Download Mastering the AS/400 Control Language By George Lin
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Mastering the AS/400 Control Language By George Lin
Download Mastering the AS/400 Control Language By George Lin
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- Sales Rank: #4354949 in Books
- Published on: 1995-12-13
- Original language: English
- Number of items: 1
- Dimensions: .64" h x 8.29" w x 10.86" l,
- Binding: Textbook Binding
- 432 pages
From the Back Cover
The AS/400 Control Language (CL) is a set of commands that provide the primary interface between users and the system. Collectively, CL has more than a thousand commands, each of which is designed to perform a specific system, operational, or programming task. This book is a complete tutorial and easy-to-use reference for the AS/400 control language, together with AS/400: SYSTEM, UTILITIES, DATABASE AND PROGRAMMING by Lin & Stewart, it forms a complete tutorial and reference package for the AS/400. Covers CL commands, CL programming fundamentals, CL programming elements, calling programs and processing files, and advanced topics, such as sending messages and debugging programs. For AS/400 programmers and end users.
Excerpt. © Reprinted by permission. All rights reserved.
Preface Like most other control languages, such as Job Control Language (JCL) on the mainframe and DOS and OS/2 commands on a PC, the AS/400 Control Language (CL) provides a vital link between the system and users. AS/400 CL controls system operations, submits and controls jobs, facilitates application programming development, runs programs, processes database files, and performs system administration. Nearly everything you do on the AS/400 requires CL. A solid knowledge of CL is a prerequisite for all AS/400 professionals and users.
AS/400 CL offers a set of predefined CL commands that can be entered individually to perform certain functions. In addition, these commands can also be coded and grouped together as CL programs. Users c an incorporate logic, variables, expressions, operators, and control structures into CL programs in a way that is similar to the coding and use of high-level languages such as COBOL, RPG, and C. AS/400 CL is truly unique in its versatility and flexi bility. It combines the functionality and strengths of various operating system commands, job control languages, and high-level programming languages. Mastering AS/400 CL requires the learning of two main topics: CL commands and CL programming. This book first introduces the fundamental concept and structure of CL commands. Discussion of more complex and advanced topics of CL programming follows. Other important subjects, which include command entry, command prompting, major command groups, comm and driver, Source Entry Utility (SEU), Programming Development Manager (PDM), calling and running programs, passing parameters, processing files, working with data areas, working with objects, libraries, and the library list, processing jobs, monito ring messages, and debugging programs, are also discussed. All of these topics are essential to full utilization of AS/400 CL. In This Book this book is distinct in its breadth, depth, and ease of use. It employs a combination of text, tutorials, and lab exercises to engage readers in hands-on study. Detailed and step-by-step illustrations and instructions using displays, tables, diagrams, and examples are employed throughout the book. Chapters of this book are organized into five major parts:
CL Commands: Part 1 introduces the AS/400 CL commands. It introduces the basic syntax and structure of a command. It also shows readers how and where to enter CL commands by using free-form entry and command prompting. In addition, it presents two important features: major command groups and the command driver. These two features, coupled with the use of command prompting and Help text, are essentially the keys to mastering AS/400 CL. Tutorials, examples, and lab exercises are used t o illustrate the AS/400 environment and to teach the use and entry of AS/400 CL commands. CL Programming Fundamentals Part 2 discusses the fundamentals of CL programming, including the functions and structure of CL programs. It also teaches readers how to use the AS/400 utilities, Source Entry Utility (SEU) and Programming Development Manager (PDM), and how to enter and compile CL programs.
In each chapter, tutorials, screen displays, examples, and lab exercises are used to maximize the reader's learning experience. CL Programming Elements Part 3 addresses the essential elements that form CL programs. These elements include CL variables, expressions, operators, built-in functions, and control structures. Professional programming examples, tutorials, and lab exercises are employed to assist readers in coding and developing practical CL programs. Calling Programs and Processing Files Part 4 discusses some of the most important functions of AS/400 CL: calling programs, passing paramete rs to called programs, submitting jobs, processing database files, and running interactive CL programs using display files. Charts and diagrams are used to illustrate the flow of active programs in a program stack when programs are called and control s are transferred.
Readers can practice CL program coding and gain practical knowledge through various CL program examples and lab exercises. Advanced Topics Part 5 provides an advanced guide that assists readers as they hone their CL knowledge and skills. Tutorials, examples, and step-by-step instructions walk readers through using some of the advanced CL features. They include working with data areas, working with objects, libraries, and the library list, processing jobs under work management, monitoring messages, and testing and debugging programs. Who Can Use This Book This is a technical book written for both novice and experienced information systems professionals. AS/400 users and students can use this book to acquire basic and intermediate knowledge of AS/400 CL commands and CL programming.
Programmers, operators, system analysts, and system administrators can use this book as a technical reference. Both beginning and experienced computer professionals will benefit from th e detailed hands-on tutorials, graphical screen illustrations, step-by-step instructions, and lab exercises. The structured tutorials and practical knowledge offered by this book make it ideal for self-study, as well as classroom teaching and learning.
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