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15.5.540 setbackground

setbackground [, window] , color

[x11] Sets the background color of window window, or of the default (last) window, to color, which must be a string (e.g., a color name) or a three-element array with floating-point values between 0 and 1 for red, green, and blue.

Alias: setbg

See also: setforeground, Incidental Colors