Ubuntu netstat command - howto keep it updating? -

i know there way run netstat command on ubuntu keeps updating. know? know when process opens or closes socket:

sudo netstat -lnp |grep 12239 

you can wrap command in watch, eg try

 watch -n 60 "sudo netstat | head 10" 

where use grep expression instead of head 10. updates every 60 seconds, see man watch.