Learn Linux, 101: Maintain the integrity of filesystems

Learn Linux, 101: Maintain the integrity of filesystems: "Learn how to check the integrity of your Linux® filesystems, monitor free space, and fix simple problems. Use the material in this article to study for the Linux Professional Institute (LPI) 101 exam for Linux system administrator certification—or just to check your filesystems and keep them in good working order, especially after a system crash or power loss."