2. Command Line Interface
A Command Line Interface allows the user to interact directly with the computer system by typing in commands (instructions) into a screen which looks similar to the one below:
You cannot just type in any kind of instruction of course, because the computer will only react to a definite set of words.
These commands are very specific, for example in DOS you could type in:
copy c:\item.txt d:\
That tells the machine to copy the file 'item.txt' that resides in the root directory of drive C: into the root directory of drive D:\
Many commands have what are called 'switches'. These are extra parameters or flags which add extra functionality to the command. For example:
Before Windows was developed, this type of user interface was what most people used to get the computer to follow instructions.
It is still around though, for example a technician setting up a server in a data centre might use a command line interface or a mainframe administrator setting up a configuration file.
The main disadvantage of a command line interface is that the person must have detailed knowledge of the command that can be used.
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Click on this link: Command Line Interface