Which operating system is a command line operating system?

Most current Unix-based systems offer both a command line interface and a graphical user interface. The MS-DOS operating system and the command shell in the Windows operating system are examples of command line interfaces.

Does Linux use command-line interpreter?

The shell is the Linux command line interpreter. It provides an interface between the user and the kernel and executes programs called commands. For example, if a user enters ls then the shell executes the ls command.