[all variants] Colour-blind: colours in Command Line output

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http://ubuntuforums.org – Hi, I'm asking this question not for myself but for a friend who is colour-blind (completely; he only sees black white and grey) Is there a way to get rid of the colours in Command Line? I mean things like maps are blue (right?) and that sort of stuff. Can it be reset in such a way that there are no colours? Thanks (Hardware)