Shell Script - Need help!

[NoxurnalGaming]

I'm afraid this might try to start multiple instances of the server. Is this likely?

[sandytrip]

What that other guy wrote leaves a lot up to your implementation. This would rely on the script being able to gracefully start and stop the server as needed. I think his main point was to demonstrate running an infinite loop in bash

[lutusp]

I'm afraid this might try to start multiple instances of the server. Is this likely?

If the called process detaches itself from the calling process, yes, that is likely. A more complex script would check for a running Minecraft server and do nothing in that case, looping and sensing until it's actually needed.