Chapter 2. Unix History and Lineage

This is a book about Unix security. But before we can really plunge into the topic of our book—security—we need to explore what we mean by this word "Unix." After that, we'll discuss how notions of computer security play out in the Unix world. Figure 2-1 shows the many Unix variants, and their relationships, that we'll describe in this chapter.

Figure 2-1. Unix variants