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COMSAT(8C)                                                          COMSAT(8C)



NAME
       comsat, in.comsat - biff server

SYNOPSIS
       /usr/etc/in.comsat

DESCRIPTION
       comsat is the server process which listens for reports of incoming mail
       and notifies users who have requested to be told when mail arrives.  It
       is  invoked as needed by inetd(8C), and times out if inactive for a few
       minutes.

       comsat listens on a datagram port associated with the  biff(1)  service
       specification (see services(5)) for one line messages of the form

              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  off-
       set  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  printed  when
       displaying the message.

FILES
       /etc/utmp           to find out who's logged on and on what terminals

SEE ALSO
       biff(1), services(5), inetd(8C)

BUGS
       The message header filtering is prone to error.

       The notification should appear in a separate window so it does not mess
       up the screen.



                               9 September 1987                     COMSAT(8C)