Arnold Robbins

Learning the Korn Shell (eBook, PDF)

• Format: PDF

Produktbeschreibung

The Korn shell is an interactive command and scripting language for accessing Unix and other computer systems. As a complete and high-level programming language in itself, it's been a favorite since it was developed in the mid 1980s by David G. Korn at AT&T Bell Laboratories. Knowing how to use it is an essential skill for serious Unix users. Learning the Korn Shell shows you how to use the Korn shell as a user interface and as a programming environment.Writing applications is often easier and quicker with Korn than with other high-level languages. Because of this, the Korn shell is the most often used shell in commercial environments and among inexperienced users. There are two other widely used shells, the Bourne shell and the C shell. The Korn shell, or ksh, has the best features of both, plus many new features of its own. ksh can do much to enhance productivity and the quality of a user's work, both in interacting with the system, and in programming. The new version, ksh93, has the functionality of other scripting languages such as awk, icon, Perl, rexx, and tcl.Learning the Korn Shell is the key to gaining control of the Korn shell and becoming adept at using it as an interactive command and scripting language. Prior programming experience is not required in order to understand the chapters on basic shell programming. Readers will learn how to write many applications more easily and quickly than with other high-level languages. In addition, readers will also learn about Unix utilities and the way the Unix operating system works in general. The authors maintain that you shouldn't have to be an internals expert to use and program the shell effectively.The second edition covers all the features of the current version of the Korn shell, including many new features not in earlier versions of ksh93, making it the most up-to-date reference available on the Korn shell. It compares the current version of the Korn shell to several other Bourne-compatible shells, including several Unix emulation environments for MS-DOS and Windows. In addition, it describes how to download and build ksh93 from source code.A solid offering for many years, this newly revised title inherits a long tradition of trust among computer professionals who want to learn or refine an essential skill.

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Produktdetails

• Verlag: O'Reilly Media
• Seitenzahl: 434
• Erscheinungstermin: 23. April 2002
• Englisch
• ISBN-13: 9781449371289
• Artikelnr.: 38485010

Autorenporträt

Arnold Robbins, an Atlanta native, is a professional programmer and technical author. He has worked with Unix systems since 1980, when he was introduced to a PDP-11 running a version of Sixth Edition Unix. He has been a heavy AWK user since 1987, when he became involved with gawk, the GNU project's version of AWK. As a member of the POSIX 1003.2 balloting group, he helped shape the POSIX standard for AWK. He is currently the maintainer of gawk and its documentation. He is also coauthor of the sixth edition of O'Reilly's Learning the vi Editor. Since late 1997, he and his family have been living happily in Israel.

Inhaltsangabe

Dedication
Preface
Korn Shell Versions
Summary of Korn Shell Features
Intended Audience
Code Examples
Chapter Summary
Conventions Used in This Handbook
About the Second Edition
We'd Like to Hear From You
Acknowledgments
Acknowledgments from the First Edition
Chapter 1: Korn Shell Basics
1.1 What Is a Shell?
1.2 Scope of This Book
1.3 History of Unix Shells
1.4 Getting the 1993 Korn Shell
1.5 Interactive Shell Use
1.6 Files
1.7 Input and Output
1.8 Background Jobs
1.9 Special Characters and Quoting
Chapter 2: Command-Line Editing
2.1 Enabling Command-Line Editing
2.2 The History File
2.3 Emacs Editing Mode
2.4 Vi Editing Mode
2.5 The hist Command
2.6 Finger Habits
Chapter 3: Customizing Your Environment
3.1 The .profile File
3.2 Aliases
3.3 Options
3.4 Shell Variables
3.5 Customization and Subprocesses
3.6 Customization Hints
Chapter 4: Basic Shell Programming
4.1 Shell Scripts and Functions
4.2 Shell Variables
4.3 Compound Variables
4.4 Indirect Variable References (namerefs)
4.5 String Operators
4.6 Command Substitution
4.7 Advanced Examples: pushd and popd
Chapter 5: Flow Control
5.1 if/else
5.2 for
5.3 case
5.4 select
5.5 while and until
Chapter 6: Command-Line Options and Typed Variables
6.1 Command-Line Options
6.2 Numeric Variables and Arithmetic
6.3 Arithmetic for
6.4 Arrays
6.5 typeset
Chapter 7: Input/Output and Command-Line Processing
7.1 I/O Redirectors
7.2 String I/O
7.3 Command-Line Processing
Chapter 8: Process Handling
8.1 Process IDs and Job Numbers
8.2 Job Control
8.3 Signals
8.4 trap
8.5 Coroutines
8.6 Shell Subprocesses and Subshells
Chapter 9: Debugging Shell Programs
9.1 Basic Debugging Aids
9.2 A Korn Shell Debugger
Chapter 10: Korn Shell Administration
10.1 Installing the Korn Shell as the Standard Shell
10.2 Environment Customization
10.3 Customizing the Editing Modes
10.4 System Security Features
Related Shells
The Bourne Shell
The 1988 Korn Shell
The IEEE 1003.2 POSIX Shell Standard
dtksh
tksh
pdksh
bash
zsh
Workalikes on PC Platforms
Reference Information
Invocation Options
Built-in Commands and Keywords
Predefined Aliases
Built-in Shell Variables
Test Operators
Options
Typeset Options
Arithmetic
Emacs Mode Commands
vi Control Mode Commands
Using getopts
Building ksh from Source Code
Korn Shell Web Sites
What You Can Download
Building ksh
AT&T ast Source Code License Agreement
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