lets say that i run netstat -tanpu which gives an output of :

netstat -tanpu
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:5037          0.0.0.0:*               LISTEN      4425/adb
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      -
tcp        1      0 10.0.1.222:58665        173.236.188.101:80      CLOSE_WAIT  26979/chromium-brow
tcp        0      0 10.0.1.222:34104        64.12.30.16:443         ESTABLISHED 27207/pidgin
tcp        0      0 10.0.1.222:40856        74.125.226.152:443      ESTABLISHED 26979/chromium-brow
tcp      960      0 10.0.1.222:50400        10.0.1.26:139           ESTABLISHED 11575/gvfsd-smb-bro
tcp        0      0 10.0.1.222:42265        10.0.1.26:22            ESTABLISHED 20677/ssh
tcp        0      0 10.0.1.222:45574        10.0.1.34:22            ESTABLISHED 25819/ssh
tcp        0      0 10.0.1.222:51090        74.125.115.125:5222     ESTABLISHED 27207/pidgin
tcp        0      0 10.0.1.222:33447        74.125.226.139:80       ESTABLISHED 26979/chromium-brow
tcp        0      0 10.0.1.222:51092        74.125.115.125:5222     ESTABLISHED 27207/pidgin
tcp        0      0 10.0.1.222:39939        64.12.29.7:443          ESTABLISHED 27207/pidgin
tcp        0      0 10.0.1.222:44759        74.125.226.143:80       ESTABLISHED 26979/chromium-brow
tcp        0      0 10.0.1.222:54976        10.0.1.34:22            ESTABLISHED 20201/ssh
tcp      944      0 10.0.1.222:52363        10.0.1.26:445           ESTABLISHED 11721/gvfsd-smb
tcp        0      0 10.0.1.222:51021        74.125.115.125:5222     ESTABLISHED 26979/chromium-brow
tcp6       0      0 :::22                   :::*                    LISTEN      -
tcp6       0      0 ::1:631                 :::*                    LISTEN      -
udp        0      0 0.0.0.0:68              0.0.0.0:*                           -
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           -
udp        0      0 0.0.0.0:51118           0.0.0.0:*                           -
udp6       0      0 :::44099                :::*                                -
udp6       0      0 :::5353                 :::*                                -

but all i care about is where Local Address is listening on port 22 (4th column), lets make it a tad easier now:

netstat -tanpu | awk '{if ($4 ~ /:22$/){print}}'
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -
tcp6       0      0 :::22                   :::*                    LISTEN      -

here is the command line : netstat -tanpu | awk '{if ($4 ~ /:22$/){print}}'

some simple awk magic to output only the lines that match the regex (if column 4 matches :22 then print the whole line).

can be easily changed for your own fun and amusement.