comsat - biff server
Comsat is the server process which listens for reports of incoming mail
and notifies users if they have requested this service. Comsat listens
on a datagram port associated with the ``biff'' service specification
(see services(5)) for one line messages of the form
If the user specified is logged in to the system and the associated
terminal has the owner execute bit turned on (by a ``biff y''), the
offset is used as a seek offset into the appropriate mailbox file and
the first 7 lines or 560 characters of the message are printed on the
user's terminal. Lines which appear to be part of the message header
other than the ``From'', ``To'', ``Date'', or ``Subject'' lines are not
included in the displayed message.
/etc/utmp to find out who's logged on and on what terminals
The message header filtering is prone to error.
Users should be notified of mail which arrives on other machines than
the one they are currently logged in to.
The notification should appear in a separate window so it does not mess
up the screen.
4th Berkeley Distribution 18 July 1983 COMSAT(8C)