rotate wallpapers (use in cron)

rotate_wallpapers.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+# repertoire de fonds d'ecran
+export WALLPAPERS="$HOME/wallpapers/"
+
+# lxde
+if [ -n "$(pgrep "^lxsession$")" ] ; then
+	export DISPLAY=:0
+	pcmanfm -w "`find $WALLPAPERS -name '*.jpg' | shuf -n 1`" || echo "Error settings wallpaper"
+fi
+# gnome 2
+#gconftool -t str -s /desktop/gnome/background/picture_filename "`find $WALLPAPERS -name '*.jpg' | shuf -n 1`"
+if [ -n "$(pgrep "mate-session")" ] ; then
+	# variable DBUS necessaire pour fonctionnement gconftool dans un processus lance hors gnome
+	if [ -z $DBUS_SESSION_BUS_ADDRESS ] ; then
+		. $HOME/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0
+		export DBUS_SESSION_BUS_ADDRESS
+	fi
+	gsettings set org.mate.background picture-filename "`find $WALLPAPERS -name '*.jpg' | shuf -n 1`" || echo "Error settings wallpaper"
+fi
+if [ -n "$(pgrep "gnome-shell")" ] ; then
+	# variable DBUS necessaire pour fonctionnement gconftool dans un processus lance hors gnome
+	if [ -z $DBUS_SESSION_BUS_ADDRESS ] ; then
+		. $HOME/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0
+		export DBUS_SESSION_BUS_ADDRESS
+	fi
+	# gnome 3
+	export GSETTINGS_BACKEND=dconf  
+	gsettings set org.gnome.desktop.background picture-uri "file:`find $WALLPAPERS -name '*.jpg' | shuf -n 1`" || echo "Error settings wallpaper"
+fi
+if [ -n "$(pgrep "awesome")" ] ; then
+	# pour que ça marche il faut les variables d'environnement DISPLAY et XAUTHORITY
+	# on les trouve dans l'env de dbus dont le pid est $DBUS_SESSION_BUS_PID
+	export `strings /proc/$DBUS_SESSION_BUS_PID/environ | grep -w 'XAUTHORITY\|DISPLAY'`
+	awsetbg -r $WALLPAPERS
+fi
+# xfce
+if [ -n "$(pgrep "xfce4-session")" ] ; then
+	if [ -z $DBUS_SESSION_BUS_ADDRESS ] ; then
+		export DISPLAY=:0
+		export $(cat /proc/$(pgrep "xfce4-session")/environ | grep -z "^DBUS_SESSION_BUS_ADDRESS=")
+	fi
+	xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor0/image-path -s "`find $WALLPAPERS -name '*.jpg' | shuf -n 1`"
+fi