DIFFERENT INTERFACES OF OS

COMMAND LINE INTERFACE	MENU-DRIVEN	GRAPHICAL USER INTERFACE
o Requires a user to type commands or press special keys on the keyboard to enter data and instructions that instruct the operating system what to do. o It has to be typed one line at a time. o The command-line user interface is difficult to use because it requires exact spelling, syntax or a set of rules of entering commands and punctuation. o We must observe the complicated rules of syntax that specify exactly what you can type in a given place. o For example, if we want to rename a file name from ABC.txt to DEF.txt we use the following command. o The command-line user interface also requires memorization. It is also easy to make a typing mistake. o The advantage of command-line interface is, it helps the user to operate the computer quickly after memorizing the keywords and syntax.	o Enables the user to avoid memorizing keywords such as copy, paste and syntax. o On-screen, menu-driven interface provide menus as means of entering commands. It shows all the options available at a given point in a form of text-based menu. o Menu-driven user interfaces are easy to learn.	o makes use of the computer’s graphics capabilities to make the operating system and programs easier to use, which is also called ‘user-friendly. o On today’s PC’s and Macintosh. GUIs are used to create the desktop that appears after the operating system finishes loading into memory. o We can easily differentiate the interfaces between Mac OS, Windows XP or Linux by looking at their desktops. o Graphical user interface interact with menus and visual images such as buttons, icons and other graphical objects to issue commands. o On the desktop, we can initiate many actions by clicking icons that represent computer resources such as files, programs and network connections. o Graphical user interface is commonly used and has become a standard.