proc/net/dev实时网速统计实例

https://blog.csdn.net/dosthing/article/details/80384541

http://www.l99.com/EditText_view.action?textId=635363

http://www.cnblogs.com/chengmo/archive/2010/10/09/1846826.html

http://www.361way.com/proc-awk-network/4971.html