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Linux is designed to serve many users at the same time, and to provide an interface between the users and the computer with its storage media, such as hard disks and tapes. Users have their own shells through which they interact with the operating system, but you may need to configure the operating system itself in different ways. You may need to add new users, devices like printers and scanners, and even file systems. Such operations come under the heading of system administration. The person who performs such actions is referred to as either a system administrator or a superuser. In this sense, there are two types of interaction with Linux: regular users interaction, and the superuser, who performs system administration tasks. The chapters in this book cover operations such as changing system runlevels, managing users, configuring printers, adding file systems, and compiling the kernel. You perform most of these tasks only rarely, such as adding a new printer or mounting a file system. Other tasks, such as adding or removing users, you perform on a regular basis. Basic system administration covers topics such as system access by superusers, selecting the run level to start, system configuration files, and performance monitoring.
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To perform system administration operations, you must 1 first have access rights such as the correct password that enables you to log in as the root user, making you the 1 superuser. Because a superuser has the power to change almost anything on the system, such a password is usually a carefully guarded secret, changed very frequently, and 1 given only to those whose job is to manage the system. With the correct password, you can log in to the system as
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a system administrator and configure the system in different ways. You can start up and shut down the system, as well as change to a different operating mode, such as a single-user mode. You can also add or remove users, add or remove whole file systems, back up and restore files, and even designate the system s name and address. To become a superuser, you log in to the root user account. This is a special account reserved for system management operations with unrestricted access to all components of your Linux operating system. You can log in as the root user from either the GUI (Graphical User Interface) login screen, or from the command line login prompt. You then have access to all administrative tools. Using a GUI interface like Gnome, the root user has access to a number of Red Hat GUI administrative tools, such as redhat-config-packages for installing software or redhat-config-users for managing users. If you log in from the command line interface, you can run corresponding administrative command like rpm to install packages or useradd to add a new user. From your GUI desktop, you can also run commandline administrative tools using a terminal window. The command line interface for the root user uses a special prompt, the sharp sign, #. In the next example, the user logs in to the system as the root user and receives the # prompt. login: root password: #
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As the root user, you can use the passwd command to change the password for the root login, as well as for any other user on the system. The passwd command will check your password with Pluggable Authentication Modules (PAM), as discussed in 2, to see if you ve selected one that can be easily cracked. To more easily change your root password from a GUI interface, you can use the redhat-config-rootpassword tool.
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