Linux Command Line and Shell Scripting Techniques: Master practical aspects of the Linux command line and then use it as a part of the shell scripting process

by Jasmin Redzepagic, Vedran Dakic

Length: 552 pages
Edition: 1
Language: English
Publisher: Packt Publishing
Publication Date: 2022-03-24
ISBN-10: 1800205198
ISBN-13: 9781800205192
Sales Rank: #0 (See Top 100 Books)

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ractical and actionable recipes for using shell and command-line scripting on your Linux OS with confidence

Key Features

Learn how to use the command line and write and debug Linux Shell scripts
Automate complex repetitive tasks and backups, and learn networking and security
A practical approach to system administration, and virtual machine and software management

Book Description

Linux Command Line and Shell Scripting Techniques begins by taking you through the basics of the shell and command-line utilities. You’ll start by exploring shell commands for file, directory, service, package, and process management. Next, you’ll learn about networking – network, firewall and DNS client configuration, ssh, scp, rsync, and vsftpd, as well as some network troubleshooting tools.

You’ll also focus on using the command line to find and manipulate text content, via commands such as cut, egrep, and sed. As you progress, you’ll learn how to use shell scripting. You’ll understand the basics – input and output, along with various programming concepts such as loops, variables, arguments, functions, and arrays. Later, you’ll learn about shell script interaction and troubleshooting, before covering a wide range of examples of complete shell scripts, varying from network and firewall configuration, through to backup and concepts for creating live environments. This includes examples of performing scripted virtual machine installation and administration, LAMP (Linux, Apache, MySQL, PHP) stack provisioning and bulk user creation for testing environments.

By the end of this Linux book, you’ll have gained the knowledge and confidence you need to use shell and command-line scripts.

What you will learn

Get an introduction to the command line, text editors, and shell scripting
Focus on regular expressions, file handling, and automating complex tasks
Automate common administrative tasks
Become well-versed with networking and system security scripting
Get to grips with repository management and network-based file synchronization
Use loops, arguments, functions, and arrays for task automation

Who this book is for

This book is for anyone looking to learn about Linux administration via CLI and scripting. Those with no Linux command-line interface (CLI) experience will benefit from it by learning from scratch. More experienced Linux administrators or engineers will also find this book useful, as it will help them organize their knowledge, fill in any gaps, and work efficiently with shell scripts to increase productivity.

Linux Command Line and Shell Scripting Techniques
Contributors
About the authors
About the reviewers
Preface
    Who this book is for
    What this book covers
    To get the most out of this book
    Download the color images
    Conventions used
    Get in touch
    Share Your Thoughts
Chapter 1: Basics of Shell and Text Terminal
    Technical requirements 
    Accessing the shell
        Getting ready
        How to do it…
        How it works…
        See also
    Setting up the user shell
        Getting ready
        How to do it…
        How it works…
    Setting up the Bash shell 
        Getting ready
        How to do it…
        How it works…
        There's more…
    Using the most common shell commands
        Getting ready
        How to do it…
        How it works...
    Using screen 
        Getting ready
        How to do it…
        How it works…
        There's more…
Chapter 2: Using Text Editors
    Technical requirements 
    Learning the basics of the Vi(m) Editor 
        Getting ready
        How to do it…
        How it works…
        See also
    Learning the basics of the nano editor
        Getting ready
        How to do it…
        There's more…
    Going through the advanced Vi(m) settings
        Getting ready
        How to do it…
        How it works…
        There's more…
Chapter 3: Using Commands and Services for Process Management
    Technical requirements 
    Process management tools
        Getting ready
        How to do it…
        How it works…
        See also
    Managing background jobs
        Getting ready
        How to do it…
        How it works…
        There's more…
    Managing process priorities
        Getting ready
        How to do it…
        How it works…
        There's more…
    Configuring crond
        Getting ready
        How to do it…
        How it works…
        There's more…
Chapter 4: Using Shell to Configure and Troubleshoot a Network
    Technical requirements 
    Using nmcli and netplan
        Getting ready
        How to do it
        How it works
        There's more
    Using firewall-cmd and ufw
        Getting ready
        How to do it
        How it works
        There's more
    Working with open ports and connections
        Getting ready
        How to do it
        How it works
        There's more
    Configuring /etc/hosts and DNS resolving
        Getting ready
        How to do it
        How it works
        There's more
    Using network diagnostic tools
        Getting ready
        How to do it
        How it works
        There's more
Chapter 5: Using Commands for File, Directory, and Service Management
    Technical requirements 
    Basic file and directory-based commands
        Getting ready
        How to do it…
        How it works…
        See also
    Additional commands for manipulating file/directory security aspects
        Getting ready
        How to do it…
        How it works…
        See also
    Manipulating text files by using commands
        Getting ready
        How to do it…
        How it works…
        There's more…
    Finding files and folders
        Getting ready
        How to do it…
        How it works…
        There's more…
    Archiving and compressing files and folders
        Getting ready
        How to do it…
        How it works…
        There's more…
    Managing services and targets
        Getting ready
        How to do it…
        How it works…
        There's more…
Chapter 6: Shell-Based Software Management
    Technical requirements 
    Using dnf and apt for package management
        Getting ready
        How to do it…
        How it works…
        There's more…
    Using additional repositories, streams, and profiles
        Getting ready
        How to do it…
        How it works…
    Creating custom repositories
        Getting ready
        How to do it…
        How it works…
        There's more…
    Compiling third-party software
        Getting ready
        How to do it…
        How it works…
        There's more…
Chapter 7: Network-Based File Synchronization
    Technical requirements 
    Learning how to use SSH and SCP
        Getting ready
        How to do it…
        How it works…
        There's more…
    Learning how to use rsync
        Getting ready
        How to do it…
        How it works…
        There's more…
    Using vsftpd
        Getting ready
        How to do it…
        How it works…
        There's more
Chapter 8: Using the Command Line to Find, Extract, and Manipulate Text Content
    Technical requirements 
    Using text commands to merge file content
        Getting ready
        How to do it…
        How it works…
        There's more…
    Converting DOS text to Linux text and vice versa
        Getting ready
        How to do it…
        How it works…
        There's more…
    Using cut
        Getting ready
        How to do it…
        How it works…
        There's more…
    Using egrep
        Getting ready
        How to do it…
        How it works…
        There's more…
    Using sed
        Getting ready
        How to do it…
        How it works…
        There's more…
Chapter 9: An Introduction to Shell Scripting
    Technical requirements 
    Writing your first Bash shell script
        Getting ready
        How to do it…
        How it works…
    Serializing basic commands – from simple to complex
        Getting ready
        How to do it…
        How it works…
        There's more…
    Manipulating shell script input, output, and errors 
        Getting ready
        How to do it…
        How it works…
    Shell script hygiene
        Getting ready
        How to do it…
        There's more…
Chapter 10: Using Loops
    The for loop
        Getting ready
        How to do it…
        How it works…
        See also
    break and continue
        Getting ready
        How to do it…
        How it works…
        See also
    The while loop
        Getting ready
        How to do it…
        How it works…
        See also
    The test-if loop
        Getting ready
        How to do it…
        How it works…
        See also
    The case loop
        Getting ready
        How to do it…
        How it works…
        See also
    Logical looping with and, or, and not 
        Getting ready
        How to do it…
        How it works…
        See also
Chapter 11: Working with Variables
    Technical requirements 
    Using shell variables 
        Getting ready
        How to do it…
        How it works…
        See also
    Using variables in shell scripting 
        Getting ready
        How to do it…
        How it works…
        See also
    Quoting in the shell 
        Getting ready
        How to do it…
        How it works…
        See also
    Performing operations on variables 
        Getting ready
        How to do it…
        How it works…
        See also
    Variables via external commands 
        Getting ready
        How to do it…
        How it works…
        See also
Chapter 12: Using Arguments and Functions
    Technical requirements 
    Using custom functions in shell script code
        Getting ready
        How to do it…
        How it works… 
        See also
    Passing arguments to a function 
        Getting ready
        How to do it…
        How it works…
        See also
    Local and global variables
        Getting ready
        How to do it…
        How it works…
        See also
    Working with returns from a function
        Getting ready
        How to do it…
        How it works…
        See also
    Loading an external function to a shell script
        Getting ready
        How to do it…
        How it works…
        See also
    Implementing commonly used procedures via functions
        Getting ready
        How to do it…
        How it works…
        See also
Chapter 13: Using Arrays
    Technical requirements 
    Basic array manipulation
        Getting ready
        How to do it…
        How it works…
        See also
    Advanced array manipulation
        Getting ready
        How to do it…
        How it works…
        See also
Chapter 14: Interacting with Shell Scripts
    Technical requirements 
    Creating text-based interactive scripts
        Getting ready
        How to do it…
        How it works…
        See also
    Using expect to automate repetitive tasks based on text output
        Getting ready
        How to do it…
        How it works…
        See also
    Using dialog for menu-driven interactive scripts
        Getting ready
        How to do it…
        How it works…
        See also
Chapter 15: Troubleshooting Shell Scripts
    Technical requirements 
    Common scripting mistakes
        Getting ready
        How to do it…
        How it works…
        See also…
    Simple debugging approach – echoing values during script execution
        Getting ready
        How to do it…
        How it works…
        See also
    Using the bash -x and -v options
        Getting ready
        How to do it…
        How it works…
        See also…
    Using set to debug a part of the script
        Getting ready
        How to do it…
        How it works…
        See also…
Chapter 16: Shell Script Examples for Server Management, Network Configuration, and Backups
    Technical requirements 
    Creating a file and folder inventory
        How to do it…
        See also
    Checking if you're running as root
        Getting ready
        How to do it…
        See also
    Displaying server stats
        Getting ready
        How to do it…
        There's more…
    Finding files by name, ownership, or content type and copying them to a specified directory
        Getting ready
        How to do it…
        There's more…
    Parsing date and time data
        Getting ready
        How to do it…
    Configuring the most common firewall settings interactively
        Getting ready
        How to do it…
        There's more…
    Configuring network settings interactively
        Getting ready
        How to do it…
        There's more…
    Backing up the current directory with shell script arguments and variables
        Getting ready
        How to do it…
        There's more…
    Creating a current backup based on the user input for the backup source and destination
        Getting ready
        How to do it…
        There's more…
Chapter 17: Advanced Shell Script Examples
    Technical requirements 
    Implementing a web server service and security settings
        Getting ready
        How to do it…
        See also
    Creating users and groups and forcing users to change them on the next login
        Getting ready
        How to do it…
        See also
    Creating users and groups from a standardized input file and a random password for each user
        Getting ready
        How to do it…
        See also
    Scripted VM installation on KVM
        Getting ready
        How to do it…
        See also
    Using a shell script to provision SSH keys
        Getting ready
        How to do it…
        See also
    A shell script for VM administration
        Getting ready
        How to do it…
        See also
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