txt去重 http://man.linuxde.net/sort
Linux 脚本编写基础 http://www.cnblogs.com/linn/archive/2007/03/05/664739.html
http://blog.csdn.net/gzh0222/article/details/7530766
hostname修改http://www.centoscn.com/CentOS/config/2014/1031/4039.html
txt去重 http://man.linuxde.net/sort
Linux 脚本编写基础 http://www.cnblogs.com/linn/archive/2007/03/05/664739.html
http://blog.csdn.net/gzh0222/article/details/7530766
hostname修改http://www.centoscn.com/CentOS/config/2014/1031/4039.html