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Chapter 8 Operating Systems and Utility Programs By: James Granahan.

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1 Chapter 8 Operating Systems and Utility Programs By: James Granahan

2 Objectives Identify the types of system software Summarize the startup process Describe the function of an operating system Discuss ways that some operating systems help Explain the purpose of the utilities included with most operating systems Summarize the features of several stand-alone operating systems Identify devices that use operating systems Explain the purpose of several stand-alone utility programs

3 System Software System softwareSystem software consists of the programs that control or maintain the operations of the computer and its devices. System software serves as the interface between the user, the application software, and the computer’s hardware.

4 Operating Systems operating system (OS)An operating system (OS) is a set of programs containing instructions that coordinate all the activities among computer hardware resources. In most cases, the operating system is installed and resides on the computer’s hard disk.

5 Some Functions of an Operating System Starting a Computer –Booting is the process of starting or restarting a computer. Cold Boot Warm Boot

6 Recovery Disk A boot drive is the drive from which your personal computer boots (starts). –In most cases, the C drive is the boot drive. A recovery disk, also called a boot disk, is a floppy, Zip disk, CD, or DVD that contains a few system files that will start that computer.

7 Providing a User Interface Command-Line Interface –A user types commands or presses special keys on the keyboard to enter data and instructions. Menu-Driven Interface –Provides menus as a means of entering commands. Graphical User Interface (GUI)

8 Managing Programs Single user/single tasking operating system Single user/ multitasking operating system –Foreground –Background

9 Managing Memory The purpose of a memory manager is to optimize the use of random access memory. Virtual memory is a portion of a storage medium that the operating system allocates to function as additional RAM.

10 Scheduling Jobs Job Buffer Spooling Queue

11 Configuring Devices A driver, short for device driver, is a small program that tells the operating system how to communicate with a specific device. Plug and Play is when the operating system automatically configures new devices as you install them.

12 Monitoring Performance A performance monitor is a program that assesses and reports information about various computer resources and devices. A network operating system, or network OS, is an operating system that organizes and coordinates how multiple users access and share resources on a network.

13 Security Log on –Accessing a computer or a network User name or User ID –A unique combination of characters that identifies one specific user. Password –A private combination of characters associated with the user name that allows access to certain computer resources.

14 Operating Systems File Manager –A utility that performs functions related to file management. Image Viewer –A utility that allows users to display and copy the contents of a graphics file.

15 Types of Operating Systems Stand-alone –Examples- DOS, UNIX, and Linux Network –Examples- NetWare, Windows Server 2003, and Solaris Embedded –Examples- Windows CE.NET, and Palm OS

16 Examples of Stand-Alone Operating Systems DOS –Refers to several single user operating systems developed in the early 1980s for personal computers. Windows XP –It is Microsoft's fastest, most reliable Windows operating system. –It also has three editions- Windows XP Home Edition, Windows XP Professional, and Windows XP Tablet PC Edition.

17 Stand-Alone Operating Systems A stand-alone operating system is a complete operating system that works on a desktop computer, notebook computer, or mobile computing device. Some stand-alone operating systems are called client operating systems.

18 Examples continued Mac OS X –It is a multitasking operating system available only for computers manufactured by Apple. OS/2 Warp Client Unix Linux –It is a popular multitasking UNIX—type operating system.

19 Network Operating Systems Netware Windows Server 2003 –It is an upgrade of Windows 2000 Server. OS/2 Warp Server for e-business UNIX Linux Solaris –It is a version of UNIX developed by Sun Microsystems.

20 Embedded Operating Systems Windows CE.NET Pocket PC 2002 Palm OS Symbian OS

21 Stand-Alone Utility Programs Antivirus Programs –Protects a computer against viruses by identifying and removing any computer viruses found in memory, on storage media, or on incoming files. Personal Firewalls –A personal firewall is a utility program that detects and protects a personal computer from unauthorized intrusions.

22 Summary This chapter defined an operating system and then discussed the functions common to most operating systems. It also introduced several utility programs that are commonly found in operating systems. Finally, it talked about stand-alone utility programs and their applications.

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