Have you tried the Engineering Puzzles found on Facebook ? You not only need to solve the puzzle but you will also need to decode the e-mail address ({0xFACEB00C>>2 in decimal}@fb.com) that is used for the submission of the answers for the various puzzles.

'which' is a Unix command used to identify the location of executables by searching in the directories listed in the PATH environment variable.

Netcat is often known as the swiff army knife for TCP/IP. It’s features include but not limited to UDP/TCP port scanning, file transfers, tunneling of UDP over TCP, port forwarding and so on.

IP routing or IP forwarding is the process of routing packets between the network interfaces on a system with routing capabilities. While routing is usually the job of a network router, a server running on any recent version of UNIX can perform this action as well.

Have you ever come across the error message “The terminal server has exceeded the maximum number of allowed connections” while trying to login to a Windows machine as an administrator?

There are a number of sites that disable the right-mouse clicks to with the intention to prevent the theft of their web page content. A no right click restriction is implemented by manipulating the event objects in JavaScript.

Are you bored with your typical screen saver? If yes, read on…

If you are not aware yet, every Facebook account has a privacy option to block users based on their name or e-mail address. Once you block someone, you cut all ties with them, including friendship, comments, etc. They will not be able to interact with you nor be able to search for you on Facebook.

I have recently discovered a new Windows command line tool, called 'clip' that can be used to redirect the output of CLI tools to the Windows Clipboard.