What is your computer listening to?

Ever wondered what your computer is looking for. Some of these could be avenues for hackers to get into your machine. Actually this is looking for processes bound to specific ports.

Use the following command  to see wbat particular port your computer is listening for:

Terminal - Look for the process bound to a certain port:

sudo netstat -tulpn | grep :8080

Look for the process bound to a certain port 

Or you could look at all the ports to 1000;

$ cat portscan.sh
for i in {1..1000}
do
echo $i
sudo netstat -tulpn | grep :$i
done

$./portscan.sh > portscan.file

You might see something  like this in the file.

...

...

628
629
630
631
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      2217/cupsd
tcp6       0      0 ::1:631                 :::*                    LISTEN      2217/cupsd
632
633

...

...

Cups is the unix print mechanism, Something you might want to keep and eye on once in a while or less.