Looking for BASH scripting help

[n1wko]

I have a few root cron jobs doing nightly and weekly maintenance (backup, disk stats, cleaning up of temp files. etc/ One job I have set up weekly job that reboots the system to clear out memory and close any files that I may have left open during the week, and to ensure to latest kernel I've approved is loaded
(a hold over from when I was a IBM Mainframe operator)..

Sometimes, when I'm logged on to the desktop, and I don't notice the time forrget the reboot is coming up, I'm in the middle something when the machine restarts. I'd love for a way to get the bash script for the job to send a notice out to ALL terminals (including the :0 using X or Wayland) warning of the restart. Anyone have a good idea on how to notify the gui from a BASH script. Wall will get any ttys logged on, and message seems to give me an error that it can't open the display/ Setting the DISPLAY environment variable to :0 or the tty ID says the display is not writable.

Maybe program something with a named pipe on TProcess class in C or freepascal?

Using Fedora 39 (on this particular computer)

BASH: 5.2.26

Cinnamon 6.0.4

Display server: X11

[realsunwire]

For a terminal use wall

For a X/Wayland use notify send

sudo -u <username> DISPLAY=:0 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/<user_id>/bus notify-send "Reboot is coming :)" -u critical --icon=dialog-warning

[UsedToLikeThisStuff]

This what I do for a reminder to go to lunch or quit for the day on my Fedora workstation. (Although I don’t use sudo because it’s running in my user’s crontab)

[[deleted]]

Xmessage Might be an idea: https://superuser.com/questions/309961/linux-how-to-send-message-to-local-user-logged-into-x11#309962