#!/bin/bash
dbus-send --session --dest=org.kde.plasmashell --type=method_call /PlasmaShell org.kde.PlasmaShell.evaluateScript 'string:
var Desktops = desktops();                                                                                                                       
for (i=0;i<Desktops.length;i++) {
        d = Desktops[i];
        d.wallpaperPlugin = "org.kde.image";
        d.currentConfigGroup = Array("Wallpaper",
                                    "org.kde.image",
                                    "General");
        d.writeConfig("Image", "file:///wallpaper/image/location.jpg");
}'