History of the UNIX OS

7/28/2019 History of the UNIX OS

1/18


2/18


3/18

WHAT IS

UNIX is a computer operating system, controlprogram that works with users to run programs,manage resources, and communicate with other

computer system.

It is a set of enabling technologies first developed atAT&T that have been incorporated into several legallydistinct but closely related operating systems, each of

which can be considered to be a UNIX system. If itlooks like UNIX, operates like UNIX, runs commonUNIX utilities and programs, and is developed with

UNIX as a model, its UNIX.


4/18

THE HISTORY OF UNIX1969 The Beginning

The history of UNIX starts back in 1969, when Ken Thompson,DennisRitchie and others started working on the little-used PDP-7 in a corner at

Bell Labs and what was to become UNIX.


5/18


6/18

THE HISTORY OF UNIX

In the late 1980's through early 1990's : the``wars'' between these two major strains raged. Aftermany years each variant adopted many of the key

features of the other. Commercially, System V wonthe``standards wars'' (getting most of its interfacesinto the formal standards), and most hardware vendorsswitched to AT&T's System V.

The result was many different versions of Unix, allbased on the original seventh edition.


7/18

CHARACTERISTICS OF UNIX

Multitasking capability

Multiuser capability

Portability

UNIX programs

Library of application software


8/18

Multitasking

UNIX lets a computer do several thingsat once, such as printing out one filewhile the user edits another file. This isa major feature for users, since usersdon't have to wait for one application to

end before starting another one.


9/18

Multiusers

The computer can take the commands of anumber of usersdetermined by the design of

the computerto run programs, access files,and print documents at the same time.

lets several users access the same documentby compartmentalizing the document so that

the changes of one user don't override thechanges of another user.


10/18

System portability

UNIX permit to be moved from one brand ofcomputer to another with minimum of codechanges

the operating system could be upgradedwithout having all the customer's datainputted again. And new versions of UNIXwere backward compatible with older

versions, making it easier for companies toupgrade in an orderly manner.


11/18

Unix Program

Unix comes with hundreds of programs thatcan divided into two classes:

Integral utilities that are absolutely necessary

for the operation of the computer such as thecommand interpreter, and Tools that aren'tnecessary for the operation of UNIX butprovide the user with additional capabilities,such as typesetting capabilities and e-mail.


12/18

Applications libraries

there are hundreds of Unix applications thatcan be purchased from third-party vendors, inaddition to the applications that come with

Unix.


13/18

How UNIX is organized

The UNIX system is functionally organized atthree levels:

The kernel, which schedules tasks and

manages storage;The shell, which connects and interprets users'commands, calls programs from memory, andexecutes them;

The tools and applications that offeradditional functionality to the operatingsystem


14/18

UNIX NETWORK SECURITY

ARCHITECTURE

UNIX Network Security Architecture model:

LAYER7 ( POLICY) : POLICY DEFINITION AND DIRECTIVES

LAYER6 (PERSONNEL): PEOPLE WHO USE EQUIPMENT AND

DATA

LAYER5(LAN): COMPUTER EQUIPMENT AND DATA ASSETS

LAYER4(INTERNAL-DEMARK): CONCENTRATOR-INTERNAL

CONNECT

LAYER3 (GATEWAY): FUNCTIONS FOR OSI 7, 6, 5, 4LAYER2 (PACKET-FILTER) : FUNCTIONS FOR OSI 3, 2, 1

LAYER1 ( EXTERNAL-DEMARK): PUBLIC ACCESSEXTERNAL

CONNECT


15/18

HOW TO SECURE YOUR UNIX

COMPUTER NETWORK

Filtering

Prevent SpoofingFTP Security

Modem Security

Verify your work


16/18


17/18

REFERENCE

http://www.networkcomputing.com

http://www.yahoo.com

http://www.whatis.com

http://UNIX review.com

http://www.techweb.com

http://www.boiz.com

A students guide to UNIX by Harley Hahn
http://www.network/http://www.yahoo.com/http://www.whatis.com/http://unix/http://www.techweb.com/http://www.boiz.com/http://www.boiz.com/http://www.techweb.com/http://unix/http://www.whatis.com/http://www.yahoo.com/http://www.network/


18/18

THANK YOU

History of the UNIX OS

Documents

Transcript of History of the UNIX OS