Biff is a Unix utility that notifies users of incoming mail in their mailbox. It was originally developed for the BSD (Berkeley Software Distribution) Unix operating system. When Biff is enabled, it can provide an alert (usually a visual or auditory signal) when new mail arrives, allowing users to be aware of their mail status without needing to check their mailboxes manually. The command can be turned on or off using the command: - `biff y` to enable notifications.
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