centos check all the ports being used code example
Example 1: ubuntu check process on port
sudo lsof -i:22Example 2: linux how to see ports in use
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # see a specific port such as 22sudo lsof -i:22sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # see a specific port such as 22