INTRODUCTION TO LINUX

Introduction:

•  Unix is developed in 1970 in AT&T Laboratories.
•  Linux is Unix like Open Source Operating system developed in 1994.
•  Linux is not derived from Unix its a separate OS.
•  Unix/Linux are multi user operating system i.e.., more than one user can logon at a time. 
•  Example : Ubuntu, RedHat etc..,
•  Shell is the screen you use to interact with the operating system (Graphical or command).
•  ROOT is highest level of anything in Linux.    

             ROOT user is the highest level of user in Linux(Admin). 
             ROOT is the highest file location.
             ROOT is the home directory for a User.

•  Linux is caps specific that means HOME folder is different than Home folder.
•  Operating system will be server and desktop version.
•  Server will not have graphical user interface and minimal applications, desktop versions have  GUI.

Advantages of Linux:
1. Security
2. High Availability - it can run for many days without reboot.
3. Server functionality - Apache web Server, Email Server etc

Disadvantages of Linux:
1. Slow
2. Not user friendly