Book Image

Essential Linux Commands

By : Paul Olushile
Book Image

Essential Linux Commands

By: Paul Olushile

Overview of this book

The role of a system administrator is ever-evolving, with the Linux command line at its core. This makes Linux command-line mastery an essential skill to demonstrate your ability to efficiently manage and maintain systems efficiently. Essential Linux Commands addresses a diverse range of topics, including package management, file manipulation, networking strategies, system monitoring, and diagnostic tools. Each command is intricately explained to eliminate any ambiguity, ensuring ease of implementation in real-world scenarios. This book explains how to use SELinux to maintain security, run Linux machines on AWS Cloud, and transfer and download files to remote systems. With the help of practical examples and use cases, you’ll not only gain a thorough understanding of a command’s syntax but also grasp its functional breadth and limitations. The book also explores commands frequently used by system administrators to check network card statistics and firewall rules. Whether you’re a beginner or an experienced administrator, this book is an invaluable resource, filling in the gaps in your skill set and helping you improve your skills and expertise in Linux administration.

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Table of Contents (20 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Conventions used
Get in touch
Share your thoughts
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1
Part 1:Server Installations and Management Commands
Part 1:Server Installations and Management Commands
Free Chapter
2
Chapter 1: Getting a CentOS Server Up and Running
Chapter 1: Getting a CentOS Server Up and Running
Downloading the OS installation file
Downloading and setting up a hypervisor
Package installation commands
Information commands
Summary
3
Chapter 2: Linux User and Group Commands
Chapter 2: Linux User and Group Commands
useradd, userdel, and usermod
Files, directories, and permission commands
groupdel, groupmod, groupadd, and grpck
pwck, chage, and passwd commands
find, locate, and whereis commands
Summary
4
Chapter 3: File Compression and Archival Commands
Chapter 3: File Compression and Archival Commands
gunzip and gzip
tar, rar, and unrar
zip and unzip
bunzip2, bzip2, and more
Summary
5
Part 2:Frequently Used Commands – Part 1
Part 2:Frequently Used Commands – Part 1
6
Chapter 4: Format and Disk Space Commands
Chapter 4: Format and Disk Space Commands
The history and evolution of disk formatting and partitioning in Linux
Steps to create a partition
fdisk, lsblk, df, and du
Displaying (dpkg and rpm) package space
mkfs, mke2fs, fdformat, and more
Summary
7
Chapter 5: Linux Permissions Commands
Chapter 5: Linux Permissions Commands
Why permission commands?
Types of permissions
chmod
chown
Utilizing absolute paths in commands
chgrp
umask
sudo
Summary
8
Chapter 6: Filesystem Mount and Manipulation Commands
Chapter 6: Filesystem Mount and Manipulation Commands
Linux mount commands
The mount command
The umount command
The fuser command
File manipulation using cat, grep, and more
Summary
9
Part 3:Frequently Used Commands – Part 2
Part 3:Frequently Used Commands – Part 2
10
Chapter 7: File Content and Conversion Commands
Chapter 7: File Content and Conversion Commands
The tail and file commands
The convert command
Using dos2unix to convert MS-DOS files to Unix
Using unix2dos to convert Unix files to MS-DOS
The recode command
Summary
11
Chapter 8: Linux SWAP Commands
Chapter 8: Linux SWAP Commands
The swapon command
The free command
Summary
12
Chapter 9: Linux Monitoring and Debugging Commands
Chapter 9: Linux Monitoring and Debugging Commands
The top command
The ps command
The pstree command
The strace command
The watch command
The smartctl command
The uptime command
The lsof command
The lsmod command
The last reboot command
The last command
The w command
The vmstat command
The kill command
The pkill command
Summary
13
Chapter 10: Linux IPTABLES and Network Commands
Chapter 10: Linux IPTABLES and Network Commands
iptables -t ACCEPT
iptables -t DROP
ifconfig, ip, route, and netstat
Hostname and nslookup
host
Summary
14
Chapter 11: File Transfer, Downloading, and Managing Log Files
Chapter 11: File Transfer, Downloading, and Managing Log Files
Copying files into remote systems using netcat and socat
Downloading files with wget and curl
Exploring common log files
Summary
15
Part 4:Linux Security and the Cloud
Part 4:Linux Security and the Cloud
16
Chapter 12: Exploring Linux Security
Chapter 12: Exploring Linux Security
Utilizing enforcing and permissive modes
Enabling or disabling SELinux Boolean values
Locking user accounts
Securing SSH
Summary
17
Chapter 13: Linux in the Cloud
Chapter 13: Linux in the Cloud
Creating EC2 instances on AWS
Connecting to a created EC2 instance using PuTTY
Working on our EC2 instance
Summary
18
Index
Index
Why subscribe?
19
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Preface

Hello there! In our rapidly changing world of technology, it is essential to learn and understand the Linux command-line interface. The Linux operating system (OS), known for its robustness, versatility, and open source nature, has become an integral part of modern computing.

Essential Linux Commands is your gateway to this dynamic world of command-line proficiency. Whether you’re a seasoned system administrator, a developer, or simply someone eager to explore the power of Linux, this book offers a comprehensive and accessible guide to the fundamental tools that make Linux tick.

Linux commands are the unsung heroes, silently but efficiently performing tasks ranging from managing files to configuring networks, securing systems, and optimizing performance. Each command is a valuable tool in your arsenal, capable of simplifying complex operations and automating routine chores.

As our digital landscape continues to transform, understanding Linux commands becomes a fundamental skill. With this book, you’ll not only acquire the technical knowledge to navigate the Linux environment but also the confidence to tackle real-world challenges.

The beauty of Linux commands lies in their universal applicability. They are equally relevant to individuals working on personal projects and professionals overseeing complex enterprise-level infrastructure. The knowledge gained from this book will empower you to efficiently manage and manipulate Linux-based systems.

The book provides in-depth explanations, practical examples, and valuable insights, ensuring that you gain both the technical proficiency and the practical wisdom needed to excel in the world of Linux.

Just as the world of Linux commands continues to grow and evolve, this book is designed to grow with you, offering an essential foundation for Linux mastery.

So, as we embark on this journey through Essential Linux Commands, prepare to unlock the full potential of Linux and transform the way you interact with the digital world. Whether you’re venturing into Linux for the first time or seeking to enhance your existing skills, this book is your key to becoming a proficient Linux command-line user.

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