ABSTRACT
We live in a computer age. We use computers and they help us, but we also rely on them. And the worthiest part of any computer is the data; data is priceless, and often irreplaceable. UNIX systems are no exception to this rule. In UNIX systems, data live in files, and files live in filesystems, so discussing data means discussing files and filesystems. Readers familiar with databases know that data may also live in database spaces other than filesystems.
