Which of the following commands will write a message to the terminals of all logged in users?

`bcast` is not a standard Linux command used for broadcasting messages to all logged-in users.

The `mesg` command is used to control whether other users are permitted to write to your terminal, not to send messages to others.

`print` is a shell built-in or command used to output text to standard output, not to broadcast messages to all users.

The `wall` command, which stands for 'write all', is specifically designed to write a message to every user currently logged in on the system. It broadcasts the standard input or a specified message to all terminal sessions.

`yell` is not a standard Linux command for sending messages to all logged-in users.