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Add this to a fiend's .bashrc.
PROMPT_COMMAND will run just before a prompt is drawn.
RANDOM will be between 0 and 32768; in this case, it'll run about 1/10th of the time.
\033 is the escape character. I'll call it \e for short.
\e7 -- save cursor position.
\e[%d;%dH -- move cursor to absolute position
\e[4%dm \e[m -- draw a random color at that point
\e8 -- restore position.
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