Is there the ability to do the following:
i want to install linux and other programs and run them only in the command line. I mean as i type in the command line i want to be able to run GUI programs (for example an editor, an X-terminal, or a file manager). I want to be able to write on the command line "nedit xxx" and open the nedit editor on the foreground, while on the background i can see the command line. Or the same with an X-Terminal window; to type for ex. "x-terminal" on the command line and to open an x-terminal window, while on the background i can see the command line.

Why not just use a regular terminal under X? Do a nedit xxx &; the editor will open in the foreground, and you can still use the terminal to type some other command.

"nedit xxx &" ?

The ampersand (&) tells the appropriate command to run in the background while freeing up the command line for future commands, i.e., you'll get back the $ sign or whatever symbol your terminal uses again.