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--- blog:change_windows_desktop_background_for_day_and_night_ubuntu_gnu:linux [2010-12-30 08:55] – created brb
+++ blog:change_windows_desktop_background_for_day_and_night_ubuntu_gnu:linux [2010-12-30 09:09] (current) – brb
@@ Line 11: / Line 11: @@
 Notes:
-directly use a jpg file as a windows wallpaper (the settings dialog creates a bmp file behind your back!).
+  * Configuration is by changing the times in the case, and the image file names in the gconf...
-  * Configuration is by changing the set ... variable at the top of the file
+  * Test by calling the script
-  * Test by calling the batchfile
+  * Use f.lux to change the color temperatur of your display to suit the time of day -> http://www.stereopsis.com/flux/
-  * To automate the wallpaper switch:
+  * To automate the wallpaper switch on startup and during the day
-    * make a link in the windows autostart folder
+    * Add the xdbus.sh script to your startup scripts, so that the xdbus variables are available.
-    * add an hourly task to the task manager (or even cleaner, two tasks at the switch times (7:00 and 20:00)
+    * add a cron task (see below)
+<file bash changedesktop.sh>
+#!/bin/bash
+# Change desktop background image depending on the time of day
+# Configuration: Change hourse in the case statements, and the images to load as background
+#
+# load variables for gconftool. These have to be written to Xdbus during login
+. $HOME/.config/Xdbus
+HOUR=$(date +%H)
+gconftool=/usr/bin/gconftool
+case "$HOUR" in
+|07)
+        $gconftool -t string -s /desktop/gnome/background/picture_filename ~/Bilder/DSC_0373.JPG
+        ;;
+|09|10|11|12|13|14|15|16)
+        $gconftool -t string -s /desktop/gnome/background/picture_filename ~/Bilder/DSC_1025.JPG
+        ;;
+|18|19 )
+        $gconftool -t string -s /desktop/gnome/background/picture_filename ~/Bilder/DSC_0959.JPG
+        ;;
+    *)
+        $gconftool -t string -s /desktop/gnome/background/picture_filename ~/Bilder/DSC_0776.JPG
+        ;;
+esac
+</file>
-{{tag>}}
+Note: gconftool needs some environment variables of the user to run. These can be saved during login for later use
+<file bash xdbus.sh>
+#!/bin/sh
+# Export the dbus session address on startup so it can be used by cron
+# use in cron /home/brb/.config/Xdbus;
+xdbus=$HOME/.config/Xdbus
+touch $xdbus
+chmod 600 $xdbus
+env | grep DBUS_SESSION_BUS_ADDRESS > $xdbus
+echo 'export DBUS_SESSION_BUS_ADDRESS' >> $xdbus
+# Export XAUTHORITY value on startup so it can be used by cron
+env | grep XAUTHORITY >> $xdbus
+echo 'export XAUTHORITY' >> $xdbus
+</file>
+Add changedesktop to crontab, using ''crontab -e''
+<file>
+# m h  dom mon dow   command
+@reboot   /home/brb/bin/changedesktop.sh
+* * * * /home/brb/bin/changedesktop.sh
+</file>
+{{tag>ubuntu linux desktop background}}
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