http://superuser.com/questions/359723/mac-os-x-equivalent-of-the-ubuntu-tree-command
iterm 使用
http://www.cnblogs.com/noTice520/p/3190529.html
常用命令
http://aimijia.net/2014/05/each-mac-os-x-command-line-users-should-be-aware-of-the-eight-terminal-tool/