参考：https://stackoverflow.com/questions/49381124/what-are-the-differences-between-lsof-and-netstat-on-linux
https://www.cnblogs.com/pc-boke/articles/10012112.html

• LSOF: List of Open Files. It lists all the open files belonging to all active processes.
• NETSTAT: It is a tool to get the network statistics. By default, netstat displays a list of open sockets. If you don’t specify any address families, then the active sockets of all configured address families will be printed.
• examples:

sudo lsof -n -i
sudo lsof -n -i4
sudo lsof -n -i :80 
netstat -r 
netstat -plunt

• 1.netstat无权限控制，lsof有权限控制，只能看到本用户
  2.losf能看到pid和用户，可以找到哪个进程占用了这个端口
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