UNIX Operating System

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Overview
Unlike many operating systems, UNIX is not limited to specific computers using a particular microprocessor as a CPU. Instead, UNIX systems run on all sizes of computers using a wide range of microprocessors. In addition, current versions of many other operating systems have been revised to include the capability to run UNIX applications and connect smoothly with UNIX networks.

Teaching Tips
Overview
1. Provide students with an overview of the UNIX operating system. Discuss the three major advantages: portability, powerful utilities, and device independence.
2. Point out the disadvantages of the UNIX operating system. Be sure to mention that there is no single, standardized version of this operating system and that the commands may seem cryptic to novice users.


History
1. Provide students with a brief overview of the history of the UNIX operating system. Use Table 13.1 on page 403 as a guide.

The Evolution of UNIX
1. Explain the evolution of the various UNIX operating systems. Include in your discussion the historical roots of UNIX, its features, and modifications.
2. Discuss the features of newer, more current releases of UNIX. Examples include full support for local area networks, compliance with international operating system standards, improved system security, and the Common Desktop Environment (CDE).

Memory Management

1. Point out that UNIX was originally designed for single users, but that it eventually developed into powerful operating systems for multiuser environments as well.
2. Explain memory management techniques used in UNIX operating systems, namely swapping and demand paging. Discuss their key features, situations in which they are used, and their pros and cons.