One of the more fundamental and important tasks of administering a Linux system is setting up and supporting user accounts. Computers, after all, are tools to be used by people. Apocalyptic science fiction plots aside, computers have no purpose without users.
When you install CentOS, you are required to create the
root (administrator) user account. The first time you boot the system, you are asked to create a regular user account, using any name you choose. Several other administrative user accounts that you will probably never use directly are set up automatically, such as
apache, rpm, and
For a description of the
root user account and how to use it, see Chapter 9.
This chapter discusses the basics of setting up user accounts and offers tips on easing the burden of supporting a large number of Linux users.
Every person who uses your CentOS system should have a separate user account. Having a user account provides each person with an area in which to securely store files. A user account also defines which files and directories a user is permitted to create, modify, or delete throughout the computer's file system.
Some user accounts are already there when you install your Linux system. Administrative users (user IDs 0–499 are used) ...