Linux shell scripting bootcamp : explore the possibilities of the shell in a simple and elegant way / James Kent Lewis.

Format:

Book

Author/Creator:

Lewis, James Kent, author.

Language:

English

Subjects (All):

Linux.

Scripting languages (Computer science).

Operating systems (Computers).

Physical Description:

1 online resource (1 volume) : illustrations

Edition:

1st edition

Place of Publication:

Birmingham, England ; Mumbai, [India] : Packt Publishing, 2017.

System Details:

text file

Biography/History:

Lewis James K: James Kent Lewis has been in the computer industry for over 35 years. He started out writing BASIC programs in high school and used punch cards in college for his Pascal, Fortran, COBOL, and assembly language classes. He himself learned the C programming language by writing various utilities, including a fully-functional text editor, which he uses everyday. He started out using DOS and AIX, and then OS/2. Linux is now his operating system of choice. Jim has worked in the past for several companies, including IBM, Texas Instruments, Tandem, Raytheon, Hewlett-Packard, and others. Most of these positions dealt with low-level device drivers and operating system internals. In his spare time he likes to create video games in Java. He has written articles for IBM Developer Works and has one patent.

Summary:

A quick and straightforward approach to writing shell scripts to accomplish different types of tasks on a Linux system. About This Book Understand expressions and variables and how to use them practically Familiarize yourself with the various text filtering tools available in Linux A fast-paced and concise guide that gets you well versed with linux shell scripting. Who This Book Is For This book is for both GNU/Linux users who want to do amazing things with the shell and for advanced users looking for ways to make their lives with the shell more productive. What You Will Learn Get acquainted with the basics of a shell script to serve as a refresher for more advanced topics Learn different ways to create and run a script Discuss the passing and verification of parameters, along with the verification of other items. Understand the different forms of conditions and loops, and go over the sleep command in detail Learn about different ways to handle the reporting of return codes Create an interactive script by reading the keyboard and use subroutines and interrupts Create scripts to perform backups and go over the use of encryption tools and checksums Use wget and curl in scripts to get data directly from the Internet In Detail Linux Shell Scripting Bootcamp is all about learning the essentials of script creation, validating parameters, and checking for the existence of files and other items needed by the script. We will use scripts to explore iterative operations using loops and learn different types of loop statements, with their differences. Along with this, we will also create a numbered backup script for backup files. Further, you will get well-versed with how variables work on a Linux system and how they relate to scripts. You'll also learn how to create and call subroutines in a script and create interactive scripts. The most important archive commands, zip and tar, are also discussed for performing backups. Later, you will dive deeper by understanding the use of wget and curl scripts and the use of checksum and file encryption in further chapters. Finally, you will learn how to debug scripts and scripting best practices that will enable you to write a great code every time! By the end of the book, you will be able to write shell scripts that can dig data from the web and process it efficiently. Style and approach This book is all about fast and intensive learning. This means we don't waste time in helping readers get started. The new conten...

Contents:

Cover

Copyright

Credits

About the Author

Acknowledgement

About the Reviewer

www.PacktPub.com

Customer Feedback

Table of Contents

Preface

Chapter 1: Getting Started with Shell Scripting

Getting started

Using a good text editor

Demonstrating the use of scripts

Chapter 1 - Script 1

Chapter 1 - Script 2

Chapter 1 - Script 3

Chapter 1 - Script 4

Chapter 1 - Script 5

Chapter 1 - Script 6

Summary

Chapter 2: Working with Variables

Using variables in scripts

Chapter 2 - Script 1

Validating parameters using conditional statements

Chapter 2 - Script 2

Comparison operators for strings

Chapter 2 - Script 3

Chapter 2 - Script 4

Chapter 2 - Script 5

Environment variables

Chapter 2 - Script 6

Chapter 2 - Script 7

Chapter 3: Using Loops and the sleep Command

Using loops

Chapter 3 - Script 1

Chapter 3 - Script 2

Chapter 3 - Script 3

Screen manipulation

Chapter 3 - Script 4

Chapter 3 - Script 5

Indenting your code

Chapter 3 - Script 6

Using the for statement

Chapter 3 - Script 7

Chapter 3 - Script 8

Leaving a loop early

Chapter 3 - Script 9

The sleep command

Chapter 3 - Script 10

Chapter 3 - Script 11

Watching a process

Chapter 3 - Script 12

Creating numbered backup files

Chapter 3 - Script 13

Chapter 4: Creating and Calling Subroutines

Clearing the screen

Chapter 4 - Script 1

File redirection

Command piping

Chapter 4 - Script 2

Chapter 4 - Script 3

Subroutines

Chapter 4 - Script 4

Using parameters

Chapter 4 - Script 5

Chapter 4 - Script 6

Making a current backup of your work

Chapter 4 - Script 7

Chapter 5: Creating Interactive Scripts

Chapter 5 - Script 1

Chapter 5 - Script 2

Chapter 5 - Script 3.

Chapter 5 - Script 4

Chapter 5 - Script 5

Chapter 5 - Script 6

Chapter 5 - Script 7

Chapter 5 - Script 8

Chapter 6: Automating Tasks with Scripts

Chapter 6 - Script 1

Chapter 6 - Script 2

Chapter 6 - Script 3

Chapter 6 - Script 4

Cron

Chapter 6 - Script 5

Chapter 6 - Script 6

Chapter 6 - Script 7

Chapter 7: Working with Files

Writing files

Chapter 7 - Script 1

Reading files

Chapter 7 - Script 2

Chapter 7 - Script 3

Chapter 7 - Script 4

Reading and writing files

Chapter 7 - Script 5

Reading and writing files interactively

Chapter 7 - Script 6

File checksums

File encryption

Chapter 7 - Script 7

Chapter 8: Working with wget and curl

Introducing the wget program

wget options

wget return codes

wget configuration files

Chapter 8 - Script 1

wget and recursion

curl

curl options

Chapter 8 - Script 2

Chapter 9: Debugging Scripts

Syntax errors

Chapter 9 - Script 1

Chapter 9 - Script 2

Automatic backups

More syntax errors

Chapter 9 - Script 3

Logic errors

Chapter 9 - Script 4

Using set to debug scripts

Chapter 9 - Script 5 and Script 6

Chapter 9 - Script 7

Chapter 9 - Script 8

Chapter 9 - Script 9

Chapter 10: Scripting Best Practices

Verifying backups

ssh and scp

Find and use a good text editor

Environment variables and aliases

ssh prompt

Testing an archive

Progress indicator

Chapter 10 - Script 1

Creating new commands from a template

Chapter 10 - Script 2

Alerting the user

Chapter 10 - Script 3

Index.

Notes:

Includes index.

Includes bibliographical references at the end of each chapters and index.

Description based on online resource; title from PDF title page (ebrary, viewed August 16, 2017).

OCLC:

999610969