xsri is the tool used for setting background image of root window, however this tool is very old and seems to be legacy, and is not available in distributions (not even RHEL6). A fast googling about setting roow background image, following approaches are found; gconf get org.gnome.desktop.background picture-uri 'file:///path/to/image.jpg' gsettings get org.gnome.desktop.background picture-uri 'file:///path/to/image.jpg' gconf for gnome version 2 and gsettings for gnome 3 dconf write "/org/gnome/desktop/background/picture-uri" "'file:///path/to/image.jpg'" The tools mentioned in some perceived popularity order are; feh --bg-fill image.png hsetroot -fill image.png
*** This bug has been marked as a duplicate of bug 3054 ***