netstat show process listening on port code example
Example 1: ubuntu check process on port
sudo lsof -i:22
Example 2: find out which procses is using port linux
sudo lsof -i:<port_number>
Example 3: cli check what is listening on port
lsof -i tcp:53 #Check what is listening on port 53
lsof -t -i tcp:53 #Return the process PID listening on port 53