Manual Suse openSUSE 11.3 (page 84 of 178) (English)

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For your daily work, you usually log in to your system as normal user. Performing

some administrative tasks or running certain programs such as YaST requires root

permissions. You can easily switch from your normal account to root and back to

your normal user account after accomplishing the administrative task. How to do so

in a shell is described in Section 7.4, “Becoming Root” (page 93). If you are working

with a graphical user interface you are usually prompted to enter the root password

when necessary. Closing the application which required root permissions results in

withdrawal of the root privileges: you automatically switch back to your normal user

account.

While this concept might not look very appealing at rst, it adds to security. A user

without root privileges cannot damage the entire system. Any damage caused is

strictly limited to the user's own account and data. Any operation executed with root

privileges may potentially harm the entire system. Anyone intending to harm a running

Linux system must gain root privileges rst. This is why it is much harder to create

viruses for Linux systems. They must overcome the root barrier rst.

6.1.2 Groups

Every user in a Linux system belongs at least to one group. A group, in this case,

can be dened as a set of connected users with certain collective privileges. Groups

are usually dened according to functional roles or the data and resources the

members of the group need to access. When a new user account is created on your

system, the user is usually assigned to a default, primary group. The system admin-

istrator can change this primary group or assign the user to an additional group, if

necessary.

Figure 6.1 Group Membership for a User in YaST

74 Start-Up

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Suse openSUSE 11.3 Manual

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