linux下使用netstat和管道来获取服务端建立的ip连接数

linux下使用netstat和管道来获取服务端建立的ip连接数，以ss服务端（已建立的TCP连接、python）为例：

netstat -anp |grep 'ESTABLISHED' |grep 'python' |grep 'tcp'

附anp说明：

-a     Show  both  listening  and  non-listening (for TCP this means established connections) sockets.

-n     Show numerical addresses instead of trying to determine symbolic host, port or user names.

-p     Show the PID and name of the program to which each socket belongs.