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User and system programs
- 1. USER AND SYSTEM PROGRAMS PRESENTEDBY: SOHAIL AFRIDI
- 2. USER PROGRAMS • Userprograms perform a particular function directly for the users. • Some of the common application programs include Email, web browsers, gaming software, word processors, graphics software, media player etc. • All of these programs provide an application to the end users, so they are known as application programs. • For example: a web browser is used to find information while a gaming software is used to play games.
- 4. USER PROGRAM TYPES Command-lineInterface (CLI) Batch Interface Graphics User Interface (GUI)
- 5. COMMAND LINE INTERFACE(CLI) • Command line interface is user program in which user uses text commands and a method for entering them (say, a keyboard for typing in commands in a specific format with specific options). • Example: The MS-DOS operating system and the command shell in the Windows operating system are examples of command line interfaces
- 6. BATCH INTERFACE • Batchinterfaces are non-interactive user interfaces, where the user specifies all the details of the batch job in advance to batch processing, and receives the output when all the processing is done. • The computer does not prompt for further input after the processing has started.
- 7. GRAPHICS USER INTERFACE(GUI) • The interface is a window system with a pointing device to direct I/O, choose from menus, and make selections and a keyboard to enter text. • Example: Web Browsers, Word Processors, Spreadsheets, Database Systems and Games.
- 8. SYSTEM PROGRAMS • Systemprograms provide an environment where programs can be developed and executed. • In the simplest sense, system programs also provide a bridge between the user interface and system calls. • Example: Operating System, Networking System, Web Site Server and Data Backup Server.
- 9. CATEGORIES OF SYSTEMPROGRAM • File Management • Status Information • File Modification • Programming-language Support • Program Loading and Execution • Communication • Background Services.
- 10. FILE MANAGEMENT. • Theseprograms create, delete, copy, rename, print, dump, list, and generally manipulate files and directories.
- 11. STATUS INFORMATION • Someprograms simply ask the system for the date, time, amount of available memory or disk space, number of users, or similar status information. • Providing detailed performance, logging, and debugging information. • These programs format and print the output to the terminal or other output devices or files or display it in a window of the GUI.
- 12. FILE MODIFICATION. • Severaltext editors may be available to create and modify the content of files stored on disk or other storage devices.
- 13. PROGRAMMING-LANGUAGE SUPPORT • Compilers,assemblers, debuggers, and interpreters for common programming languages (such as C, C++, Java, and PERL) are often provided with the operating system or available as a separate download.
- 14. PROGRAM LOADING ANDEXECUTION • Once a program is assembled or compiled, it must be loaded into memory to be executed. The system may provide absolute loaders, relocatable loaders, linkage editors, and overlay loaders. • Debugging systems for either higher-level languages or machine language are needed as well.
- 15. COMMUNICATIONS • These programsprovide the mechanism for creating virtual connections among processes, users, and computer systems. • They allow users to send messages to one another’s screens, to browse Web pages, to send e-mail messages, to log in remotely, or to transfer files from one machine to another.
- 16. BACKGROUND SERVICES. • Allgeneral-purpose systems have methods for launching certain system-program processes at boot time. • Other examples include process schedulers that start processes according to a specified schedule, system error monitoring services, and print servers.
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