linux check which port is used by a process code example

Example 1: linux query port use by pid

$ sudo netstat -nlp | grep :80
tcp  0  0  0.0.0.0:80  0.0.0.0:*  LISTEN  125004/nginx

Example 2: linux check what process is using port

$ netstat -ltnp | grep -w ':80'

Example 3: ubuntu check process on port

sudo lsof -i:22

Example 4: linux which process is using a port

$ sudo netstat -ltnp | grep ':80'