wall
Write a message on the terminals of users currently logged in. More information: https://manned.org/wall.
- Send a message:
wall {{message}}
- Send a message to users that belong to a specific group:
wall --group {{group_name}} {{message}}
- Send a message from a file:
wall {{file}}
- Send a message with timeout (default 300):
wall --timeout {{seconds}} {{file}}