bing-wallpaper-changer.service

[Unit]
Description=It changes your gnome desktop wallpaper automatically from bing.com
After=network-online.target
#Requires=network-online.target
Wants=network-online.target

[Service]
Type=oneshot
ExecStart=/bin/sh -c "$$(command -v bing-wallpaper-changer.py) --once"

[Install]
# https://unix.stackexchange.com/questions/251211/why-doesnt-my-systemd-user-unit-start-at-boot
# systemctl --user list-units --type=target
WantedBy=graphical-session.target