It's actually a bit in-depth for a simple admin command. A lot of the basic commands are done with essentials or plugins like it. Nice bumping a thread from a year ago though
I mean Mojang should have done it on their side by now since it is more complex. The problem with using a plug-in is as soon as an update happens everything falls apart. Then waiting for updates and reassemble.
In regards to the bumping I was looking for a solution and found this thread. They always say don't start a new thread if one already exists.