How to find if a port is in use on Linux/Unix

You can use the two below commands to figure out if a particular port is in use on a Unix/Linux box:

sudo netstat -tulpn | grep [port_number]

Or you can also use the following expanded command:

sudo netstat --all --programs --numeric-ports | grep [port_number]

If these commands return something, then the port is definitely in use. You could also use the above commands without sudo but then you might not get all the details of the process that is using the port.

Android Apps for 25cents

To celebrate 25 billion app downloads, Google Play (App Store) is offering great apps at a discounted price of $0.25 each. Check out the apps here. You can also read more on the office blog here.
Keep an eye on the play store, as they also plan to:

offer some special collections like 25 movies you must own, 25 banned books, 25 albums that changed the world and our 25 top selling magazines, all at special prices