例如: 查看22端口现在运行的情况
# lsof -i :22
COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
sshd    1409 root    3u  IPv6   5678       TCP *:ssh (LISTEN)

lsof完整文档:
http://blog.csdn.net/guoguo1980/article/details/2324454

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