Linux System-R.D.Sivakumar

1. Video Lecture and E-Content Created by
R.D.SIVAKUMAR,M.Sc.,M.Phil.,M.Tech.,
Assistant Professor of Computer Science &
Assistant Professor and Head, Department of M.Com.(CA),
Ayya Nadar Janaki Ammal College,
Sivakasi – 626 124.
Mobile: 099440-42243
e-mail : sivamsccsit@gmail.com website: www.rdsivakumar.blogspot.in
LINUX SYSTEM

2. Linux is, in simplest terms, an operating system.
It is the software on a computer that enables
applications and the computer operator to access the
devices on the computer to perform desired functions.
 The operating system (OS) relays instructions from an
application to, for instance, the computer's processor.
LINUX DEFINITION

3. Antecedents
Unix – The Unix operating system was
conceived and implemented in 1969 at AT&T’s
Bell Laboratories in the United States by Ken
Thompson, Dennis Ritchie, Douglas McIlroy,
and Joe Ossanna. It was first released in 1971,
and initially, was written entirely in assembly
language.
GNU – The GNU Project, started in 1983 by
Richard Stallman had the goal of creating a
"complete Unix-compatible software system"
composed entirely of free software.
HISTORY OF LINUX

4. MINIX - MINUX is an inexpensive
minimal Unix-like operating system,
designed for education in computer
science, written by Andrew S.Tanenbaum.
Starting with version 3 in 2005, MINIX
became free and was redesigned for
"serious" use.
HISTORY OF LINUX (Conti..)

5. Linux was originally developed as a free operating system
for Intel X86-based personal computers.
 It has since been ported to more computer hardware
platforms than any other operating system
FREE OS

6. A boot loader, for example GNU GRUB or LILO.
An init program. This is the first process launched by the Linux kernel,
and is at the root of the process tree.
Software libraries which contain code which can be used by running
processes.
User interface programs such as command shells or windowing
environments.
COMPONENTS OF LINUX OS

7. PARTS OF LINUX OS
The Kernel - handles memory management, input
and output requests, and program scheduling.
The Shell and Graphical User Interfaces (GUIs) -
basic UNIX shells provides a “command line”
interface which allows the user to type in
commands.
The Built-in System Utilities - are programs that
allow a user to perform tasks which involve
complex actions.
Application Software & Utilities –They are
additional programs that are bundled with the OS
distribution, or available separately. These can
range from additional or different versions of basic
utilities, to full scale commercial applications.

8. STRUCTURE OF LINUX OS

9. UNIX FILE SYSTEM

10. Linux also runs on embedded systems (devices where
the operating system is typically built into the
firmware and highly tailored to the system)
such as mobile phones tablet computers, network
routers, building automation controls, televisions and
video game consoles.
The Android system in wide use on mobile devices is
built on the Linux kernel.
LINUX RUNS

11. Linux is a free open source operating system.
Easy to use.
Almost all applications included in Windows, there have been
alternative in Linux.
Security is more superior than Windows.
Linux is relatively stable.
Security – In line with the costs, the security aspect of Linux is
much stronger than that of Windows.
ADVANTAGES

12. The Hardware support from certain vendors, are not too good to Linux.
The installation process of the software / application that is not as easy as in
Windows.
For the system administrators who are not familiar with Unix-like systems,
inevitably have to learn more about this.
DISADVANTAGES