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Home > Business & Other > Workflow Automation > Bash Cookbook
Bash Cookbook
Bash Cookbook

Bash Cookbook: Leverage Bash scripting to automate daily tasks and improve productivity

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Bash Cookbook

Acting Like a Typewriter and File Explorer

 In this chapter, we will introduce the following:

  • Basic searching for strings and files
  • Using wildcards and regexes
  • Math and calculations in script
  • Striping/altering/sorting/deleting/searching strings with Bash only
  • Using SED and AWK to remove/replace substrings
  • Formatting your data/output using echo and printf
  • Readying your script for different languages with internationalization
  • Calculating statistics and reducing duplicates based on file contents
  • Using file attributes with conditional logic
  • Reading delimited data and altered output format

Introduction

Hopefully, the previous Bash crash course chapter provided more than a hint of the utility and power of Bash. On the other hand, this chapter introduces several bolt-on technologies to make Bash even more extensive when searching for items and text, or automating file explorer/file system operations. 

By itself, Bash is merely a powerful scripting language, but much of Bash's flexibility comes from being able to "glue" other technologies (tools or languages) together to make the output more useful. In other words, Bash is a base platform similar to how some auto/car lovers choose a particular platform before making their modifications. Will a modified car do everything, even with enhancements? Certainly not, but it can make it more powerful or useful in specific cases, and at least provides four wheels for movement.

Not only do common scripts...

Basic searching for strings and files

Imagine searching for a four leaf clover in a big garden. It would be really hard (and it is still really hard for computers). Thankfully, words are not images and text on a computer is easily searchable depending on the format. The term format has to be used because if your tool cannot understand a given type of text (encoding), then you might have trouble recognizing a pattern or even detecting that there is text at all!

Typically, when you are looking at the console, text files, source code (C, C++, Bash, HTML), spreadsheets, XML, and other types, you are looking at it in ASCII or UTF. ASCII is a commonly used format in the *NIX world on the console. There is also the UTF encoding scheme, which is an improvement upon ASCII and can support a variety of extended characters that were not present in computing originally...

Using wildcards and regexes

As we saw in the previous section, there was this new concept of recursive functions and the introduction of wildcards. This section will extend upon those same fundamental primitives to create more advanced searches using regexes and globbing.

It will also extend them with a number of built-in Bash features, and some one-liners (nifty tricks) to enhance our searches. In short:

  • A wildcard can be: *, {*.ooh,*.ahh}, /home/*/path/*.txt, [0-10], [!a], ?, [a,p] m
  • A regex can be: $, ^, *, [], [!], | (be careful to escape this)

Globbing basically refers to a far more computer-eccentric term, which can be simply described in layman terms as extended pattern matching. Wildcards are the symbols used to describe patterns, and regex is short for regular expression, which are terms used to describe the pattern that is to match a series...

Math and calculations in script

After a grueling introduction to the world of wildcards and regexes for searches, we're going to move on to being able to perform some basic mathematical operations at the console. If you haven't already tried, what happens when you run something like the following in the Bash shell? Does it look like this?

$ 1*5
1*5: command not found

Command not found? Certainly, we know the computer can do math, but clearly Bash is unable to interpret mathematical operations in this way. We have to ensure that Bash is able to interpret these operations correctly through the use of:

  • The expr command (antiquated)
  • The bc command
  • POSIX Bash shell expansion
  • Another language/program to do the dirty work

Let's try again, but using the POSIX Bash shell expansion:

$ echo $((1*5))
5

We got the expected answer of 5, but where does...

Striping/altering/sorting/deleting/searching strings with Bash only

So far, we have seen inkling of the power of commands available in Linux, and some of these are among the most powerful: sed and grep. However, while we can easily use these commands together, sed by itself or even using another very useful command called awk, we can leverage Bash itself to shave time and reduce external dependencies in a portable way!

So, how can we do this? Let's begin with a few examples using this Bash syntax:

#!/bin/bash
# Index zero of VARIABLE is the char 'M' & is 14 bytes long
VARIABLE="My test string"
# ${VARIABLE:startingPosition:optionalLength}
echo ${VARIABLE:3:4}

In the preceding example, we can see a special way of calling special substring functionality using ${...} , where VARIABLE is a string variable within your script (or even global)...

Using SED and AWK to remove/replace substrings

Again, when we need to remove a pesky character or remove sections of strings upon occurrence, we can always rely on these two powerful commands: sed and awk. And while we saw that Bash does indeed have a similar functionality built-in, the full tools are able to offer the same and more complex functionality. So, when should we use these tools?

  • When we care less about the speed that might be gained by using the built-in functionality of Bash
  • When more complex features are needed (when programming constructs like multi-dimensional arrays are required or editing streams)
  • When we are focused on portability (Bash might be embedded or a limited version and standalone tools may be required)
Complete books have been written on both SED and AWK, and you can always find far more information online at https://www.gnu.org...

Formatting your data/output using echo and printf

Sometimes, finding the string or the exact data you are looking for is the easy part of your task, but formatting the output data is tricky. For example, here are some situations that have subtle elements that need to be altered:

  • Echoing output without the newline terminator (\n)
  • Echoing raw hexadecimal (hex) data
  • Printing raw hexadecimal values and printable ASCII characters
  • Concatenating strings
  • Escaping specific characters
  • Aligning text
  • Printing horizontal rules

In addition to tricks, we can also print values to the screen that are also floats as well (in addition to the recipe for math). Wait, what is a hexadecimal number? Yes, another type of data or at least a representation exists. To understand what hexadecimals are, we first need to remember that computers use binary, which consists of 1s and 0s (ones and zeros...

Readying your script for different languages with internationalization

Great, so you have this awesome script, but it's written in standard English and you would like to target those nice people who speak other languages. In some countries like Canada, they (we) have two official languages: English and French. Sometimes, the dual-language component is enforced with legislature and localized language laws. 

To get around this, let's imagine a scenario where you are an individual who has written a script that prints out specific strings, but in English first. He/she wishes to have all of the strings inside of variables so that they can be swapped in and out dynamically using system language variables. Here are the basics:

  • Create a shell script that utilizes gettext and sets the appropriate variables
  • Build a po file that contains the necessary...

Introduction

Hopefully, the previous Bash crash course chapter provided more than a hint of the utility and power of Bash. On the other hand, this chapter introduces several bolt-on technologies to make Bash even more extensive when searching for items and text, or automating file explorer/file system operations. 

By itself, Bash is merely a powerful scripting language, but much of Bash's flexibility comes from being able to "glue" other technologies (tools or languages) together to make the output more useful. In other words, Bash is a base platform similar to how some auto/car lovers choose a particular platform before making their modifications. Will a modified car do everything, even with enhancements? Certainly not, but it can make it more powerful or useful in specific cases, and at least provides four wheels for movement.

Not only do common scripts contain a series of commands for automation, they often include logic to modify strings such as the following:

  • Removing trailing characters...

Basic searching for strings and files

Imagine searching for a four leaf clover in a big garden. It would be really hard (and it is still really hard for computers). Thankfully, words are not images and text on a computer is easily searchable depending on the format. The term format has to be used because if your tool cannot understand a given type of text (encoding), then you might have trouble recognizing a pattern or even detecting that there is text at all!

Typically, when you are looking at the console, text files, source code (C, C++, Bash, HTML), spreadsheets, XML, and other types, you are looking at it in ASCII or UTF. ASCII is a commonly used format in the *NIX world on the console. There is also the UTF encoding scheme, which is an improvement upon ASCII and can support a variety of extended characters that were not present in computing originally. It comes in a number of formats such as UTF-8, UTF-16, and UTF32.

Note

When you hear the words encoding and decoding, it is similar to...

Using wildcards and regexes

As we saw in the previous section, there was this new concept of recursive functions and the introduction of wildcards. This section will extend upon those same fundamental primitives to create more advanced searches using regexes and globbing.

It will also extend them with a number of built-in Bash features, and some one-liners (nifty tricks) to enhance our searches. In short:

  • A wildcard can be: *, {*.ooh,*.ahh}, /home/*/path/*.txt, [0-10], [!a], ?, [a,p] m
  • A regex can be: $, ^, *, [], [!], | (be careful to escape this)

Globbing basically refers to a far more computer-eccentric term, which can be simply described in layman terms as extended pattern matching. Wildcards are the symbols used to describe patterns, and regex is short for regular expression, which are terms used to describe the pattern that is to match a series of data.

Note

Globbing in Bash is powerful, but likely not the best place to perform even more advanced or intricate pattern matching. In these cases...

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Key benefits

  • Automate tedious and repetitive tasks
  • Create several novel applications ranging from a simple IRC logger to a Web Scraper
  • Manage your system efficiently by becoming a seasoned Bash user

Description

In Linux, one of the most commonly used and most powerful tools is the Bash shell. With its collection of engaging recipes, Bash Cookbook takes you through a series of exercises designed to teach you how to effectively use the Bash shell in order to create and execute your own scripts. The book starts by introducing you to the basics of using the Bash shell, also teaching you the fundamentals of generating any input from a command. With the help of a number of exercises, you will get to grips with the automation of daily tasks for sysadmins and power users. Once you have a hands-on understanding of the subject, you will move on to exploring more advanced projects that can solve real-world problems comprehensively on a Linux system. In addition to this, you will discover projects such as creating an application with a menu, beginning scripts on startup, parsing and displaying human-readable information, and executing remote commands with authentication using self-generated Secure Shell (SSH) keys. By the end of this book, you will have gained significant experience of solving real-world problems, from automating routine tasks to managing your systems and creating your own scripts.

Who is this book for?

The Bash Cookbook is for you if you are a power user or system administrator involved in writing Bash scripts in order to automate tasks. This book is also ideal if you are interested in learning how to automate complex daily tasks.

What you will learn

  • Understand the basics of Bash shell scripting on a Linux system
  • Gain working knowledge of how redirections and pipes interact
  • Retrieve and parse input or output of any command
  • Automate tasks such as data collection and creating and applying a patch
  • Create a script that acts like a program with different features
  • Customize your Bash shell and discover neat tricks to extend your programs
  • •Compile and install shell and log commands on your system s console using Syslog
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Publication date : Jul 31, 2018
Length: 264 pages
Edition : 1st
Language : English
ISBN-13 : 9781788629362
Category :
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Languages :
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Concepts :
Workflow Automation
Tools :
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Product Details

Publication date : Jul 31, 2018
Length: 264 pages
Edition : 1st
Language : English
ISBN-13 : 9781788629362
Category :
Business & Other
Languages :
Bash
Concepts :
Workflow Automation
Tools :
Bash

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Table of Contents

9 Chapters
Crash Course in Bash Chevron down icon Chevron up icon
Crash Course in Bash
Getting started with Bash and CLI fundamentals
Creating and using basic variables
Hidden Bash variables and reserved words
Conditional logic using if, else, and elseif
Case/switch statements and loop constructs
Using functions and parameters
Including source files
Retrieving return codes and output
Linking commands, pipes, and input/output
Getting program input parameters 
Getting additional information about commands
Summary
Acting Like a Typewriter and File Explorer Chevron down icon Chevron up icon
Acting Like a Typewriter and File Explorer
Introduction
Basic searching for strings and files
Using wildcards and regexes
Math and calculations in script
Striping/altering/sorting/deleting/searching strings with Bash only
Using SED and AWK to remove/replace substrings
Formatting your data/output using echo and printf
Readying your script for different languages with internationalization
Calculating statistics and reducing duplicates based on file contents
Using file attributes with conditional logic
Reading delimited data and altered output format
Understanding and Gaining File System Mastery Chevron down icon Chevron up icon
Understanding and Gaining File System Mastery
Introduction
Viewing files from various angles – head, tail, less, and more
Searching for files by name and/or extension
Creating a diff of two files and patching
Creating symbolic links and using them effectively
Crawling filesystem directories and printing a tree
Finding and deleting duplicate files or directories
Joining and splitting files at arbitrary positions
Generating datasets and random files of various size
Making a Script Behave Like a Daemon Chevron down icon Chevron up icon
Making a Script Behave Like a Daemon
Introduction
Running a program continuously (forever) using looping constructs or recursion
Keeping programs/scripts running after logoff
Invoking commands when they require permissions
Sanitizing user input and for repeatable results
Making a simple multi-level user menu using select
Generating and trapping signals for cleanup
Using temporary files and lock files in your program
Leveraging timeout when waiting for command completion
Creating a file-in-file-out program and running processes in parallel
Executing your script on startup
Scripts for System Administration Tasks Chevron down icon Chevron up icon
Scripts for System Administration Tasks
Introduction
Gathering and aggregating system information
Gathering network information and connectivity diagnostics
Configuring basic network connectivity
Monitoring directories and files
Compressing and archiving files
Rotating files from RAM to storage for log rotation
Using Linux iptables for a firewall
Accessing SQL databases remotely or locally
Creating SSH keys for password less remote access
Creating and configuring cron Jobs for task scheduling
Creating users and groups systematically
Scripts for Power Users Chevron down icon Chevron up icon
Scripts for Power Users
Introduction
Creating Syslog entries and generating an alarm  
Backing up and erasing media, disks, and partitions with DD
Creating graphics and presentations on the CLI
Checking for file integrity and tampering
Mounting network file systems and retrieving files
Browsing the web from the CLI
Capturing network traffic headlessly
Finding binary dependencies
Fetching time from different locations
Encrypting/decrypting files from a script
Writing Bash to Win and Profit Chevron down icon Chevron up icon
Writing Bash to Win and Profit
Introduction
Creating a lame utility HTTP server
Parsing RSS feeds and output HTML
Scraping the web and collecting files
Making a simple IRC chat bot logger
Blocking IP addresses from failed SSH attempts
Playing and managing audio from Bash
Creating a simple NAT and DMZ firewall
Parsing a GitHub project and generate a report
Creating a poor man's incremental remote backup
Using Bash scripts to monitor udev input
Using Bash to monitor battery life and optimize it
Using chroot and restricted Bash shells to secure scripts
Advanced Scripting Techniques Chevron down icon Chevron up icon
Advanced Scripting Techniques
Introduction
Calculating and reducing the runtime of a script
Writing one-line conditional statements and loops
Avoiding command not found warnings/errors and improving portability
Creating a config file and using it in tandem with your scripts
Improving your shell – GCC and command line colors
Adding aliases, and altering user paths/variables
Echoing output to raw terminal devices
Creating simple frontend GUIs for Bash scripts
Compiling and installing your own Bash shell
Recording terminal sessions for automation
Writing high-quality scripts by example
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About the authors

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Profile icon Brash
Brash
Ron Brash is the CTO and co-founder of a successful technology consultancy company that provides services in a multitude of domains, but primarily in FOSS and Linux. For over 7 years, he has worked on embedded systems, which provide security and network connectivity in industrial control systems and SCADA networks, all running an optimized embedded Linux. He participates regularly at FOSS and community events, providing feedback and mini-seminars where appropriate. He loves to share his knowledge.
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Profile icon Ganesh Sanjiv Naik
Ganesh Sanjiv Naik
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Ganesh Sanjiv Naik is an author, consultant, and corporate trainer for embedded Android, embedded Linux, and Internet of Things related product development. He completed his computer engineering in 1988. Since then, he has worked in this industry. He has worked on projects including micro-controller based projects to advanced Embedded Android projects. He has more than 20 years of professional experience and project accomplishment in information technology. Ganesh has a passion and deep desire for teaching. He has trained 1,000 engineers in Linux and Android product development. He has developed a lot of training material as well as curriculum for various universities and training institutes. He has an interest in spiritual study and practices such as meditation. He is a certified yoga teacher. His hobbies include yoga and martial arts. He has worked as a corporate trainer for Indian Space Research Organization, Intel, GE, Samsung, Motorola, Penang Skill Development Center (Malaysia), various companies in Singapore as well as various other corporates in India and other countries. He has started a company called Levana Technologies, which works with the Penang Skill Development Center (Malaysia) for consulting and training activities. If you would like to send feedback, suggestions, or corrections in the book, he can be contacted at https://in.linkedin.com/in/naikganesh. This book is his real-life experience…. He has worked as a consultant and corporate trainer in the following skills: • Internet of Things • Embedded Android, Android internals, and device driver development • USB and PCI device driver development in Linux • Embedded Linux and device driver development • Unix Shell scripting with sed and awk • Embedded C++ and C programming • Operating systems, software engineering, and networking • Problem solving—analysis, reasoning, and solution techniques for software engineers
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Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela