Xresources für xdm: /usr/lib/X11R6/lib/X11/xdm/Xresources ( Centos 4.4 )

xterm

.Xresources :

*background:    #ff0000
xterm*background:       #00ff00
xrdb -merge .Xresources
xrdb -query | grep back
ls /usr/share/X11/app-defaults/