I think the DOS/Win thing was just an analogy.
You mean CLI vs. GUI, right?
In inttab you'll see a line about the default runlevel that will probably say '5' and you want to change that to something like '3' - run the multi-user networked CLI startup rather than the GUI. Then, if you want X from CLI, it's just 'startx' on most every distro.
Otherwise, depending on your X session manager's login (or lack thereof) you might be able to add CLI to a graphical login option, if you've got one - that'd be xdmrc maybe or something like. And of course, you boot into GUI as is, but can ctrl-alt-f1 to get the CLI.
Otherwise, I don't know how you'd manage it - at least *some* file is going to need editing.
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