AppleJack is a different kind of utility -- it's one that you'll probably only use when you're in a real bind, say with a Mac that crashes every time you login. In such cases, the usual advice is to boot off the installer disk, and use the various tools available there to try to fix the problem.

But what if you're traveling with your laptop, and you don't happen to have your install disk with you? Enter AppleJack, which runs only in single user mode (Command-S at startup). In its basic mode, AppleJack does five things (either as a group, or one by one): repair disks, repair permissions, clean up cache files, validate preference files, and remove swap files. You access these tasks through a text-based men...
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