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)

User and command aliases

You can use user aliases to reference multiple users in the /etc/sudoers file. For example, you can create a user alias MANAGERS that includes userssmurf and bob as follows:

User_Alias MANAGERS = smurf,bob

You can use a command alias to group multiple commands together. For example, you can create a command alias USER_CMDS that includes the commands useradd, userdel, and usermod:

Cmnd_Alias USER_CMDS = /usr/sbin/useradd, /usr/sbin/userdel, /usr/sbin/usermod

Now you can use both aliases:

MANAGERS ALL=(ALL) USER_CMDS

to grant users smurf and bob the permission to run the commands useradd, userdel, and usermod.