User operating system interface.

A User Interface (UI) enables communication by serving as an interface between an application and its user.
For effective communication, each program, including the operating system, comes with a different UI.
The two basic function of an application's user interface is to take the user inputs and deliver the user output.
The types of inputs the UI takes and the types of output the UI provides may vary from application to application.
A user interface of any operating system can be classified into one of the following types:

Types of GUI

The graphical user interface is a type of GUI that allows users via point-and-click operations to interact with the operating system. GUI contains many icons representing variables such as a script, directory, and unit.
The graphical icon provided in the UI can be manipulated by using a suitable pointing device such as a mouse, trackball, touch screen and light pen.
The other input devices like keyboard can also be used to manipulate these graphical icons.
Users can manipulate the graphical icon provided in the UI using an appropriate pointing tool, such as a mouse, trackball, touch screen, and light pen.
Such graphical symbols can also be controlled with other input devices such as the mouse.

The GUI interface is easy to understand and even the new users can operate on them on their own.
The GUI interface visually identifies and confirms any type of activity that users perform.
For example, if the user deletes a file in the Windows operating system, the operating system demands clarification before deleting it.
The GUI interface enables the users to perform a number of tasks at the same time. This features of the operating system are also known as multitasking.

Command line interface is a type of UI that allows users to communicate with the OS by issuing certain specific commands.
You control what's happening in operating systems like DOS and Unix, and in many text-based or character mode programs by typing commands on a command line.
The command line is simply the line where you type the commands on the keyboard.
The only way to control an operating system or a program that uses such a command line interface is to type commands-you don't get menus, dialog boxes or buttons.
Both UNIX and MSDOS use interfaces on command line.
Command line user interfaces are extremely difficult for new users, because they do not usually list all available commands (which need to be memorized) and any misspelling of a command would prevent it from being executed, often resulting in a confusing error message.
To perform a task within this interface, the user must type a command in the command line. After entering the key the user obtained a command from the command line interpreter.
The software program which is responsible for receiving and executing user-issued commands.
The command line interpreter will again display the command prompt along with the output of the previous command provided by the user after the command is processed.
The drawback of the CLI is that to communicate with the operating system, the user needs to remember a great deal.
Such types of interface are therefore not known to be very user friendly.

Wednesday 5 February 2020