I can't find an answer for this and it may be because I don't know how to phrase the question.
wall to broadcast a message to open terminals once a day. When it does, the terminal users' prompts will disappear until they press ENTER. The wall command is
wall -n wall message
And for lack of a better explanation, here is what it looks like on the users' terminal:
As you can see it just hangs. Pressing ENTER or doing anything will get me back to a prompt. In fact, even though it doesn't look like a prompt, it is, because instead of pressing ENTER I can do a command, or press up arrow to see previous commands, etc.
It's not critical, it just bugs me. I have considered that maybe it's by design, to force users to acknowledge that they've seen the message, although the fact that it only looks like it's not a prompt seems like it defeats that purpose.