The command that will write a message to the terminals of all logged-in users is:
D. `wall`
You can use the `wall` command to broadcast a message to all users who are currently logged in. For example, if you want to send a message to all users, you can use `wall` followed by the message text:
```
wall "This is a broadcast message to all users."
```
This message will be displayed on the terminals of all logged-in users.
wall is a command-line utility that displays a message on the terminals of all logged-in users. The messages can be either typed on the terminal or the contents of a file. wall stands for write all, to send a message only to a specific user use the write command.
wall is a command-line utility that displays a message on the terminals of all logged-in users. The messages can be either typed on the terminal or the contents of a file. wall stands for write all, to send a message only to a specific user use the write command.
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