Usage: color [off | sparse | normal | complete]

If you have a color-capable terminal and wish to see useful color-coding
of information, use the COLOR command to set the level of coloring you see.

  > color off
  This command disables all color.

  > color sparse
  > color normal
  > color complete

These three commands turn color on to various levels.  Experiment to see
which level suits your personal taste.

'color' with no argument will display your current color level.