To be able to send notifications to the logged in user you must add the file session-local.conf to folder /etc/dbus-1/session.d
Then you can use the command in notify-command.sh to display a message. Don't forget to match the UID with the one currently running the session.
This was tested in Fedora 31/32.
| #!/bin/bash | |
| UID=1000 | |
| export DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/$UID/bus" | |
| export DISPLAY=:0 | |
| notify-send 'Hello world!' 'This is an example notification.' |
| <!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN" | |
| "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd"> | |
| <busconfig> | |
| <policy context="default"> | |
| <!-- Allow everything to be sent --> | |
| <allow send_destination="*" eavesdrop="true"/> | |
| <!-- Allow everything to be received --> | |
| <allow eavesdrop="true"/> | |
| <!-- Allow anyone to own anything --> | |
| <allow own="*"/> | |
| <!-- Allow root on our session busses --> | |
| <allow user="root"/> | |
| </policy> | |
| </busconfig> |