things that can do linux but cant do in other os

Matthew Helmke posted an interesting article on his blog about stuff that is OK to do with Linux but it’s not OK while using Windows or even a Mac.
Among those are :

• Upgrade to the newest version legally and without paying money

• Have the latest version of the operating system run faster than the previous version on the same hardware

• Easily install and run different graphical interfaces if I don’t like the default setup

• Install twenty programs with one command

• Have the system automatically update all my installed programs for me.

• Install the same copy of my OS (Ubuntu) on multiple computers without worrying about license restrictions or activation keys