On occasion administrators working on a given system will "collide" with one another when one administrator's actions impact the other. Part of my solution is to add 'who' to root's .profile so that, when an administrator sudo's to root, they will know if other administrator's are currently on the system. I would like to alert all administrators to the "entrance" of an additional administrator as well. I tried wall, write or
echo "Blah" > /dev/pts1 (whatever). The problem I have (unless I missed an option in the man page) with these approaches is that, when the message appears, it "takes focus" and can leave you wondering what the state of your session is. I've learned that you can continue typing and haven't been disrupted but it's still bothersome. We also have some administrators who wouldn't know what to do if that happened to them. I'm also trying to avoid chat applications because I want people to be able to continue working.
Are there better options or something I've missed which will alleviate this issue? What would be ideal would be a popup in a separate context.