| XTerm 256 coloursOn most terminalsxtermcan display not only the usual 16, but 256 different colours,
    provided the program has been compiled with--enable-256-coloroption. This
    is very convenient for text structuring, colourized shell prompts etc.
    A good description can be found 
    here.
    To find the escape code corresponding to the desired colout quickly, 
    I wrote a little Python program:  
    Colours may be set arbitrarily. The program calculates the 
    xterm colours best matching the selected colours. The text entered in
    the field below is displayed in xterm colours, which
    may differ slightly from the  selected ones. The escape sequences
    for background and foreground are displayed at the right side.
    A click on one of the copy buttons copies the correspondig code into
    the clipboard.
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