linux check port used by process code example

Example 1: linux check what process is using port

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

Example 2: process runninng on particular port

sudo ss -lptn 'sport = :80'

Example 3: linux which process is using a port

$ sudo netstat -ltnp | grep ':80'

Example 4: check what ports are open linux

## if you use linux
sudo ss -tulw