Find list of open ports / listening ports
lsof
Samples
# lsof -i -n -P
netstat
Samples
# netstat -tulpn
# netstat -a | egrep 'Proto|LISTEN'
# netstat -ao
Important netstat arguments
-n, --numeric don't resolve names - this one really saves time ;)
-e, --extend display other/more information
-p, --programs display PID/Program name for sockets
-l, --listening display listening server sockets
-t, --tcp tcp
-u, --udp udp
-a, --all, --listening display all sockets (default: connected)
-c, --continuous continuous listing
