1.  Introduction

      ADB is a new debugging program that is available on UNIX. It provides capabilities to look at ``core'' files resulting from aborted programs, print output in a variety of formats, patch files, and run programs with embedded breakpoints. This document provides examples of the more useful features of ADB. The reader is expected to be familiar with the basic commands on UNIXwith the C language, and with References 1, 2 and 3.