Minecraft wiki entry for Create_a_Mac_OS_X_startup_daemon, associated text: Tip for the astute reader: Instead of doing a chown once in the previous step, and a chown at this step, it's quicker to simply move the folder, and chown -R the resulting folder. One less command. The reason why it is recommended to do it twice is to make sure your User and Group are properly created in the previous step. But no reason.