# Any of the following
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # see a specific port such as 22
sudo nmap -sTU -O IP-address-Herenetstat -tulpnsudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # see a specific port such as 22# To check the listening ports and applications on Linux
# Use any of the following command on terminal
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:80 # see a specific port such as 80
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