REDHAT Linux A.K.SINGH

OVERVIEW operating system what is linux history of linuxwhy linux is so popular why we use linux advantages/disadvantages of using

linuxThe Business of Linux Is Linux Hard to learn ??My vision

What is osoperating system is program or in common term a software. A software or program which manage your computer hardware resource and provide interface to run your other program

What is linuxLinux is a very popular Unix like

operating system. Linux was first released in 1994 with version # 1.0. Linux is a multi-tasking and multi-user operating system

History of linux

GNU project• Established in 1984 by Richard

Stallman, who believes that software should be free from restrictions against copying or modification in order to make better and efficient computer programs

Beginning of LinuxA famous professor Andrew Tanenbaum

developed Minix, a simplified version of UNIX that runs on PC

Minix is for class teaching only. No intention for commercial use

In Sept 1991, Linus Torvalds, a second year student of Computer Science at the University of Helsinki, developed the preliminary kernel of Linux, known as Linux version 0.0.1

Linus Torvalds Linus Torvalds is credited with creating the Linux Kernel in 1991 with the assistance of developers around the world. Linus

Torvalds was born on December 28, 1969 and was enrolled at the University of Helsinki in 1988 where he studied computer science.

In the book Just For Fun: Linus Torvalds Biography, The Story Of An Accidental Revolutionary by Linus Torvalds and David Diamond, Torvalds says that Linux was created because he was "curious to see if he could improve upon the operating systems already out there".

KernelCore or nucleus of an operating

systemInteracts with the hardwareFirst program to get loaded when

the system starts and runs till the session gets terminated

Different from BIOS which is hardware dependent.

Kernel is software dependent

ShellProgram that interacts with kernel

Bridge between kernel and the user

Command interpreterUser can type command and the command is conveyed to the kernel and it will be executed

Operating System

Hardware RequirementsCan run on very minimal hardwareRecommend that computer have

minimum of:1 GB of free disk space 64 MB of RAM

For Red Hat Enterprise Linux installations:256 MB of RAM300 MHZ CPU800 MB of free disk space

why linux is so popular

So popular…...

Linux is very popular, simple reason behind this is Linux is very powerful. But just think why?

Main reason behind Linux power and popularity is it open source nature

If the product is initially good and opensource then people can take it, modify it and use as per it own way

open sourceFree software” is a matter of liberty, not price. To

understand the concept, you should think of “free” as in “free speech”, not as in “free beer”.

Free software is a matter of the users' freedom to run, copy, distribute, study, change and improve the software. More precisely, it refers to four kinds of freedom, for the users of the software:

The freedom to run the program, for any purpose The freedom to study how the program works, and

adapt it to your needs . Access to the source code is a precondition for this.

The freedom to redistribute copies so you can help your neighbor.

The freedom to improve the program, and release your improvements to the public, so that the whole community benefits. Access to the source code is a precondition for this.

Low costYou don’t need to spend time and money to

obtain licenses since Linux and much of its software come with the GNU General Public License. You can start to work immediately without worrying that your software may stop working anytime because the free trial version expires. Additionally, there are large repositories from which you can freely download high quality software for almost any task you can think of.

StabilityLinux doesn’t need to be rebooted

periodically to maintain performance levels. It doesn’t freeze up or slow down over time due to memory leaks and such. Continuous up-times of hundreds of days (up to a year or more) are not uncommon.

PerformanceLinux provides persistent high performance

on workstations and on networks. It can handle unusually large numbers of users simultaneously, and can make old computers sufficiently responsive to be useful again

Fast and easy installationMost Linux distributions come with user-

friendly installation and setup programs. Popular Linux distributions come with tools that make installation of additional software very user friendly as well.

Multitasking

ChoiceThe large number of Linux distributions

gives you a choice. Each distribution is developed and supported by a different organization. You can pick the one you like best; the core functionalities are the same; most software runs on most distributions.

Distibution of linux

Dis…. Of Linux Linux community is very big. So

many people comes with ideas of improvement and lost of people involve in implementing good ideas. This is the big big reason for the growth and popularity of Linux operating system.

few popular Linux distributions

CentOSFedoraSuse LinuxUbuntuRed Hat Enterprise Linux

Linux Vs Windows OS

Linux was established in 1971 while Microsoft came into being in around in 1975. Both the companies are supplying and catering to the same market. However then why there is a huge difference in market share of these software giants.

The most obvious reason is that Linux based its early target market on servers only while left a wide gap for Microsoft to avail the market segment of home users. This is the reason that now Microsoft accounts for total 90% market share while leaving only 10 to 12% for Linux.

Key features of Linux Giving it Edge over Microsoft

Putting aside the market share if we try to analyze the feature and performance of Windows and Linux we would end up giving more points to Linux

There many reasons which would support my argument. First and the foremost reason is that Linux is a very low cost choice while Windows on the other hand is burden on one’s pocket

Most promising edge of Linux is that it is highly secure against Malware threats. Whereas most of the windows OS are blamed for the poor security

conti….

Microsoft and Linux Are still, the two most popular operating Systems..

Linux is Cheaper

Main Disadvantages of using Linux

Linux is an open source operating system which has not released any standard edition so far. There are many variations of Linux which makes it harder for the ultimate buyer to choose the best one. It is really difficult for the new users to use and work well with the Linux OS

Disadvantages….. its interface is not that user

friendly. One has to get used to it in order to operate it well

Linux is not really popular this is the reason why it is really difficult to find solution to the problems

Disadvantages….. Linux is an open source operating system

which provides its users the maximum flexibility to use and modify the code according to their choice. However, who is that users who knows to modify the code. Definitely they are trained professionals and network administrators who have expertise and skills to understand and modify codes. Therefore one can say that Linux is not an OS for layman and common person

An abbreviated list of some of the popular electronic devices Linux is used on today

includes:

Dell Inspiron Mini 9 and 12

Google Android Dev Phone 1

HP Mini 1000

Lenovo IdeaPad S9

Motorola MotoRokr EM35 Phone

One Laptop Per Child XO2

Sony Bravia Television

Sony Reader

TiVo Digital Video Recorder

Volvo In-Car Navigation System

Yamaha Motif Keyboard These are just the most recent examples of Linux-based devices available to consumers worldwide. This actual number of items that use Linux numbers in the thousands.

The Business of Linux

Today, Linux is a multi-billion dollar industry, with companies and governments around the world taking advantage of the operating system's security and flexibility. Thousands of companies use Linux for day-to-day use, attracted by the lower licensing and support costs. Governments around the world are deploying Linux to save money and time, with some governments commissioning their own versions of Linux.

The Business of Linux……

In 2008, IDC analyst Al Gillen cited a nearly 24 percent annual growth rate for the Linux industry, which puts a $21 billion 2007 technology at $49 billion in 2011. The companies involved in Linux include industry leaders such as IBM, Fujitsu, Hewlett-Packard, Oracle, Intel, Hitachi, NEC, and Novell. All have all invested time, talent, and resources to bettering Linux on their own and through the Linux Foundation.

Redhat certifications

….Red Hat Certified System Administrator (RHCSA)Red Hat Certified Engineer (RHCE)Red Hat Certified Security Specialist (RHCSS)Red Hat Certified Datacenter Specialist (RHCDS)Red Hat Certified Virtualization Administrator (RHCVA)Red Hat Certified Architect (RHCA)Red Hat Certified JBoss Administration (RHCJA)Red Hat Certified JBoss Developer (RHCJD)For more

info.-http://en.wikipedia.org/wiki/Red_Hat_Certification_Program

For more about redhat certification

http://www.redhat.com/

training/certifications/

Careers in LinuxSystem administrator Network administrator Software engineerTrainer Technical writer Product marketing Business consultant

Linux is as easy as typing something on notepad

Is Linux Hard to learn ??

My visionI worked on many editions of Windows. Windows

(all editions) is costly operating system with lots of vulnerabilites and errors but yet it is famous because it is easy to use, stable & durable. For Windows you must have an Anti virus software (You have to purchase it separately) installed or your system will get infected by virus, etc. Also you should have MS Office Software to create documents, excel sheet, etc (You also have to purchase it separately, another shock on your pocket). So now the Windows costs you around half the price of your Computer.

My vision….But then why we should switch on to Linux?

Answer is that it is "FREE". More Companies provide it free of cost & you are even free to modify, distribute.Linux is free from most of Viruses & it is secure. Actually 95% of Viruses are designed for Windows (one of the reason is that all Windows editions are 'paid' where as Linux is free).