linux which process is using a port
$ sudo netstat -ltnp | grep ':80'
linux which process is using a port
$ sudo netstat -ltnp | grep ':80'
find out which procses is using port linux
sudo lsof -i:<port_number>
check application using port linux
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo ss -tulpn | grep LISTEN
sudo lsof -i:22 ## see a specific port such as 22 ##
sudo nmap -sTU -O IP-address-Here
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