Unix is a command line-driven operating system. The Unix command line behaves in a similar manner to the MATLAB interpreter: users repeatedly enter commands at a prompt (denoted by the character >’). You are to write a "command line" that repeatedly prompts the user for a command and repeats it back to them. The user can exit the command line when only the character q is passed (meaning "quit"). For example:

>> command_line
> ls ../folder
You entered: ls ../folder
> echo hello world!
You entered: echo hello world!
> q