Objectives
In this chapter you will learn
How user accounts and groups are used to provide access and security
The function and structures of the passwd, group, and shadow files in /etc
To add and delete user accounts using basic useradd and userdel commands
To add and delete user accounts manually
To create user-level configurations that replicate for new users
To lock a user account
The difference between login shells and nologin shells
Introduction
You are probably asking why I waited so long to talk about managing users. The answer is that many Linux systems today are essentially single-user systems. ...
