UNIX Tool Building

Illustrated Boards. Very Fine/No Jacket. Hardback. 4to - over 9¾" - 12" tall. 221 pages; a 7 p. index; Bibliographical references; book is on acid-free paper; from the Introduction: "The purpose of this book is to teach UNIX tool building by taking the reader through all facets of the design and implementation of a large, complete program. This book shows the reader the step-by-step development of 'watcher,' a complete UNIX tool whose function is detailed later." From the (c) page, it is not clear to me how this copy is to be classified, edition-wise; there are editions of this book published by Academic Press in San Diego (c) 1991, and the Academic Press U.K. Edition in London (no date given). Below, in Cataloging-in-Publication data paragraph, 1990 is given as the book's date. My guess is that the U.K. book was published in 1990, and this book is the 2nd printing of the first ediltion, or a First American edition.