'''feh''' is an image viewer but it is mainly used for setting background images on minimalistic desktop setups. To get it to set your background when X starts, put the line <pre> feh --bg-scale /path/to/image </pre> in your .xinitrc.

The following script changes your background to a random image in the folder ~/.bg every 15 minutes. It should be called in your .xinitrc so that its started with X.

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