1. install tmux in ubuntu
   ~$ sudo add-apt-repository ppa:pi-rho/dev ~$ sudo apt-get update ~$ sudo apt-get install tmux

2. tmux basic usage
   ~$ tmux ~$ tmux -V # check version info.

to split the window in “left:right”, just type:

~$ CTRL B %

to split the window in “top:bottom”, just type:

~$ CTRL B "

to change the current working pane, just type:

~$ CTRL b <directory arrow> # up, down, left, right

to toggle the current working pane full-screen, just type:

~$ CTRL+b z

to create a new tmux window, just type:

~$ CTRL+b c

to toggle with the windows created by tmux, just type:

~$ CTRL+b <window_number> # 0, 1, 2, ...., 9

move to the (n)ext window:
~$ Ctrl+b n

move to the (p)revious window:
Ctrl+b p

Ctrl+B 然后在按 "w"，然后使用箭头来移动到你需要的会话，然后在回车，就可以切换到相应的会话中

要从会话脱离，可以按下 Ctrl+B 后接着按 "d" 。将脱离所有的会话返回原来的终端屏幕。
如果要恢复脱离的会话，您可以输入如下命令来恢复：
[root@server ~]# tmux attach