Classic Shell Scripting Hidden Commands That Unlock the Power of Unix

ISBN-10: 0596005954
ISBN-13: 9780596005955
Edition: 2005
List price: $39.99 Buy it from $10.89
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Description: Shell scripting skills never go out of style. It's the shell that unlocks the real potential of Unix. Shell scripting is essential for Unix users and system administrators-a way to quickly harness and customize the full power of any Unix system.  More...

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Book details

List price: $39.99
Copyright year: 2005
Publisher: O'Reilly Media, Incorporated
Publication date: 5/26/2005
Binding: Paperback
Pages: 558
Size: 7.00" wide x 9.00" long x 1.25" tall
Weight: 1.386
Language: English

Shell scripting skills never go out of style. It's the shell that unlocks the real potential of Unix. Shell scripting is essential for Unix users and system administrators-a way to quickly harness and customize the full power of any Unix system. With shell scripts, you can combine the fundamental Unix text and file processing commands to crunch data and automate repetitive tasks. But beneath this simple promise lies a treacherous ocean of variations in Unix commands and standards. "Classic Shell Scripting is written to help you reliably navigate these tricky waters. Writing shell scripts requires more than just a knowledge of the shell language, it also requires familiarity with the individual Unix programs: why each one is there, how to use them by themselves, and in combination with the other programs. The authors are intimately familiar with the tips and tricks that can be used to create excellent scripts, as well as the traps that can make your best effort a bad shell script. With "Classic Shell Scripting you'll avoid hours of wasted effort. You'll learn not only write useful shell scripts, but how to do it properly and portably. The ability to program and customize the shell quickly, reliably, and portably to get the best out of any individual system is an important skill for anyone operating and maintaining Unix or Linux systems. "Classic Shell Scripting gives you everything you need to master these essential skills.

Arnold Robbins, an Atlanta native, is a professional programmer and technical author. He has been working with Unix systems since 1980, when he was introduced to a PDP-11 running a version of Sixth Edition Unix. His experience also includes multiple commercial Unix systems, from Sun, IBM, HP and DEC. He has been working with GNU/Linux systems since 1996. He likes his Macintosh laptop, but it has been commandeered by one of his daughters. Arnold has also 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. O'Reilly has been keeping him busy: He is author and/or coauthor of the bestselling titles: Unix In A Nutshell, Effective awk Programming, sed & awk, Classic Shell Scripting, and several pocket references.

Nelson Beebe is a long time Unix user and system administrator, and has helped for years on Usenet newsgroups.

Foreword
Preface
Background
Unix History
Software Tools Principles
Summary
Getting Started
Scripting Languages Versus Compiled Languages
Why Use a Shell Script?
A Simple Script
Self-Contained Scripts: The #! First Line
Basic Shell Constructs
Accessing Shell Script Arguments
Simple Execution Tracing
Internationalization and Localization
Summary
Searching and Substitutions
Searching for Text
Regular Expressions
Working with Fields
Summary
Text Processing Tools
Sorting Text
Removing Duplicates
Reformatting Paragraphs
Counting Lines, Words, and Characters
Printing
Extracting the First and Last Lines
Summary
Pipelines Can Do Amazing Things
Extracting Data from Structured Text Files
Structured Data for the Web
Cheating at Word Puzzles
Word Lists
Tag Lists
Summary
Variables, Making Decisions, and Repeating Actions
Variables and Arithmetic
Exit Statuses
The case Statement
Looping
Functions
Summary
Input and Output, Files, and Command Evaluation
Standard Input, Output, and Error
Reading Lines with read
More About Redirections
The Full Story on printf
Tilde Expansion and Wildcards
Command Substitution
Quoting
Evaluation Order and eval
Built-in Commands
Summary
Production Scripts
Path Searching
Automating Software Builds
Summary
Enough awk to Be Dangerous
The awk Command Line
The awk Programming Model
Program Elements
Records and Fields
Patterns and Actions
One-Line Programs in awk
Statements
User-Defined Functions
String Functions
Numeric Functions
Summary
Working with Files
Listing Files
Updating Modification Times with touch
Creating and Using Temporary Files
Finding Files
Running Commands: xargs
Filesystem Space Information
Comparing Files
Summary
Extend Example: Merging User Databases
The Problem
The Password Files
Merging Password Files
Changing File Ownership
Other Real-World Issues
Summary
Spellchecking
The spell Program
The Original Unix Spellchecking Prototype
Improving ispell and aspell
A Spellchecker in awk
Summary
Processes
Process Creation
Process Listing
Process Control and Deletion
Process System-Call Tracing
Process Accounting
Delayed Scheduling of Processes
The /proc Filesystem
Summary
Shell Portability Issues and Extensions
Gotchas
The bash shopt Command
Common Extensions
Download Information
Other Extended Bourne-Style Shells
Shell Versions
Shell Initialization and Termination
Summary
Secure Shell Scripts: Getting Started
Tips for Secure Shell Scripts
Restricted Shell
Trojan Horses
Setuid Shell Scripts: A Bad Idea
ksh93 and Privileged Mode
Summary
Writing Manual Pages
Files and Filesystems
Important Unix Commands
Bibliography
Glossary
Index

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