First, you can use netstat -antup to find out all open ports, and then use grep to find out your pid. For example, your pid is 27 1 1. You can determine whether a process has an open port in the following ways:

netstat-antup | grep 27 1 1

If there is a result, it is probably like this:

TCP 0 0 192. 168. 122. 1:53 0.0 . 0.0:* listen 27 1 1/dnsmasq

53 in the fourth column above is the port number.

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