This seems like a straightforward question. The "wall" command is designed to write a message to the terminals of all logged in users, so that's the one I'm going to select.
I'm a bit confused on this one. I know there's a command to send messages to all users, but I can't remember the exact name. I'll have to eliminate the options I'm not sure about and make an educated guess.
Okay, let me think this through step-by-step. We're looking for a command that sends a message to all logged in users. I'm pretty sure "wall" is the one that does that, so I'll go with that.
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