TidBITS Electronic Publishing today announced the release of “Take Control of Permissions in Mac OS X,” by Brian Tanaka. The 90-page book “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 book covers managing permissions from the Finder’s Get Info and Inspector windows, with more-capable Macintosh utilities, and from the Unix command line. “Take Control of Permissions in Mac OS X” is priced at US$10.