How do I have different wallpapers for different sessions?

Question

I have two sessions - Unity and Gnome Fallback on my laptop. I'm using Unity in portable mode and gnome fallback with second display at home. And I want different wallpapers for Unity and fallback sessions. Light for Unity and dark for fallback.

I think, I can use autostart option showonlyin=, but don't know how. I don't want switch wallpapers manually every time.

Answer 1

Using this bash script, you can achieve what you want.

#!/bin/bash

if [ "$XDG_CURRENT_DESKTOP" = "Unity" ]
then
  gsettings set org.gnome.desktop.background picture-uri 'file:///usr/share/backgrounds/warty-final-ubuntu.png'
else
  gsettings set org.gnome.desktop.background picture-uri 'file:///usr/share/backgrounds/The_Grass_aint_Greener_by_fix_pena.jpg'
fi

Add this script to Startup Applications (Add → Command sh path/to/script).

And replace the file path to the background image you want.