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)

Adding groups

Let's create a group named cartoon. To do that, you need to run the command groupadd cartoon:

root@ubuntu-linux:~# groupadd cartoon

Notice that a new line with the group information will be added to the end of the file /etc/group:

root@ubuntu-linux:~# tail -n 1 /etc/group 
cartoon:x:1009:

Notice that the group cartoon currently has no members, and that's why the fourth field is currently empty.

Let's create another group named developers, but this time, we will specify a GID of 888:

root@ubuntu-linux:~# groupadd --gid 888 developers

Let's check the developers group entry in /etc/group:

root@ubuntu-linux:~# tail -n 1 /etc/group 
developers:x:888:

And it looks just like we expect it to be. Cool!