指令

sudo lsof -i :端口号

案例一

% sudo lsof -i :80
Password:
COMMAND    PID   USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
httpd      314   root    4u  IPv6 0xfd2222a5a53fcf99      0t0  TCP *:http (LISTEN)
BaiduNetd  569 jiqing   95u  IPv4 0xfd2222a5abe39b81      0t0  TCP 192.168.2.28:51132->220.181.43.8:http (ESTABLISHED)
WeChat     571 jiqing   45u  IPv6 0xfd2222a5a53fdc59      0t0  TCP 192.168.2.28:50849->101.91.37.36:http (ESTABLISHED)
httpd      950   _www    4u  IPv6 0xfd2222a5a53fcf99      0t0  TCP *:http (LISTEN)
httpd     1509   _www    4u  IPv6 0xfd2222a5a53fcf99      0t0  TCP *:http (LISTEN)
httpd     1510   _www    4u  IPv6 0xfd2222a5a53fcf99      0t0  TCP *:http (LISTEN)
httpd     1511   _www    4u  IPv6 0xfd2222a5a53fcf99      0t0  TCP *:http (LISTEN)

案例二

 sudo lsof -i :8080
COMMAND  PID   USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
nginx   1775   root    6u  IPv4 0xfd2222a5abd8b361      0t0  TCP *:http-alt (LISTEN)
nginx   1776 nobody    6u  IPv4 0xfd2222a5abd8b361      0t0  TCP *:http-alt (LISTEN)

httpd是apache进程，nginx是nginx进程。

80端口被apache使用了，8080端口被nginx使用。