ss命令: 显示Linux的TCP / UDP连接的信息网络和Socket

列出当前socket详细信息:
[root@www ~]# ss -s
Total: 1372 (kernel 1503)
TCP:   1896 (estab 1192, closed 379, orphaned 319, synrecv 0, timewait 379/0), ports 215

Transport Total     IP        IPv6
*      1503      -         -       
RAW      0         0         0       
UDP      0         0         0       
TCP      1517      1517      0       
INET      1517      1517      0       
FRAG      0         0         0       

显示所有打开的网络端口
[root@www ~]# ss -l
Recv-Q Send-Q                                          Local Address:Port                                              Peer Address:Port  
0      0                                                   127.0.0.1:9000                                                         *:*      
0      0                                                           *:mysql                                                        *:*      
0      0                                                           *:http                                                         *:*      
0      0                                                           *:ssh                                                          *:*

显示每个进程具体打开的socket
# ss -pl

显示所有的TCP Socket
#ss -t -a

显示所有的UDP Socekt
# ss -u -a

显示所有已建立的SMTP连接
# ss -o state established '( dport = :smtp or sport = :smtp )'

显示所有已建立的HTTP连接
# ss -o state established '( dport = :http or sport = :http )'

找出所有连接X服务器的进程
# ss -x src /tmp/.X11-unix/*

更详细请参照：