Mac users who have long been at the mercy of arcane permissions from Mac OS X’s Unix underpinnings can now regain mastery of their Macs with “Take Control of Permissions in Leopard,” the latest Leopard-specific title in the Take Control library. Written by Unix guru and Mac aficionado Brian Tanaka, the 87-page ebook mixes practical how-to details and troubleshooting tips with just the right amount of theory as it explains permissions in relation to how you keep your files private, copy files to and from servers effectively, set the Ignore Permissions option for external disks, repair screwy permissions, and delete those files that just won’t die. The ebook may be purchased for US$10.