linux check what process is using port
$ sudo netstat -nlp | grep :80
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 125004/nginx
sudo lsof -i:22sudo lsof -i:<port_number>sudo ss -lptn 'sport = :80'$ netstat -ltnp | grep -w ':80'
lsof -i tcp:53 #Check what is listening on port 53
lsof -t -i tcp:53 #Return the process PID listening on port 53
Also in C++:
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