"In use" as in with an active connection, or that programs are listening on? Or both?
Run sudo netstat -lp in your terminal; this will tell you what ports are open to receive connections, and what programs are listening on them. Try sudo netstat -p for the same thing, plus currently-active connections.
"In use" as in with an active connection, or that programs are listening on? Or both?
Run
sudo netstat -lp
in your terminal; this will tell you what ports are open to receive connections, and what programs are listening on them. Trysudo netstat -p
for the same thing, plus currently-active connections.