SUSE Linux 10.0 Unleashed

Unix was born in a multiuser environment at Bell Labs and was widely used in university computer science labs with a bunch of students floating in and out using whatever terminal was available. Defining users in a system was a necessity in the early days of Unix. As more users came on to systems with the advent of the PC, requiring users to log in was the touchstone of security measures. Today, because of viruses, worms, and assorted evildoers trying to break into networks almost constantly, named users and passwords are essential elements in any secure computing environment.

The Root user, who is responsible for all administrative tasks on the system, creates an account for each user. This involves assigning a username and creating an initial password for that user. You created the first user account for your system during the installation in Chapter 3, "Installing SUSE Linux."

The Root user can delegate responsibilities to a single user or a group of users by sharing the Root password. Those users can then run the SuperUser program (su) to act as the Root user. You will learn more about SuperUsers in Chapter 19.

Individual users cannot change their usernames. System administrators of large user communities like to have some consistency in usernames, especially considering that a username is a central element of that user's email address. Users can, however, change the information associated with their name and contained with your other login information in /etc/passwd and in your public "finger" file. This is generally phone-directory information that may need to be public, but that otherwise may be an artifact of a bygone era.

Finger was a program developed to help Unix users find each other, both electronically and physically. Typing finger <username> delivered whatever was in that user's finger file. To see what's in yours, type chfn (change finger information) at the shell prompt. By default, SUSE Linux does not create additional user information with new users, but it is easily configured by Root. You'll see something like this:

Name: Office: Office Phone: Home Phone:

You're led through a series of prompts to enter new or updated information. Feel free to leave items blank (or change them appropriately).