Operating system
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Transcript of Operating system
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Operating Systems and Utility Programs
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Computer Software
Computer Software
Set of instructions…
1- System software
i ) Operating System
ii ) Utility Programs
2- Application software
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Computer Software
What is system software?• Programs that control the operations of the
computer and its devices
Operating System (OS)
Utility Programs
p. 1.12
Next
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OperatingOperatingSystemSystem
Operating Systems
What is an operating system (OS)?• Set of programs
that coordinates all activities among computer hardware resources
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Operating Systems
What are the functions of an operating system?
start up the computer
administer security
control a network
access the Web
start up the computer
administer security
control a network
access the Web
monitor performanceand provide housekeepingservices
schedule jobs andconfigure devices
monitor performanceand provide housekeepingservices
schedule jobs andconfigure devices
manage memory
manage programs
provide user interface
manage memory
manage programs
provide user interface
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Operating Systems
Where is the operating system located?
operating system resides on hard
disk in most cases
operating system resides on ROM
in handhelds
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Operating System Functions
What is booting?
• Process of starting or restarting a computer
cold bootProcess of turning on a
computer after it has been powered off completely
warm bootProcess of restarting a
computer that is already powered on
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Recov
ery
Disk
Operating System Functions
What is an emergency recovery disk? • Floppy disk that contains system files that will start
computer when hard disk becomes damaged and computer cannot boot
• Also called repair disk, boot disk,or rescue disk
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• Controls how you enter data and instructions and how information displays on screen
Operating System Functions
What is a user interface?
command-line (DOS) interface
graphical (Windows) interface
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Operating System Functions
What is multitasking? • Allows single user to work on two or more
applications that reside in memory at same time Foreground
contains active application - the one you currently are using
Background contains inactive programs that are running but are not in use
background applications
listed on taskbar
background applications
listed on taskbar
foreground application
foreground application
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Operating System Functions
multiuserOperating system enables two
or more users to run a program simultaneously
multiprocessingOperating system can support
two or more processors running programs at same time
fault-tolerant computerContinues to operate even if one of its
components fails
Computer has duplicate components such as processors, memory, and
disk drives
What are other program management features of operating systems?
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RAM (physical memory)
disk (virtual
memory)
page swapped out
RAM (physical memory)
disk (virtual
memory)
Operating System Functions
What is virtual memory (VM) management?
• Operating system allocates portion of hard disk to function like RAM
page swapped out
RAM (physical memory)
disk (virtual
memory)
page swapped in
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Operating System Functions
What is a device driver?
device driver
• Small program that tells operating system how to communicate with a device
• Each device requires its own specific driver
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Use the Printers and Other Hardware link in Control Panel
Printers and Other Hardware link
Printers and Other Hardware link
Operating System Functions
How do you install a device driver? Control PanelControl Panel
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Operating System Functions
How do operating systems administer security? • Most multiuser operating systems allow each user to log
on
User name
Password text box
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Types of Operating Systems
What are three categories of operating systems?
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commands entered by
user
commands entered by
user
Stand-Alone Operating Systems
What is DOS (Disk Operating System)?• Refers to several single user operating systems
developed in the early 1980s for personal computers
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Stand-Alone Operating Systems
What is Mac OS?• Multitasking operating system available only for computers
manufactured by Apple Apple’s Macintosh
operating system was first commercially successful GUI
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Network Operating Systems
What is UNIX?• Command-line multitasking operating system
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Network Operating Systems
What is Linux?• Popular, free, open-source multitasking
UNIX-type operating system
Open-source software means code is available to the public
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Network Operating Systems
What is Solaris?• UNIX-type operating system
designed specifically fore-commerce applications
• Can manage high-traffic accounts• Incorporates security necessary for
Web transactions• Developed by Sun Microsystems
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Palm OS®
Pocket PC 2002
Embedded Operating Systems
What is an embedded operating system? • Operating
system found on most handheld computers and small devices
• Resides on a ROM chip
Windows CE
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Utility Programs
What is a utility program?• System software that performs a specific task• Examples include:
– File viewer– File compression– Diagnostic utility– Uninstaller– Disk scanner– Disk defragmenter– Backup utility– Screen saver
file 1 after defragmenting
file 1 before defragmenting
results of defragmenting a disk
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Utility Programs
What is a screen saver?
• Causes monitor's screen to display a moving image or blank screen if there is no activity for a specified time period
• Prevents ghosting• Popular for security,
business, or entertainment purposes
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Application Software
Application Software Perform specific tasks for users
» Word Processors» Spread sheets» Databases » Graphic presentation» Compiler» Web browser» Email» Accounting » Project management
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Application Software
• Packaged Software• Custom software• Shareware software• Freeware software• Public domain software• Open source software
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Summary of Operating Systems and Utility Programs
• System software• Operating systems• Operating system functions• Types of operating systems• Stand-alone operating systems• Network operating systems• Embedded operating systems• Utility programs
Complete