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  • Book Overview & Buying Learn Linux Shell Scripting ‚àö¬¢‚Äö√ᬮ‚Äö√Ñ√∫ Fundamentals of Bash 4.4
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Learn Linux Shell Scripting – Fundamentals of Bash 4.4

Learn Linux Shell Scripting – Fundamentals of Bash 4.4

By : Tammer
5 (1)
Buy this Book
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Learn Linux Shell Scripting – Fundamentals of Bash 4.4

Learn Linux Shell Scripting – Fundamentals of Bash 4.4

5 (1)
By: Tammer
Buy this Book

Overview of this book

Shell scripts allow us to program commands in chains and have the system execute them as a scripted event, just like batch files. This book will start with an overview of Linux and Bash shell scripting, and then quickly deep dive into helping you set up your local environment, before introducing you to tools that are used to write shell scripts. The next set of chapters will focus on helping you understand Linux under the hood and what Bash provides the user. Soon, you will have embarked on your journey along the command line. You will now begin writing actual scripts instead of commands, and will be introduced to practical applications for scripts. The final set of chapters will deep dive into the more advanced topics in shell scripting. These advanced topics will take you from simple scripts to reusable, valuable programs that exist in the real world. The final chapter will leave you with some handy tips and tricks and, as regards the most frequently used commands, a cheat sheet containing the most interesting flags and options will also be provided. After completing this book, you should feel confident about starting your own shell scripting projects, no matter how simple or complex the task previously seemed. We aim to teach you how to script and what to consider, to complement the clear-cut patterns that you can use in your daily scripting challenges.
Table of Contents (20 chapters)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Get in touch
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Disclaimer
Lock Free Chapter
1
Introduction
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Introduction
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What is Linux?
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What is Bash?
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Summary
2
Setting Up Your Local Environment
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Setting Up Your Local Environment
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Technical requirements
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Choosing between a virtual machine and a physical installation
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Setting up VirtualBox
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Creating an Ubuntu virtual machine
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Summary
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Questions
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Further reading
3
Choosing the Right Tools
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Choosing the Right Tools
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Technical requirements
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Using graphical editors for shell scripting
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Using command-line editors
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Combining graphical editors with command-line editors when writing shell scripts
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Summary
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Questions
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Further reading
4
The Linux Filesystem
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The Linux Filesystem
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Technical requirements
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The Linux filesystem explained
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Structure of the Linux filesystem
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Everything is a file
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Summary
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Questions
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Further reading
5
Understanding the Linux Permissions Scheme
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Understanding the Linux Permissions Scheme
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Technical requirements
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Read, write, and execute
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Users, groups, and others
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Manipulating file permissions and ownership
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Working with multiple users
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Advanced permissions
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Summary
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Questions
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Further reading
6
File Manipulation
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File Manipulation
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Technical requirements
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Common file operations
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Archiving
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Finding files
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Summary
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Questions
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Further reading
7
Hello World!
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Hello World!
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Technical requirements
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First steps
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Readability
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Keep It Simple, Stupid (KISS)
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Summary
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Questions
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Further reading
8
Variables and User Input
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Variables and User Input
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Technical requirements
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What is a variable?
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Variable naming
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Dealing with user input
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Interactive versus non-interactive scripts
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Summary
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Questions
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Further reading
9
Error Checking and Handling
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Error Checking and Handling
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Technical requirements
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Error checking
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Error handling
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Error prevention
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Summary
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Questions
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Further reading
10
Regular Expressions
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Regular Expressions
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Technical requirements
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Introducing regular expressions
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Globbing
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Using regular expressions with egrep and sed
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Final remarks
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Summary
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Questions
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Further reading
11
Conditional Testing and Scripting Loops
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Conditional Testing and Scripting Loops
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Technical requirements
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Advanced if-then-else
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The while loop
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The for loop
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Loop control
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Summary
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Questions
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Further reading
12
Using Pipes and Redirection in Scripts
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Using Pipes and Redirection in Scripts
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Technical requirements
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Input/output redirection
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Pipes
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Here documents
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Summary
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Questions
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Further reading
13
Functions
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Functions
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Technical requirements
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Functions explained
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Augmenting functions with parameters
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Function libraries
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Summary
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Questions
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Further reading
14
Scheduling and Logging
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Scheduling and Logging
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Technical requirements
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Scheduling with at and cron
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Logging script results
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Summary
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Questions
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Further reading
15
Parsing Bash Script Arguments with getopts
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Parsing Bash Script Arguments with getopts
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Technical requirements
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Positional parameters versus flags
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The getopts shell builtin
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Summary
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Questions
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Further reading
16
Bash Parameter Substitution and Expansion
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Bash Parameter Substitution and Expansion
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Technical requirements
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Parameter expansion
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Variable manipulation
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Summary
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Questions
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Further reading
17
Tips and Tricks with Cheat Sheet
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Tips and Tricks with Cheat Sheet
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Technical requirements
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General tips and tricks
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Command-line shortcuts
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Cheat sheet for interactive commands
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Summary
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Final words
18
Assessments
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Assessments
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Chapter 2
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Chapter 3
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Chapter 4
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Chapter 5
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Chapter 6
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Chapter 7
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Chapter 8
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Chapter 9
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Chapter 10
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Chapter 11
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Chapter 12
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Chapter 13
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Chapter 14
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Chapter 15
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Chapter 16
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Other Books You May Enjoy
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Other Books You May Enjoy
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Introduction

Before we start writing shell scripts, we need to have some context about our two most relevant components: Linux and Bash. We'll give an explanation of Linux and Bash, look into the history behind the two technologies, and discuss the current state of both.

The following topics will be covered in this chapter:

  • What is Linux?
  • What is Bash?
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Programming languages
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