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

`bcast` is not a standard Linux utility for writing messages to terminals.

`mesg` controls whether other users can send messages to your own terminal - it does not broadcast messages to others.

`print` is used for sending files to a printer, not for broadcasting terminal messages.

The `wall` (write all) command reads a message from standard input or a file and writes it to the terminals of all currently logged-in users. It is a standard POSIX utility available on Linux systems and is commonly used by administrators to notify users of impending shutdowns or maintenance. Running `wall` requires appropriate permissions, and users can block incoming messages using `mesg n`.

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