I know that I dont need a GUI for browsing Internet (using Links) but what about doing other things like playing movies, music and pictures slide shows. Is it possible to do that in a text mode command line?
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Of course, the picture quality is lousy. Aa has lots of parameters, but it's only with caca that I could almost make something out.
For real pictures, look for a player or viewer that advertises SVGAlib or FBdev support. This includes several mplayer drivers.
There's not much to gain by not starting X. If you're going to use graphics, you might as well start X.
Sound does not require X anyway.