How can I check whether a port in linux is occupied ?, Linuxport

How can I check whether a port in linux is occupied ?, Linuxport
I. Use lsof

Format:

Lsof-I: port

For example, to view port 80 usage, you can use lsof-I: 80.

It is clear that the port is occupied.

Remarks: Note that lsof must have the permissions of the process. You can view the usage information. For example, if I use another user, I cannot view it.

The current user named dequan cannot see the process usage. If you use nginx or root users, you can:

Ii. Use netstat

Format:

Netstat-anp | grepport

For example, you can view the 80 usage information as follows: