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Xrefresh is a simple X program that causes all or part of your screen to be repainted. This is useful when system messages have messed up your screen. Xrefresh maps a window on top of the desired area of the screen and then immediately unmaps it, causing refresh events to be sent to all applications. By default, a window with no background is used, causing all applications to repaint ``smoothly.'' However, the various options can be used to indicate that a solid background (of any color) or the root window background should be used instead.
10 -white Use a white background. The screen just appears to flash quickly, and then repaint.
10 -black Use a black background. This can be somewhat disorienting as everything goes black for a moment.
10 -solid color Use a solid background of the specified color. Try green.
10 -root Use the root window background.
10 -none This is the default. All of the windows simply repaint.
10 -geometry WxH+X+Y Specifies the portion of the screen to be repainted; see X(__miscmansuffix__).
10 -display display This argument allows you to specify the server and screen to refresh; see X(__miscmansuffix__).
10 -version This argument prints the program version and exits.
8 Black, White, Solid, None, Root Determines what sort of window background to use.
8 Geometry Determines the area to refresh. Not very useful.
8 DISPLAY - To get default host and display number.
It should have just one default type for the background.