Slide 1 : LINUX KOLLA SANJEEVA RAO MCA
Slide 2 : INTRODUCTION
DEFINITION Operating System is a collection of programs that coordinates the operation of computer hardware& software. : DEFINITION Operating System is a collection of programs that coordinates the operation of computer hardware& software. What is Operating System ?
Functions of Operating System : Functions of Operating System Process Management
Memory Management
Data Management
I/O Management
Linux Architecture : Linux Architecture Linux Architecture Consists of
1. Hardware
2. Kernel
3. Shell
4. Other Programs
Linux Architecture : Linux Architecture
What is Kernel ? : What is Kernel ? A set of functions that make up the heart of an OS. It is used to provide an application interface
between programs and physical devices.
Services provided by the kernel
Controls execution of processes.
Scheduling processes fairly for execution on the CPU.
Allocating memory for an executing process.
What is Shell ? : What is Shell ? Shell is the interface between the user
and the kernel.
Services provided by the shell
It interprets all the commands to the kernel
The kernel after processing the commands gives back to the shell.
How Linux Architecture works? : How Linux Architecture works?
History of Unix : History of Unix MULTICS PROJECT
It was started in 1965 on Main frame GE 645 by the joint effort of
AT & T Bell Labs
General Electrical
Massachusetts Institute of Technology (MIT)
Multics was written in Assembly Language
In 1969 Multics project was dropped.
History of Unix : History of Unix In 1969, Ken Thompson & Dennis Ritchie at BellLabs
AT&T redesigned the Multics and introduced
New OS UNICS (Uniplexed Information &
computing system)
It is written in 80 percent of C language and 20percent assembly language.
Later on totally rewritten in C language and named as UNIX (1973 ).
Flavors of UNIX : Flavors of UNIX
UI & OSF : UI & OSF
Slide 14 : In 1988, AT&T shocked the UNIX community by purchasing a percentage of Sun Microsystems which became a threat for other vendors.
So, other vendors quickly formed a consortium group called OSF and former formed their group named UI. History of Unix Unisys Data General Sun AT & T
UI (Unix International) UI & OSF
Features of Linux : Features of Linux Open Source - Free
Multitasking
Multi-User
Portable
Scalability
Reliability
Biggest servers on this planet running Linux withoutsingle second of downtime from last 10yrs Security
Inbuilt firewall (ip tables)
History of Linux : History of Linux In 1990 s, Linus Torvalds ,a graduate student form University of Helsinky designed a UNIX like kernel on 386 Intel machine and gave this to OSF.
Linux Kernel was bundled with many software's from various distributors and it gave rise to many
flavors of LINUX.
Linux Distribution : Linux Distribution