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intro unix/linux 01


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logging on to the system

logging on to the system

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  • 1. Lesson 1-Logging On to the System
  • 2. Overview
    • Importance of UNIX/Linux.
    • Logging on to the system.
  • 3. 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.
  • 4. 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.
  • 5. 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.
  • 6.
    • 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
  • 7. Logging On to the System Character Window Log On Screen
  • 8. Logging On to the System Terminal Window Log on Screen
  • 9. 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.
  • 10.
    • 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
  • 11. Logging On to the System
    • Terminal Window interaction
    • Graphical Window interaction
  • 12. Terminal Window Interaction Terminal Window Screen
  • 13. 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.
  • 14. Graphical Window Interaction Graphical Window Screen
  • 15. Graphical Window Interaction Logoff in Graphical Window Interface
  • 16. 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.