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by Ron Peters
Expert Shell Scripting
Title Page
Contents at a Glance
Contents
About the Author
About the Technical Reviewer
Acknowledgments
Introduction
How This Book Came About
Who Should Read This Book
Issues and Ideas
PART 1: Basic Scripting Techniques
CHAPTER 1: Shell Script Debugging
Shell Trace Options
Simple Output Statements
Controlling Output with Debug Levels
Simplifying Error Checking with a Function
Manual Stepping
CHAPTER 2: Standard Function Library
The Library File
Some Useful Functions
Using Your Library
CHAPTER 3: Date and Time Manipulation
Date in Days
Evaluating for the Current Day and Time
CHAPTER 4: Comparisons and Tests
The Basics of Comparisons
CHAPTER 5: Accepting Command-Line Options, Switches, and Parameters
CHAPTER 6: Testing Variables and Assigning Defaults
Setting Defaults
Variable Substitution
CHAPTER 7: Indirect Reference Variables
Log File Monitoring with Indirect Variables
The Main Monitor Loop
CHAPTER 8: Shell Process Tree
Process Tree Implemented Using Arrays
Process Tree Implemented Using Indirect Variables
Bourne Shell Implementation of a Process Tree
CHAPTER 9: Data Redirection
Avoiding Confusion
Common Redirection
Access to User-Specified File Handles
Descriptor Access from the Shell
CHAPTER 10: Piping Input to read
Line-by-Line Option 1
Line-by-Line Option 2
Line-by-Line Option 3
Line-by-Line Option 4
Pipe to read Directly
Process Input Word-by-Word
PART 2: System Interaction and Advanced Techniques
CHAPTER 11: Math from the Shell
expr
Internal Shell Math
bc
dc
CHAPTER 12: cron
crontab Entries
Environment Problems
Output Redirection
CHAPTER 13: Self-Linked Scripts
CHAPTER 14: Throttling Parallel Processes
Parallel Processing with ksh
Parallel Processing with bash
CHAPTER 15: Command-Line Editing and History
Setting Up vi Editing
Command and File Completion
CHAPTER 16: Scripting from the Command Line
A Few Examples
CHAPTER 17: Automating User Input with expect
A Shell Script to Customize Parameters for an expect Script
An expect Script to Automate telnet
CHAPTER 18: User Input Timeout
Manual Timeout Method
Timeout Using stty
General Timeout Utility
CHAPTER 19: Instant Keyboard Response
CHAPTER 20: Directory Copying
Using cp
Using tar
Using find
Using rsync
CHAPTER 21: A Brief Tour of the X Display Environment
The Display
X Traffic Through ssh
X Applications Through a Third-Party System
User-Profile Entry
Root-Profile Entry
Throw a Temporary Root Window
CHAPTER 22: X Navigation Window
Navigation Window Usage
Navigation Setup
Navigation Window
CHAPTER 23: Command-Line E-mail Attachments
uuencode
MIME Encoding
CHAPTER 24: Text-Processing One-Liners
Displaying Specific Fields
Specifying the Field Separator
Simple Pattern-Matching
Matching Fields Against Several Values
Determining the Number of Fields
Determining the Last Field
Determining the Second-to-Last Field
Passing Variables to awk
Using a Variable Passed to awk in a Condition
Displaying a Range of Fields (Main Method)
Displaying a Range of Fields (Alternate Method)
Determining the Length of a String Using awk
Determining the Length of a String Using expr
Displaying a Substring with awk
Displaying a Substring with expr
Conducting Simple Search and Replace with sed
Disregarding Blank and Commented Lines from a File
Conducting Dual Search and Replace with sed
Filtering Lines with sed
Searching for Multiple Strings with egrep
A Clean Method of Searching the Process Table
Summing Columns Using awk
Generating Random Numbers Using awk
Generating Random Numbers from the Shell
Displaying Character-Based Fields with sed
Escaping Special Characters
Returning Trailing Lines from a Pattern Match Using grep
Returning Preceding Lines to a Pattern Match Using grep
CHAPTER 25: Editing Files in Place
Simple Search and Replace with ed
Search and Replace Using ed, Dissected
Examples of ed Commands
Escaping Special Characters in a File
CHAPTER 26: Evaluating Variables in a Flat File
CHAPTER 27: Read Piped Input
CHAPTER 28: Free-Format Output Using cat
CHAPTER 29: Automating Interactive Processes
PART 3: Useful Scripts
CHAPTER 30: Automating E-mail with procmail
The .procmailrc File
Usage Examples
The Code
CHAPTER 31: Process-Management Monitor
CHAPTER 32: Managing File Counts
File-Count Monitor
Testing File-Count Methods
CHAPTER 33: Processes Running from inittab
CHAPTER 34: Automatic RCS
CHAPTER 35: Colorful /proc Reporting
CHAPTER 36: Password-Aging Notification
Script Initialization
Processing Begins
Determine Password Age
CHAPTER 37: A Pseudo–shadow File
CHAPTER 38: Linux Gold-System Build
CHAPTER 39: System Snapshots
Snapshot Script
Snapshot Promotion
Creating the Latest Snapshot
Final Thoughts
CHAPTER 40: Removing Large Files and Log Rolling
CHAPTER 41: Core Finder
CHAPTER 42: Network Adapter Failover
Check the Network
Switch the Interfaces
APPENDIX A: Test Switches
APPENDIX B: Special Parameters
APPENDIX C: Other Shell-Scripting Resources
Manual Pages
Books
Shell Resources
Online Resources
INDEX
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