lecture_4 computer software & os
TRANSCRIPT
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Lecture 4Computer Software and OS
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Chapter Contents
Chapter 3: Computer Software2
Software Basics Popular Applications
Buying Software
Installing Software and Uninstalling
Security Software
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Software Categories
Chapter 3: Computer Software3
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Categories of software: Layering
Chapter 3: Computer Software4
The hardware is thecenter
The system softwareoperating system Controls the hardware and
supports the application
Supports GUI (graphics userinterfaces)
Controls communications
Development softwaretools for creating
applications Programming languages Database management
software
Applications softwareThe big area
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Operating System Activities
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An operating system is a type of system softwarethat acts as the master controller for all activities that
take place within a computer system
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User Interfaces
Chapter 4: Operating Systems and FileManagement
6
The combination of hardware and software thathelps people and computers communicate with each
other
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The Boot Process
Chapter 3: Computer Software7
Where is the Os stored?
During the bootprocess, the operatingsystem kernel is loadedinto RAM
The kernel providesessential operatingsystem services
Your computers small
bootstrap program isbuilt into special ROMcircuitry housed in thecomputers system unit
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Todays Operating Systems
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Microsoft Windows
UNIX and Linux
DOS
HandheldOS
Mac OS
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Utility Software
Utility software (a type of
system software) is designedto help you monitor andconfigure settings for yourcomputer system equipment,
the operating system, orapplication software
A desktop widget is aspecialized utility program
that appears on a computersscreen-based desktop
Chapter 3: Computer Software9
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Device Drivers
Chapter 3: Computer Software10
A device driver is softwarethat helps a peripheraldevice establishcommunication with acomputer
This types of systemsoftware is used byprinters, monitors, graphiccards, sound cards,
network cards, modems,storage devices, mice andscanners.
Windows Device Manager
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Question
Chapter 3: Computer Software11
Just about everyone has used iTunes software todownload music. iTunes software also allows youto list the songs youve downloaded, delete
songs, find songs, and organize your music into
play lists. These features of iTunes are similar towhat type of software?
A. Word processing software
B. Spreadsheet software
C. Database software
D. Groupware
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Application Software
Productivity software canbe defined as any type ofapplication software thathas the potential to help
people do their work moreefficiently
Groupware is designed to
help several peoplecollaborate on a singleproject using localnetworks or Internet
connectionsChapter 3: Computer Software12
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Popular Applications
Document ProductionSoftware
Spreadsheet Software
Number CrunchingSoftware
Database Software
Graphics Software
Music Software
Video Editing and DVDAuthoring Software
Educational SoftwareEntertainment Software
Business Software
Chapter 3: Computer Software 13
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Question
Chapter 3: Computer Software14
Suppose you purchase a new computer and itcomes with Microsoft Office installed. After usingthis software for 30 days, it displays a messageindicating that to keep using it, you will have to
pay. This software is an example of all of thefollowing EXCEPT:
A. Proprietary software
B. Open source software
C. Commercial software
D. Demoware
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Consumer Basics
Chapter 3: Computer Software15
Should I use the apps and
utilities that come with theOS?
Most operating systemsinclude a handful of smallapplications and a goodvariety of useful utilitysoftware
What is the advantages ofsoftware suite?
A software suite is a collectionof application software sold as asingle package
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Consumer Basics
Chapter 3: Computer Software16
Where I can get the software??
Available in many types of stores including office stores,computer superstores, electronic stores. Today, mostsoftware is sold online from the software publisher
website
Software contained on distribution media one or moreCSs or DVDs that are packaged in the box withinstruction manual.
Make sure your computer meets the systemrequirements
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Software Copyrights and Licenses
Chapter 3: Computer Software17
A copyright is a form of legal protection that grantsthe author of an original work exclusive rights tocopy, distribute, sell and modify that work. Copyright notice
Software licenses, also called license agreements,
define the ways in which you may use a computerprogram Single-userlimits use to one person at time
Sitecan be used on all comp at specific location
Multiple-userpriced per user and allows the allocatednumber of people use the software
Concurrentpriced per copy and allows a specific numberper copies can be used at the same time
Shrink-wrap
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Software Copyrights and Licenses
Chapter 3: Computer Software18
EULA (End-User License Agreement) displayedon the screen when first install software.
Different types of software licenses Public domain not protected by copyright
because has expired or author has place theprogram in the public domain making it avalilabalewithout restriction
Proprietary restricted on it use that aredelineated by copyright, patents and licenceagreement
Commercial software sold in computer store orat web site
Demoware distributed for free and often comespre-installed on new computers but limited until youpay it trial version
Shareware- copyrighted software marketed under atry-before you buy policy distributed byindependent programmers.
Freeware copyrighted software available for free,
Open source sold and distributed free of chargewith available source code can be modify toimprove the software. Ex. Linux, Open Office
Two most common open Source and free software license:
BSD originated as the Berkeley SoftwareDistribution license for UNIX-like OS
GPL (General Public License) developed for
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TEST YOURSELF
Chapter 3: Computer Software19
1. Most computer operating systems include someapplications and ________ software for file
compression, editing text and making backups
2. Open office and Linux are examples of ______
source software that can legally modified andredistributed.
3. _______ law allows you to make an extra, orbackup, copy of software as long as you do not
defeat any copy protection mechanisms
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Installation Basics
Chapter 3: Computer Software20
Software installation is a
process that places aprogram into a computerso that it can be run orexecuted. Software
requires many files.
Uninstall routines deletethe softwares files from
the various folders onyour computers hard disk
Uninstalling Software
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Question
Chapter 3: Computer Software21
Lets assume that you have antivirus softwareinstalled on your computer and it is up to date.You can trust it to do a pretty good job ofprotecting your computer from viruses and:
A. Bots, worms, Trojans, keyloggers, androotkits
B. RATs, spoofs, and defective Web apps
C. Operating system security holes D. Fake e-commerce sites
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Security Software Basics
Chapter 3: Computer Software22
Security software is designed to protect computersfrom various forms of destructive software and
unauthorized intrusions
The terms malicious software and malware refer to
any computer program designed to secretly enter acomputer, gain unauthorized access to data, ordisrupt normal processing operations
A blended threat describes malware that combines
more than one type of malicious program
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Chapter 3: Computer Software23
Computer virus set of program instructions that attachesitself to a file, reproduces itself and spreads to other file
Computer worm
Mass-mailing worm called Ackantta is hidden in an attachment toan e-mail message thats a fake twitter invitation. Clicking theattachment activates the worm
Trojan horse - impostorsfiles that claim to be somethingdesirable but, in fact, are malicious. Keylogger
Remote Access Trojan (RAT) Bot any software that can automate a task when
commanded to do so. Zombie bad bots because carries out instruction from malicious
Botnet the person who controls many bot-infested computers
can link them together into network Spyware type of program that secretly gathers personal
information without the victims knowledge, usually foradvertising and other commercial purposes
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Antivirus Modules
Chapter 3: Computer Software24
Antivirus software is a type of utility software thatlooks for and eradicates viruses, Trojan horses,
worms, and bots
A virus signature is a section of program code, such as aunique series of instructions, that can be used to identifya known malicious program, much as a fingerprint is used
to identify an individual
Virus signatures and other information that antivirussoftware uses to identify and eradicate malware is stored
in one or more files usually referred to as virus definitions A(n) _____ is a section of program code that can be used
to identify a known malicious program.
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Summary
Chapter 3: Computer Software25
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TEST YOURSELF
Chapter 3: Computer Software26
1. Word processing software and operating systems areexamples of application software.
2. Spreadsheets are classified as utility software.3. The software you install to help a printer communicate
with a computer is called a device driver.
4. A EULA is a license agreement that specifies how tolegally use a software product.
5. Open source software is public domain.6. The Windows Registry is a database that keeps track of
a computers peripheral devices, software, preferences,and settings.
7. Downloaded software is usually zipped to decrease
download time.8. A software worm can replicate itself.
9. Botnets offer effective security protection from spyware.
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SCL QUESTIONS
Chapter 3: Computer Software27
1. Determine advantages and disadvantages of each operating systems:
Mac OS, Windows Vista or 7, Unix , Linux, UbuntuWhich one do you think would be the best for a student. Justify your answer.
2. Your college has decided to negotiate with software publishers to offer students a
bundled of software package at a greatly discounted price. Your group job is to
select the 15 software product for bundle. Your group must make sure the
software effectively meets the major needs of students at your school. Use the
internet resources to look at the range of software available and make yourselections. Arrange your final list into categories like those in Figure3-1 (slide 3)
3. What is an open source software? Why does its popularity increases in these past
few years? State 5 most popular open source software in your opinion and
compare it with its proprietary software counterpart (e.g. Open Office versus
Microsoft Office).(2xA4, Times New Roman, size 12, 1 or 2 spacing, justify, hand in by next lab)