Chapter 2. UNIX Migration Overview

This chapter starts to address the problems we described in Chapter 1. It explains how UNIX has evolved over the years and describes the major differences between versions of UNIX, while placing other operating systems into context. In addition, this chapter explains what the scope of a migration project should be.

This chapter contains the following sections:

• "Brief History of UNIX" on page 9

• "Comparison of Commercial and Derivative Versions of UNIX" on page 13