Apple systems are actually Unix-based, which means that numerous features that you find in a Linux OS are also present in Mac OS X. This is also true for various commands that can be used in a terminal.
Very few Mac OS X users know what the true origin of their operating system is and it's likely that they don't even care. The operating system is using a lot of technologies and a few ones are from FreeBSD and NetBSD. Because it's Unix-based, it also shares some features with Linux systems.
This is one of the reasons games that have already been released for Mac OS X are much easier to port to Linux than a title developed exclusively for the Windows platform. It also means that you can mess with some of the Mac OS X users, just like you can see in the attached image.
"Improve" (destroy) the Mac OS X with a few system commands
Just like Linux and Windows, Mac OS X also has a terminal. It's a very powerful tool that can be used both with good and bad intentions. In Windows, for example, the terminal (cmd) has a little too much power and regular users can do some nasty stuff.
The Mac OS X system is not as open as Windows and there are very few things that you can actually do from a terminal, if you are not the administrator. If you are an admin but you don't know what you are doing, this message that was posted on Google+ this week might do a lot of harm, although it's quite funny.
Most operating systems, including Linux and Mac OS X, start to respond slower after having been installed and used for a long time, so someone decided to take advantage of the users’ naiveté and posted a "helpful" command to make the system work better.
Users were instructed to open the terminal and enter a single command, which would make the system faster:
So, if you think that you can make your system faster with just one command, on Linux or Mac OS X for that matter, you should think again.