(find repository) How to make your own indicator in linux?

Question

linux

Hello.
I want to make my own indicator in linux?
Under the indicator I mean a light bulb in the tray, or in the overlay, or in the terminal.
The program must execute the code a certain number of times at a certain time and, based on it, issue information / light up green / red - I can't find that article/github repository. Maybe someone understands what it is about, tell me, please

Answer 1

notify-send "`date`" "Hey! Do you really need lamp indicators?!"

Answer 2

background-attachment: fixed;
Considering that you have a picture attached to the block in the background
But in Safari it is horror, death and pain