What are the Best Tips & Tricks & commands you know about windows power-shell & CMD ?

Asking about command lines for CMD and power shell is like asking me to count how many drops in the ocean,  but here's the thing.. actually, u can ask the command prompet himself by specific keys about what u want to know and the same deal in powershell for example i want to close the firewall using cmd the comman line is :netsh firewall set opmode disable. but i don't really remember so what i'm about to do is typing netsh /? then will give u te whole command that starts with netsh i hope this will help u and the last tip is try to understand command lines not to memorize it.

Sorry, i don't know .......

Here are the10 cool things you can do with Windows and PowerShell

http://www.techrepublic.com/blog/10-things/10-cool-things-you-can-do-with-windows-powershell/

However if you need anything specific do let me know i'll try to find out for you.