lsof command 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: lsof port
$ lsof -i :port
# ex. lsof -i :3000
sudo lsof -i:22
sudo lsof -i:<port_number>
$ lsof -i :port
# ex. lsof -i :3000