ubuntu check process on port
sudo lsof -i:22
find out which procses is using port linux
sudo lsof -i:<port_number>
check if port is running in ubuntu
# Any of the following
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # Port
sudo nmap -sTU -O IP-address-Here
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