ss 是一个类似 netstat 的网络连接查看工具，man page 是这么说的
ss – another utility to investigate sockets
而 netstat 的 man page 中也有说到
This program is obsolete. Replacement for netstat is ss.
常用命令有
-s 参数，打印 summary
# ss -s Total: 1596 (kernel 1890) TCP: 7587 (estab 718, closed 6800, orphaned 0, synrecv 0, timewait 6779/0), ports 7376 Transport Total IP IPv6 * 1890 - - RAW 0 0 0 UDP 420 420 0 TCP 787 787 0 INET 1207 1207 0 FRAG 0 0 0
-p 参数，打印 process name
# ss -p |head
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 10.198.17.218:20869 10.133.33.10:9092 users:(("xxx",32492,37))
ESTAB 0 0 10.198.17.218:32516 10.231.139.30:8886 users:(("xxx",19706,17))
ESTAB 0 0 10.198.17.218:50831 10.208.146.112:31415 users:(("xx",1559,40))
ESTAB 0 0 10.198.17.218:26957 10.177.141.160:8886 users:(("xxx",1056,27))
ESTAB 0 0 10.198.17.218:56118 10.238.18.176:56328 users:(("xx",7491,19))
ESTAB 0 0 10.198.17.218:29310 10.177.130.230:6900 users:(("xxx",19715,14))
ESTAB 0 0 10.198.17.218:31249 10.209.0.153:8886 users:(("xxx",1052,29))
ESTAB 0 0 10.198.17.218:21980 10.241.90.225:50000 users:(("xxx",9211,39))
ESTAB 0 0 10.198.17.218:2452 10.177.154.166:10010 users:(("xxx",7875,24))