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Chapter 8 Operating Systems and Utility Programs

Chapter 8 Operating Systems and Utility Programs. Operating system (OS) (sometimes called the platform) coordinates all activities among computer hardware resources. System Software. What is system software?. Programs that maintain operation of computer.

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Chapter 8 Operating Systems and Utility Programs

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  1. Chapter 8 Operating Systems and Utility Programs

  2. Operating system (OS) (sometimes called the platform) coordinates all activities among computer hardware resources System Software • What is system software? Programs that maintain operation of computer Two types are operating systems and utility programs

  3. start the computer provide a user interface manage programs administer security manage memory control a network establish an Internet connection schedule jobs and configure devices monitor performance provide file management and other utilities Operating Systems • What are the functions of an operating system?

  4. Operating System Functions • What is booting? • Process of starting or restarting a computer • Cold boot Turning on computer that has been powered off • Warm boot Restarting computer that is powered on

  5. Operating System Functions • What is a user interface? • Controls how you enter data and instructions and how information displays on screen What is a graphical user interface (GUI)? • User interacts with menus and visual images such as icons and buttons

  6. Operating System Functions • What is single user/ multitasking? • Working on two or more programs that reside in memory at same time • Foreground contains program you are using • Background contains programs that are running but are not in use

  7. Enables two or more users to run programs simultaneously Continues to operate when one of its components fails Can support two or more processors running programs at same time Has duplicate components such as processors, memory, and disk drives Operating System Functions What are other program management features of operating systems? multiprocessing multi-user fault-tolerant computer

  8. Operating System Utility Programs • What is a utility program? • System software that performs maintenance-type tasks • Also called utility

  9. Operating System Utility Programs • What is a file manager? • Performs functions such as copying, renaming, deleting, and moving files • Image viewer displays contents of graphics file when you double click on it

  10. Operating System Utility Programs • What is an uninstaller? Removes a program and all associated files In Windows XP, uninstaller is in Add/Remove Programs in Control Panel

  11. Operating System Utility Programs • What is a disk scanner? • Detects and corrects problems on hard disk • Searches for and removes unnecessary files

  12. Embedded Network Stand-alone Types of Operating Systems • What are three categories of operating systems?

  13. Developed in early 1980s for personal computers D Used command-line interface when first developed, later included menus O Hardly used today because it does not offer GUI S Stand-Alone Operating Systems • What is DOS (Disk Operating System)?

  14. Stand-Alone Operating Systems • What is Windows XP? • Fast, reliable Windows operating system

  15. Stand-Alone Operating Systems • What is Windows Vista? • Successor to Windows XP, containing a new interface and new / enhanced features • Available in several editions, grouped into Home and Business categories

  16. Stand-Alone Operating Systems • What is Mac OS X? • Available only for computers manufactured by Apple • Macintosh operating system has been model for most GUIs

  17. Stand-Alone Operating Systems • What is UNIX? • Used by power users because of its flexibility and power • Most versions offer GUI • Available for computers of all sizes

  18. Stand-Alone Operating Systems • What is Linux? • Popular, free, multitasking UNIX-type operating system • Open-source softwaree—code is available to public • Both a stand-alone and a network operating system Red Hat provides a version of Linux called Red Hat Enterprise Linux.

  19. NetWare Designed for client/server networks UNIX / Linux Multi-purposeoperating system Windows Server 2003 Upgrade to Windows 2000 Server • Solaris • Version of UNIX developed by Sun Microsystems • Specifically for e-commerce applications Network Operating Systems • What are examples of network operating systems?

  20. Embedded Operating Systems • What is an embedded operating system? • Found on most mobile computers, PDAs, and other small devices • Windows CE is scaled-down version of Windows

  21. SIGNS OF VIRUS INFECTION Stand-Alone Utility Programs • What is a virus? • Potentially damaging computer program • Affects computer without user’s knowledge • An unusual message or image is displayed on the computer screen • An unusual sound or music plays randomly • The available memory is less than what should be available • A program or file suddenly is missing • An unknown program or file mysteriously appears • The size of a file changes without explanation • A file becomes corrupted • A program or file does not work properly • System properties change

  22. Stand-Alone Utility Programs • What is an antivirus program? • Identifies and removes viruses in memory, storage media, and incoming files • Must be updated frequently

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