ubuntu@ubuntu:~$ sudo lsof -i :22
ubuntu@ubuntu:~$ sudo lsof -i
COMMAND     PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
avahi-dae  1272  avahi   13u  IPv4  10988      0t0  UDP *:mdns
avahi-dae  1272  avahi   14u  IPv6  10989      0t0  UDP *:mdns
avahi-dae  1272  avahi   15u  IPv4  10990      0t0  UDP *:44848
avahi-dae  1272  avahi   16u  IPv6  10991      0t0  UDP *:48746
cupsd      1404   root   10u  IPv6  13862      0t0  TCP ip6-localhost:ipp (LISTEN)
cupsd      1404   root   11u  IPv4  13863      0t0  TCP localhost:ipp (LISTEN)
ubuntu-ge  5108 ubuntu   11u  IPv4 306831      0t0  TCP ubuntu.local:43883->mistletoe.canonical.com:http (CLOSE_WAIT)
unity-sho  5175 ubuntu   10u  IPv4 182924      0t0  TCP ubuntu.local:43482->71.92.189.91.lgw-01.prodstack.canonical.com:https (CLOSE_WAIT)
gvfsd-htt  5869 ubuntu   12u  IPv4 183483      0t0  TCP ubuntu.local:40926->LB260.LOND.COTENDO.net:http (CLOSE_WAIT)
gvfsd-htt  5869 ubuntu   13u  IPv4 183320      0t0  TCP ubuntu.local:40925->LB260.LOND.COTENDO.net:http (CLOSE_WAIT)
dnsmasq    5903 nobody    4u  IPv4  47355      0t0  UDP ubuntu:domain
dnsmasq    5903 nobody    5u  IPv4  47356      0t0  TCP ubuntu:domain (LISTEN)
firefox    6031 ubuntu   64u  IPv4 311502      0t0  TCP ubuntu.local:50381->rowling.freenode.net:http (ESTABLISHED)
firefox    6031 ubuntu   65u  IPv4 311535      0t0  TCP ubuntu.local:50382->rowling.freenode.net:http (ESTABLISHED)
firefox    6031 ubuntu   81u  IPv4 116473      0t0  TCP ubuntu.local:35970->69.59.197.29:http (ESTABLISHED)
dhclient  12110   root    6u  IPv4 306554      0t0  UDP *:bootpc
dhclient  12110   root   20u  IPv4 306544      0t0  UDP *:30865
dhclient  12110   root   21u  IPv6 306545      0t0  UDP *:46997
ubuntu@ubuntu:~$ sudo lsof -i :22
ubuntu@ubuntu:~$