Mastering Linux Shell Scripting

Summary

Reading user input

Significant whitespace

Pythonic arguments

Saying Hello World the Python way

What is Python?

Chapter 14. Using Python as a Bash Scripting Alternative

Summary

Using functions within Perl

Conditional statements in Perl

Perl arrays

Hello World

What is Perl?

Chapter 13. Using Perl as a Bash Scripting Alternative

Summary

Manipulating the awk record separator to report on XML data

Conditions based on the number of fields

Using awk ranges to exclude data

Chapter 12. A Better lastlog with Awk

Summary

Working with e-mail logs

Displaying the browser data

Displaying the highest ranking IP address

Displaying data from web logs

The HTTPD log file format

Chapter 11. Summarizing Logs with Awk

Summary

Awk control files

Further filtering to display users by UID

Formatting output

Displaying and filtering content from files

The history behind awk

Chapter 10. Awk Fundamentals

Summary

Automating Virtual Host creation

Apache name-based Virtual Hosts

Chapter 9. Automating Apache Virtual Hosts

Summary

Understanding the basics of sed

Using regular expressions

Using grep to display text

Chapter 8. Introducing sed

Summary

Using functions in menus

Returning values from functions

Passing parameters to functions

Introducing functions

Chapter 7. Creating Building Blocks with Functions

Summary

Creating operator menus

Reading input from files

Controlling the loop

For loops

Chapter 6. Iterating with Loops

Summary

Arithmetic operations using ((

Advanced test using [[

When in doubt – Quote!

Providing parameter defaults

Recapping test

Chapter 5. Alternative Syntax

Summary

Using code snippets

Abbreviations

Chapter 4. Creating Code Snippets

Summary

Script – building a front-end with grep

Using case statements

More conditions with elif

Extending if with else

Creating conditional statements using if

Using the test shell builtin

Verifying user input with lists

Simple decision paths using command-line lists

Chapter 3. Conditions Attached

Summary

Enhancing learning with simple scripts

Controlling the visibility of entered text

Limiting the number of entered characters

Enhancing scripts with read prompts

Script comments

Basic script using read

Using echo with options

Chapter 2. Creating Interactive Scripts

Summary

Debugging your scripts

Creating and executing scripts

Preparing text editors for scripting

The bash command hierarchy

Bash vulnerabilities

Chapter 1. What and Why of Scripting with Bash

Customer support

Reader feedback

Conventions

Who this book is for

What you need for this book

What this book covers

Preface

Support files eBooks discount offers and more

www.PacktPub.com

About the Reviewer

About the Author

Credits

版权页

封面

封面

版权页

Credits

About the Author

About the Reviewer

www.PacktPub.com

Support files eBooks discount offers and more

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Chapter 1. What and Why of Scripting with Bash

Bash vulnerabilities

The bash command hierarchy

Preparing text editors for scripting

Creating and executing scripts

Debugging your scripts

Summary

Chapter 2. Creating Interactive Scripts

Using echo with options

Basic script using read

Script comments

Enhancing scripts with read prompts

Limiting the number of entered characters

Controlling the visibility of entered text

Enhancing learning with simple scripts

Summary

Chapter 3. Conditions Attached

Simple decision paths using command-line lists

Verifying user input with lists

Using the test shell builtin

Creating conditional statements using if

Extending if with else

More conditions with elif

Using case statements

Script – building a front-end with grep

Summary

Chapter 4. Creating Code Snippets

Abbreviations

Using code snippets

Summary

Chapter 5. Alternative Syntax

Recapping test

Providing parameter defaults

When in doubt – Quote!

Advanced test using [[

Arithmetic operations using ((

Summary

Chapter 6. Iterating with Loops

For loops

Controlling the loop

Reading input from files

Creating operator menus

Summary

Chapter 7. Creating Building Blocks with Functions

Introducing functions

Passing parameters to functions

Returning values from functions

Using functions in menus

Summary

Chapter 8. Introducing sed

Using grep to display text

Using regular expressions

Understanding the basics of sed

Summary

Chapter 9. Automating Apache Virtual Hosts

Apache name-based Virtual Hosts

Automating Virtual Host creation

Summary

Chapter 10. Awk Fundamentals

The history behind awk

Displaying and filtering content from files

Formatting output

Further filtering to display users by UID

Awk control files

Summary

Chapter 11. Summarizing Logs with Awk

The HTTPD log file format

Displaying data from web logs

Displaying the highest ranking IP address

Displaying the browser data

Working with e-mail logs

Summary

Chapter 12. A Better lastlog with Awk

Using awk ranges to exclude data

Conditions based on the number of fields

Manipulating the awk record separator to report on XML data

Summary

Chapter 13. Using Perl as a Bash Scripting Alternative

What is Perl?

Hello World

Perl arrays

Conditional statements in Perl

Using functions within Perl

Summary

Chapter 14. Using Python as a Bash Scripting Alternative

What is Python?

Saying Hello World the Python way

Pythonic arguments

Significant whitespace

Reading user input

Summary