The previous wallpaper changer that I wrote in Python served me well for the last 2 years, but sometimes it would get stuck with some wallpapers: of the 200 pictures I have in my wallpapers folder (mostly taken from the paper wall), some were definitely being shown more often than others. Has the script developed a taste? Probably! 🙂
So this time I decided to put together something very quick, but that does a better job at never showing the same picture twice before all pictures in the folder have been set as desktop background.
It comes as a single bash script, there’s no configuration file to set, it picks pictures from a single folder (whereas the Python version could use several), and it moves files to a folder called shown when setting them as desktop background. Not very elegant, but it gets the job done!
Here it is; you can set your wallpapers folder and the refresh interval at the highlighted lines.
#!/bin/bash
#
# WallpaperChanger.sh
# Copyright 2014 Michele Bonazza michele@michelebonazza.com
#
# A simple script to automatically change your wallpaper in Gnome.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
WALLPAPERS_FOLDER=/home/path/to/your/wallpapers
REFRESH_INTERVAL=$((5 * 60)) # change every 5 minutes
MODE="zoom" # one between none, centered, wallpaper, scaled, stretched, zoom, spanned
# Changes the desktop background, and moves it to the "shown" folder so that it's
# not shown again before all wallpapers in the folder have been used.
# arg1 the file name of the file to be set as new background; must be in the
# current folder
function change_wallpaper() {
mv $1 shown
gsettings set org.gnome.desktop.background picture-uri file://$WALLPAPERS_FOLDER/shown/$1
gsettings set org.gnome.desktop.background picture-options $MODE
}
# Echoes the next wallpaper to be set, picked at random among images in the
# configured folder
function get_next_wallpaper() {
find . -maxdepth 1 -type f -name "*.png" -o -name "*.jpg" -o -name "*.gif" -o -name "*.jpeg"| shuf -n 1
}
mkdir -p $WALLPAPERS_FOLDER/shown
cd $WALLPAPERS_FOLDER
while true; do
NEXT_WP=$(get_next_wallpaper)
# have we used all wallpapers?
if [[ "$NEXT_WP" == "" ]]; then
# yes, chdir to shown, and move them all back to the parent folder
cd shown
# move them to parent folder
find . -maxdepth 1 -type f -name "*.png" -o -name "*.jpg" -o -name "*.gif" -o -name "*.jpeg" | xargs mv -t ..
cd ..
# check again
NEXT_WP=$(get_next_wallpaper)
if [[ "$NEXT_WP" == "" ]]; then
echo "no wallpapers found in $WALLPAPERS_FOLDER, will check again in $REFRESH_INTERVAL seconds..."
sleep $REFRESH_INTERVAL
continue
fi
fi
echo "changing background to $NEXT_WP"
change_wallpaper $NEXT_WP
sleep $REFRESH_INTERVAL
done
As always, I’ve also added this to my pastebin.
Save it as wallpaper_changer.sh, make it executable
chmod +x wallpaper_changer.sh
and add it to your “Startup applications” list, which can be found in Ubuntu’s main menu (the one you use to log out/shut down the computer), or can be brought up from a terminal using
gnome-session-properties
Click “Add”, use whatever name you want and browse to the wallpaper_changer.sh script (wherever you’ve saved it).
Sometimes I found that “Startup applications” doesn’t work: make sure that after having added your script and closed the window you can see an entry called wallpaper_changer.sh.desktop in the output of
ls -l ~/.config/autostart
If it’s not there, remove the entry and try again (I know, I know. The alternative is to fiddle with Upstart or init.d so if you want a GUI, that’s better than nothing!)
You can also change the effect to apply to your wallpapers at line 23 in the script.
Enjoy your new desktops! 🙂
something I did not know 