Question

Is there operating system without user interface?

Answer 1

Answer:

yes

Explanation:

A User Interface is the software that a person uses to interact with the OS and the applications running on a computer. OS and applications run without the need to interface otherwise. A person interacts via the User Interface just to provide input, and look at the output of software that is running.

Answer 2

Answer:

MD-DOS is the correct answer.

Explanation:

MS-DOS stands for Microsoft Disk Operating system, it was developed by Microsoft. It was  a re branded version of IBM PC DOS and  was the main operating system for IBM PCs during 1980 and early 1990's. Later it was replaced by various operating systems that offered graphical user interface. DOS used command liner interface. MS-DOS was succeeded by  Windows NT.  

Some Linux operating systems are also without any user interface e.g Tiny Core Linux is the correct answer.