Mastering Linux Shell Scripting by Ebrahim, Mokhtar -- Read -- Imperial Library of Trantor

Index

Title Page Copyright and Credits

Mastering Linux Shell Scripting Second Edition

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Contributors

About the authors About the reviewer Packt is searching for authors like you

Preface

Who this book is for What this book covers To get the most out of this book

Download the example code files Download the color images Conventions used

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Reviews

The What and Why of Scripting with Bash

Technical requirements Types of Linux shells What is bash scripting? The bash command hierarchy

Command type Command PATH

Preparing text editors for scripting

Configuring vim Configuring nano Configuring gedit

Creating and executing scripts

Hello World! Executing the script Checking the exit status Ensuring a unique name Hello Dolly!

Running the script with arguments The importance of correct quotes

Printing the script name

Declaring variables

User-defined variables Environment variables

Variable scope Command substitution Debugging your scripts Summary Questions Further reading

Creating Interactive Scripts

Technical requirements 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 the entered text Passing options

Passing parameters with options Read options values

Try to be standard Enhancing learning with simple scripts

Backing-up with scripts Connecting to a server Version 1 – ping Version 2 – SSH Version 3 – MySQL/MariaDB Reading files

Summary Questions Further reading

Conditions Attached

Technical requirements Simple decision paths using command-line lists Verifying user input with lists Using the test shell built-in

Testing strings Testing integers Testing file types

Creating conditional statements using if Extending if with else Test command with the if command

Checking strings Checking files and directories Checking numbers Combining tests

More conditions with elif

Creating the backup2.sh using elif

Using case statements Recipe – building a frontend with grep Summary Questions Further reading

Creating Code Snippets

Technical requirements Abbreviations Using code snippets

Bringing color to the Terminal

Creating snippets using VS Code Summary Questions Further reading

Alternative Syntax

Technical requirement Recapping the test command

Testing files Adding logic Square brackets as not seen before

Providing parameter defaults

Variables Special parameters Setting defaults

When in doubt – quote! Advanced tests using [[

White space Other advanced features

Pattern matching Regular expressions Regular expression script

Arithmetic operations using ((

Simple math Parameter manipulation Standard arithmetic tests

Summary Questions Further reading

Iterating with Loops

Technical requirement for loops Advanced for loops The IFS Counting directories and files C-style for loops Nested loops Redirecting loop output

Controlling the loop

while loops and until loops Reading input from files Creating operator menus Summary Questions Further reading

Creating Building Blocks with Functions

Technical requirements Introducing functions Passing parameters to functions

Passing arrays

Variable scope Returning values from functions Recursive functions Using functions in menus Summary Questions Further reading

Introducing the Stream Editor

Technical requirements Using grep to display text

Displaying received data on an interface Displaying user account data Listing the number of CPUs in a system Parsing CSV files

The CSV file Isolating catalog entries

Understanding the basics of sed

The substitute command Global replacement Limiting substitution Editing the file

Other sed commands

The delete command The insert and append commands The change command The transform command

Multiple sed commands Summary Questions Further reading

Automating Apache Virtual Hosts

Technical requirements Apache name-based Virtual Hosts

Creating the virtual host template First steps Isolating lines sed script files

Automating virtual host creation

Prompting for data during site creation

Summary Questions Further reading

AWK Fundamentals

Technical requirements The history behind AWK Displaying and filtering content from files AWK variables

User-defined variables

Conditional statements

The if command while loops for loops

Formatting output Further filtering to display users by UID AWK control files

Built-in functions

Summary Questions Further reading

Regular Expressions

Technical requirements Regular expression engines Defining BRE patterns

Anchor characters The dot character The character class Ranges of characters Special character classes The asterisk

Defining ERE patterns

The question mark The plus sign Curly braces The pipe character Expression grouping

Using grep Summary Questions Further reading

Summarizing Logs with AWK

Technical requirements The HTTPD log file format Displaying data from web logs

Selecting entries by date Summarizing 404 errors Summarizing HTTP access codes Resources hits Identify image hotlinking

Displaying the highest ranking IP address Displaying the browser data Working with email logs Summary Questions Further reading

A Better lastlog with AWK

Technical requirements Using AWK ranges to exclude data

The lastlog command Horizontally filtering rows with AWK Counting matched rows

Conditions based on the number of fields Manipulating the AWK record separator to report on XML data

Apache Virtual Hosts XML catalog

Summary Questions Further reading

Using Python as a Bash Scripting Alternative

Technical requirements What is Python? Saying Hello World the Python way Pythonic arguments Supplying arguments Counting arguments Significant whitespace Reading user input Using Python to write to files String manipulation Summary Questions Further reading

Assessments

Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Chapter 11 Chapter 12 Chapter 13 Chapter 14

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