Check port used in linux

If you want to see which process is using which port (in this case, port 53), you can do it with the following command:

# netstat -tulpn| grep :53

This gives the following output:

tcp        0      0 :::53                       :::*                        LISTEN      1234/named

As you can see, dns (named) is using port 53 on PID 1234.
You can also do it with other ports by replacing the number (53) by another port.
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