UNIX Shell Objects

Overview

Bring the power and flexibility of object-oriented programming to the Korn shell. Using real-world examples - including a complete Web site that acts as a distributed front-end for a full-system management utility - UNIX Shell Objects shows you how to break the mold of traditional shell programming and use a shell-based Object Request Broker to create multitiered, distributed-object applications that bridge networks and platforms.
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Overview

Bring the power and flexibility of object-oriented programming to the Korn shell. Using real-world examples - including a complete Web site that acts as a distributed front-end for a full-system management utility - UNIX Shell Objects shows you how to break the mold of traditional shell programming and use a shell-based Object Request Broker to create multitiered, distributed-object applications that bridge networks and platforms.
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Editorial Reviews

Elizabeth Zinkann

The traditional roles of shell programming include automating repetitive tasks or demonstrating a temporary prototype. In the latter case, if the shell program works well, it is implemented in a compiled language. Because the shell is an interpreted language, its execution time is slower than any compiled-language counterpart. In addition, if the program uses any call to other shell utilities, such as awk, the execution time is even slower. However, with the evolution of object-oriented programming, distributed computing practices, and many web interface and programming developments, the shell has become more useful. In the preface to UNIX Shell Objects, Jones says of the expansion, "the next generation of system development bridges multiple tiers across the network, thus connecting new and existing systems into large distributed applications." The enormity of this concept becomes clearer as the author connects the chapters. The "simple" shell links to object-oriented programming and design; it also bonds to Java to implement Internet sockets, which in turn permits IPC (interprocess communications). He also associates the shell with an object request broker (ORB), a system management utility (SMU), and CGI (Common Gateway Interface) programming. In many ways, it resembles the small country road developing into a central superhighway.

Jones reviews the fundamentals of object-oriented and shell programming in the first chapter, "The Nature of Object-Oriented Programming," and chapter two, "The Shell as a User and Programming." In chapters three through five he explains, in aptly-titled chapters, "The Syntax of Writing Classes," "Using Shell Objects," and "Object Communication." The subsequent chapter discussions feature Java, networking components, sockets, API, and distributed objects. Specifically, they describe "Using Java from the Shell," "Encapsulating the Network with Components," "Distributed Objects," and "Designing an Object-Oriented System." The concluding chapters illustrate "Creating a Shell-Based Distributed Application," "Rethinking an Object-Oriented System," "Using Shell Objects with CGI," and "Connecting from the Web." The appendices contain the GNU General Public License and information about the CD-ROM, followed by the index, the End User License Agreement, and the CD-ROM installation instructions. The CD-ROM includes code from the book, the Apache Web Server v. 1.2.6, and v. 5.2.12 of the public domain Korn Shell (pdKsh). It also contains a standard ORB installation.

UNIX Shell Objects exemplifies a multifunctional book. Jones begins with object-oriented and shell programming essentials and incrementally progresses to a distributed operating-system environment. Initially, he presents review chapters for both general shell programming and object-oriented design topics. They also can serve as basic introductory material for the novice. The author then illustrates how to create objects within the shell and reuse them. This concept permits the programmer greater flexibility and prevents repetitive implementations. With the use of Java's API, a shell programmer can create Internet sockets accessible through named pipes and establish communication between scripts. The introduction and utilization of an object request broker (ORB) that processes communication requests from a client also establishes the foundation for a project application for the user and reader to build. The System Management Utility (SMU) provides system administration from the creation of the ORB to the design of an HTML interface for the application.

This book builds upon each new concept and interface as they are defined and discussed. The number of design issues and technologies that Jones not only mentions, but also proceeds to develop, is remarkable and enlightening. He progresses from one topic to the next implementation seamlessly and proficiently. The author demonstrates how easily one advancement can encourage the inclusion of another. The format of the book is excellent and characterized by a readable, well-organized style. UNIX Shell Objects is a valuable tutorial and resource, characterized by its sophisticated subject matter and realistic, easy-to-read approach.
Electronic Review of Computer Books

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Product Details

  • ISBN-13: 9780764570049
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 7/1/1998
  • Edition description: BK&CD ROM
  • Edition number: 1
  • Pages: 456
  • Product dimensions: 7.04 (w) x 9.02 (h) x 1.29 (d)

Table of Contents

Preface
Acknowledgments
Ch. 1 The Nature of Object-Oriented Programming 1
Ch. 2 The Shell as a User and Programming Environment 19
Ch. 3 The Syntax of Writing Classes 47
Ch. 4 Using Shell Objects 79
Ch. 5 Object Communication 111
Ch. 6 Using Java from the Shell 139
Ch. 7 Encapsulating the Network with Components 161
Ch. 8 Distributed Objects 191
Ch. 9 Designing an Object-Oriented System 231
Ch. 10 Creating a Shell-Based Distributed Application 253
Ch. 11 Rethinking an Object-Oriented System 287
Ch. 12 Using Shell Objects with CGI 323
Ch. 13 Connecting from the Web 357
App. A: GNU General Public License 389
App. B: About the CD-ROM 397
Index 401
End-User License Agreement 430
CD-ROM Installation Instructions 436
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