user@mailbox-offset
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.
/var/run/utmp
/var/run/utmpx
Users should be notified of mail which arrives on other machines than the one to which they are currently logged in.
The notification should appear in a separate window so it does not mess up the screen.
comsat runs as root so that it can open the users maildrop.