The default console in Ubuntu are white characters and purple background. I want to change it to green characters and black background, just like the old computer screens. I want to set all stuff to be green, including all files listed by "ls".(In the original console, different files may be shown in different colors, I do not want that).

What is more, how to set green characters in pure character environment? (Suppose I do not install X to my OS.)

Thanks a lot for your help.