and display it on screen. A
status line at the bottom of the screen shows information on the current session and is used to
enter interactive command.
A session is a single collection of pseudo terminals under the managment of tmux, Each session
has one or more windows linked to it. A window occupies the entire screen and may be split into
rectangular panes, each of which is a seperate pseudo terminal. Any number of tmux instances
may connect to a same session, and any number of windows may be present in the same session.
Once all sessions are killed, tmux exits.
2. tmux的安装
在ubuntu下，sudo apt-get install tmux。
也可以用源代码包进行安装，下载地址：http://tmux.sourceforge.net/