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System structure

 

System structure

An operating system contains a kernel, command processor or shell and graphical user interface.

     


KERNAL

·         It is the control module of an operating system.

·         It is that part of the operating system, that loads first and task management, and memory .

·         It is responsible for memory management, process and task management, and disk management.

 

COMMAND PROCESSOR

·         It is that part of an operating system which receives and executes operating system commands.

·         Whenever a command prompt is displayed the command processor waits for a command. After the user  enters a command, the command processor makes sure that command is valid and then either executes it or issues an error message.

·         For an operating system with graphical user interface, the command processor interprets mouse operations and executes the appropriates command. It is also known as command line interpreter.

 

GRAPHICAL USER INTERFACE

·         It is provided so that the user need not remember tedious syntax of the command language, instead pointing to an option by means of a mouse can do his/her job.

 

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