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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