Book Image

Learn Linux Quickly

By : Ahmed AlKabary
Book Image

Learn Linux Quickly

By: Ahmed AlKabary

Overview of this book

Linux is one of the most sought-after skills in the IT industry, with jobs involving Linux being increasingly in demand. Linux is by far the most popular operating system deployed in both public and private clouds; it is the processing power behind the majority of IoT and embedded devices. Do you use a mobile device that runs on Android? Even Android is a Linux distribution. This Linux book is a practical guide that lets you explore the power of the Linux command-line interface. Starting with the history of Linux, you'll quickly progress to the Linux filesystem hierarchy and learn a variety of basic Linux commands. You'll then understand how to make use of the extensive Linux documentation and help tools. The book shows you how to manage users and groups and takes you through the process of installing and managing software on Linux systems. As you advance, you'll discover how you can interact with Linux processes and troubleshoot network problems before learning the art of writing bash scripts and automating administrative tasks with Cron jobs. In addition to this, you'll get to create your own Linux commands and analyze various disk management techniques. By the end of this book, you'll have gained the Linux skills required to become an efficient Linux system administrator and be able to manage and work productively on Linux systems.
Table of Contents (24 chapters)

Spot the difference

You can use the diff command to compare the contents of two files and highlight the differences between them.

To demonstrate, let’s first make a copy of the file facts.txt named facts2.txt:

elliot@ubuntu-linux:~$ cp facts.txt facts2.txt

Now let’s append the line "Brazil is a country." to the file facts2.txt:

elliot@ubuntu-linux:~$ echo "Brazil is a country." >> facts2.txt

Now, run the diff command on both files:

elliot@ubuntu-linux:~$ diff facts.txt facts2.txt 
12a13

> Brazil is a country.

Cool! It outputs the difference between the two files, which in this case, is the line Brazil is a country.