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Home> Cloud & Networking> Shell Scripting> Mastering Linux Shell Scripting
Mastering Linux Shell Scripting
Mastering Linux Shell Scripting

Mastering Linux Shell Scripting: Master the complexities of Bash shell scripting and unlock the power of shell for your enterprise

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Profile Icon Andrew Mallett
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€29.99
Full star iconFull star iconFull star iconFull star iconHalf star icon4.3(10 Ratings)
HardcoverDec 2015284 pages1st Edition
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Table of content iconView table of contents

Key benefits

  • Identify the high level steps such as verifying user input, using command lines and conditional statements in creating and executing simple shell scripts
  • Create and edit dynamic shell scripts to manage complex and repetitive tasks
  • Learn about scripting in Perl and programming in Python as a BASH scripting alternative with this practical, step-by-step guide

Description

Shell scripting is a quick method to prototype a complex application or a problem by automating tasks when working on Linux-based systems. Using both simple one-line commands and command sequences complex problems can be solved with ease, from text processing to backing up sysadmin tools.In this book, you’ll discover everything you need to know to master shell scripting and make informed choices about the elements you employ. Get to grips with the fundamentals of creating and running a script in normal mode, and in debug mode. Learn about various conditional statements' code snippets, and realize the power of repetition and loops in your shell script. Implement functions and edit files using the Stream Editor, script in Perl, program in Python – as well as complete coverage of other scripting languages to ensure you can choose the best tool for your project.

Who is this book for?

Mastering Linux Shell Scripting has been written for Linux administrators who want to automate tasks in their daily lives, saving time and effort. You’ll need to have command-line experience and be familiar with the tasks that you need to automate.

What you will learn

  • * Use the type command to identify the order of command evaluation
  • * Create interactive scripts that prompt for user input
  • * Foster menu structures for operators with little command-line experience
  • * Develop scripts that dynamically edit web configuration files to produce a new virtual host
  • * Write scripts that use AWK to search and reports on log files
  • * Draft effective scripts using functions as building blocks, reducing maintenance and build time
  • * Make informed choices by comparing different script languages such as Perl and Python with BASH
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Publication date :Dec 24, 2015
Length:284 pages
Edition :1st
Language :English
ISBN-13 :9781788990554
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Product Details

Publication date :Dec 24, 2015
Length:284 pages
Edition :1st
Language :English
ISBN-13 :9781788990554
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Table of Contents

15 Chapters
1. What and Why of Scripting with BashChevron down iconChevron up icon
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
2. Creating Interactive ScriptsChevron down iconChevron up icon
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
3. Conditions AttachedChevron down iconChevron up icon
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
4. Creating Code SnippetsChevron down iconChevron up icon
4. Creating Code Snippets
Abbreviations
Using code snippets
Summary
5. Alternative SyntaxChevron down iconChevron up icon
5. Alternative Syntax
Recapping test
Providing parameter defaults
When in doubt – Quote!
Advanced test using [[
Arithmetic operations using ((
Summary
6. Iterating with LoopsChevron down iconChevron up icon
6. Iterating with Loops
For loops
Controlling the loop
Reading input from files
Creating operator menus
Summary
7. Creating Building Blocks with FunctionsChevron down iconChevron up icon
7. Creating Building Blocks with Functions
Introducing functions
Passing parameters to functions
Returning values from functions
Using functions in menus
Summary
8. Introducing sedChevron down iconChevron up icon
8. Introducing sed
Using grep to display text
Using regular expressions
Understanding the basics of sed
Summary
9. Automating Apache Virtual HostsChevron down iconChevron up icon
9. Automating Apache Virtual Hosts
Apache name-based Virtual Hosts
Automating Virtual Host creation
Summary
10. Awk FundamentalsChevron down iconChevron up icon
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
11. Summarizing Logs with AwkChevron down iconChevron up icon
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
12. A Better lastlog with AwkChevron down iconChevron up icon
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
13. Using Perl as a Bash Scripting AlternativeChevron down iconChevron up icon
13. Using Perl as a Bash Scripting Alternative
What is Perl?
Hello World
Perl arrays
Conditional statements in Perl
Using functions within Perl
Summary
14. Using Python as a Bash Scripting AlternativeChevron down iconChevron up icon
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
IndexChevron down iconChevron up icon
Index

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Customer reviews

Top Reviews
Rating distribution
Full star iconFull star iconFull star iconFull star iconHalf star icon4.3
(10 Ratings)
5 star70%
4 star10%
3 star10%
2 star0%
1 star10%
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Top Reviews

Filter reviews by




SuJoFeb 27, 2016
Full star iconFull star iconFull star iconFull star iconFull star icon5
I was extremely skeptical at first glance; however after reading this book it truly covers each topic with enough detail to give a clear understanding of the tasks at hand. Doing a lot of automation work with frameworks like Puppet which can benefit from shell scripts, and all I can say is wow.. you really need to pickup a copy of this book as it is well worth the cost.
Amazon Verified reviewAmazon
C.P.Feb 26, 2017
Full star iconFull star iconFull star iconFull star iconFull star icon5
This book so far has been very useful and I am very pleased with the contents so far. I have read about 1/3 and so far an A+ from me.
Amazon Verified reviewAmazon
Mark SmithApr 16, 2016
Full star iconFull star iconFull star iconFull star iconFull star icon5
Great Book and highly recommend.
Amazon Verified reviewAmazon
Perry NallyMar 02, 2016
Full star iconFull star iconFull star iconFull star iconFull star icon5
Almost all you need, and certainly all you need to get you up and running. Gave me the ins and outs of the bash shell as well as pointed me in the right direction with the intro to Peral and Python as additional resources to use when bash shell does allow my to do what I need. I'll have this book as a reference for a very long time when I start building linux embedded devices. I know I'll be turning to this book for references on creating the scripts I need.
Amazon Verified reviewAmazon
Tim CrothersMar 10, 2016
Full star iconFull star iconFull star iconFull star iconFull star icon5
Really, really good coverage of bash scripting core fundamentals. Literally one of the best I've read and I've read many of them. I wouldn't go nearly as far as to say complete as some of the other reviews have stated but it definitely does a really good job of getting you started down the road. The only issue I had in the end is the "mastering" part of the title. I don't think any book under 200 pages should claim to provide mastery of a topic, especially one as complex as bash shell scripting, but in the end I decided not to dock it a start because it does such a good job at what it does cover. My preference would be to drop the small sections on Perl and Python. They are topics worthy of their own treatment and the pages could have been put to better use going deeper on shell scripting.
Amazon Verified reviewAmazon
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About the author

Profile icon Andrew Mallett
Andrew Mallett
Andrew Mallett has been working professionally with Linux since 1999; much of that time as an Instructor. He now runs his consultancy where he works with and writes about Linux. He is onto his 5th book with Packt and has 65,000 subscribers on his YouTube channel: theurbanpenguin. You can be assured that he masters Linux and is passionate to share his knowledge with you.
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Unfortunately, due to several restrictions, we are unable to ship to the following countries:

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