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logging on to the system
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Lesson 1-Logging On to the System
Overview
Importance of UNIX/Linux.
Logging on to the system.
Importance of UNIX/Linux
Most Internet servers and all the fundamental computing
structures run on UNIX/Linux systems.
Most communication networks run on UNIX/Linux systems.
The general infrastructure for communications, programs,
smart devices, and critical data is managed on UNIX/Linux
systems.
Importance of UNIX/Linux
Records, research, communication, development, and
publications depend on applications provided by UNIX/Linux
systems.
File serving for desktops, e-mail, and an enormous portion
of publishing run in UNIX/Linux environments.
Logging On to the System
The UNIX system’s ability to serve multiple users at a time
is one of its primary features.
A unique account associated with a login name is created
when an administrator adds a new user to a system.
Entry to the UNIX system is granted only if the user
provides a login name and a password that match an
established user on the system.
A user having a ‘root’ login is granted the extensive powers
needed to administer the system.
Logging On to the System
Logging On to the System
Character Window Log On Screen
Logging On to the System
Terminal Window Log on Screen
Logging On to the System
Ensure that the username and password is entered using
the correct character-case, since UNIX/Linux is case-
sensitive.
In most systems, the login name and the password are in
lowercase letters.
Passwords are not displayed on the screen.
Care should be taken to avoid typing mistakes.
Confusion between similar looking characters should also
be avoided. For example, the alphabet O and the number
zero (0).
Logging On to the System
Logging On to the System
Terminal Window interaction
Graphical Window interaction
Terminal Window Interaction
Terminal Window Screen
Terminal Window Interaction
The “date” command is used to display the current date
and time.
The “exit” command is used to log off from the terminal
environment.
Graphical Window Interaction
Graphical Window Screen
Graphical Window Interaction
Logoff in Graphical Window Interface
Summary
A valid username and a password are required to access a
UNIX/Linux system.
The root user has the extensive powers needed to
administer a UNIX/Linux system.
A user can log in from the terminal Window or the graphical
Window.
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