Book Image

Linux for System Administrators

By : Viorel Rudareanu, Daniil Baturin
Book Image

Linux for System Administrators

By: Viorel Rudareanu, Daniil Baturin

Overview of this book

Linux system administration is an essential aspect of maintaining and managing Linux servers within an organization. The role of a Linux system administrator is pivotal in ensuring the smooth functioning and security of these servers, making it a critical job function for any company that relies on Linux infrastructure. This book is a comprehensive guide designed to help you build a solid foundation in Linux system administration. It takes you from the fundamentals of Linux to more advanced topics, encompassing key areas such as Linux system installation, managing user accounts and filesystems, networking fundamentals, and Linux security techniques. Additionally, the book delves into the automation of applications and infrastructure using Chef, enabling you to streamline and optimize your operations. For both newcomers getting started with Linux and professionals looking to enhance their skills, this book is an invaluable hands-on guide with a structured approach and concise explanations that make it an effective resource for quickly acquiring and reinforcing Linux system administration skills. With the help of this Linux book, you’ll be able to navigate the world of Linux administration confidently to meet the demands of your role.
Table of Contents (21 chapters)
Part 1: Linux Basics
Part 2: Configuring and Modifying Linux Systems
Part 3: Linux as a Part of a Larger System

Managing account passwords

If you remember correctly, the passwd command enables us to alter the password for the user who is now logged in to the system. In addition, we are able to change the password for any user account on our system by running the passwd command while logged in as root and providing the username. However, that is only one of the capabilities of this command.

Locking/unlocking user accounts

The ability to lock and unlock a user account is one feature of the passwd command that we have not yet discussed. You can use this command to do either of these things. There are lots of different use cases where you need to accomplish something like this. For example, if a person is going to be gone for a lengthy period of time, you might want to lock their account so that it is inaccessible to other users during that time.

Use the -l option when you want to lock an account. For example, to lock the account for the packt user, we use the following command: