ubuntu check process on port
sudo lsof -i:22
check services running on port linux
one of those:
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
check if service in running to a port in linux
sudo lsof -i -P -n | grep LISTEN
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