If you are root user, you could send message to all users who logged in with wall command.
root user
# wall "We will have a meeting tomorrow noon."
Broadcast message from root (pts/0) (Wed Feb 6 19:06:05 2008):
We will have a meeting tomorrow noon.
user
$
Broadcast message from root (pts/0) (Wed Feb 6 19:06:05 2008):
We will have a meeting tomorrow noon.
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