Using plasma-apply-wallpaperimage in cron job

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For reference, the systemd solution would look something like this. The systemd timer essentially replaces the cron job:
~/.config/systemd/user/update-desktop.timer:

[Unit]
Description=Periodically update the desktop background

[Timer]
# Trigger when hour and minute are 0 (i.e. midnight)
OnCalendar=0 0 * * *

[Install]
WantedBy=timers.target

~/.config/systemd/user/update-desktop.service:

[Unit]
Description=Update the desktop background with the latest image from somewhere

[Service]
Type=oneshot
# Your script that fetches the image and sets it
ExecStart=/path/to/update-desktop.sh

Once you’ve created these two files, you just need to run
systemctl --user enable update-desktop.timer
to enable it.

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