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Chapter 14 The User View of Operating Systems The Architecture of Computer Hardware and Systems Software: An Information Technology Approach 3rd Edition,

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Presentation on theme: "Chapter 14 The User View of Operating Systems The Architecture of Computer Hardware and Systems Software: An Information Technology Approach 3rd Edition,"— Presentation transcript:

1 Chapter 14 The User View of Operating Systems The Architecture of Computer Hardware and Systems Software: An Information Technology Approach 3rd Edition, Irv Englander John Wiley and Sons  2003 Wilson Wong, Bentley College Linda Senne, Bentley College

2 Chapter 14 User View of Operating Systems 14-2 User Interface  Help the user use the computer system productively  Provide consistent user interface services to application programs to lower learning curves and increase productivity  Choice of user interface depends on the kind of user  Writing programs vs. running applications

3 Chapter 14 User View of Operating Systems 14-3 User Functions  Program execution  File commands  Mount and unmount devices  Printer spooling  Security  Inter-user communication  System Status  Program Services  DCOM, CORBA, Remote Procedure Call (RPC)

4 Chapter 14 User View of Operating Systems 14-4 Interface Design  CLI - Command Line Interface  Batch System Commands  Menu-Driven Interfaces  GUI - Graphical User Interface

5 Chapter 14 User View of Operating Systems 14-5 Command Line Interface  command … …  Operands  keyword (switches) and/or positional  Advantages  More flexible and powerful  Faster for experienced users  Can combine commands

6 Chapter 14 User View of Operating Systems 14-6 Command Line Interfaces

7 Chapter 14 User View of Operating Systems 14-7 Command Languages  Provide a mechanism to combine sequences of commands together. These pseudo-programs are known as scripts or batch files.  Startup files – OS configuration, user preferences  Features of Command Languages  Can accept input from the user and can output messages to I/O devices  Provide ability to create and manipulate variables  Include the ability to branch and loop  Ability to specify arguments to the program command and to transfer those arguments to variables within the program  Provide error detection and recovery

8 Chapter 14 User View of Operating Systems 14-8 DOS Batch File

9 Chapter 14 User View of Operating Systems 14-9 UNIX Shell Script

10 Chapter 14 User View of Operating Systems Menu-Driven Interface  No need to memorize commands  All available commands are listed  Menus can be nested  Low data requirements  Still used in many ATM and Point-of- Sale systems

11 Chapter 14 User View of Operating Systems Menu Driven Interface

12 Chapter 14 User View of Operating Systems Windows Interfaces  Also known as Graphical User Interfaces (GUIs)  Mouse-driven and icon-based  Windows  Are allocated to the use of a particular program or process  Contain a title bar, menu bar, and widgets

13 Chapter 14 User View of Operating Systems GUI Interface – Windows XP

14 Chapter 14 User View of Operating Systems GUI Interface – Linux KDE

15 Chapter 14 User View of Operating Systems GUI Interface - MacIntosh

16 Chapter 14 User View of Operating Systems GUI vs. CLI GUI  Advantages  Easy to learn and use  Little training  Amenable to multi-tasking  Disadvantages  Harder to implement  More HW/SW requirements  Requires lots of memory  SW is complex and difficult to write CLI  Advantages  More flexible and powerful  Faster for experienced users  Can combine commands  Disadvantages  More difficult to learn and use

17 Chapter 14 User View of Operating Systems X-Windows

18 Chapter 14 User View of Operating Systems Duocentric Interface  Focus on the document rather than the application being executed  Expand role of OS by moving capabilities from the application to system services  Example: click on document to run program  Effort to assure that every application program responds in similar ways to user actions.

19 Chapter 14 User View of Operating Systems Copyright 2003 John Wiley & Sons All rights reserved. Reproduction or translation of this work beyond that permitted in Section 117 of the 1976 United States Copyright Act without express permission of the copyright owner is unlawful. Request for further information should be addressed to the permissions Department, John Wiley & Songs, Inc. The purchaser may make back-up copies for his/her own use only and not for distribution or resale. The Publisher assumes no responsibility for errors, omissions, or damages caused by the use of these programs or from the use of the information contained herein.”


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