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COMSAT(8)		  BSD System Manager's Manual		     COMSAT(8)

NAME
     comsat -- biff server

SYNOPSIS
     comsat

DESCRIPTION
     The comsat	utility	is the server process which receives reports of	incom-
     ing mail and notifies users if they have requested	this service.  The
     comsat utility receives messages on a datagram port associated with the
     "biff" service specification (see services(5) and inetd(8)).  The one
     line messages are of the form:

	   user@mailbox-offset[:mailbox-name]

     If	the user specified is logged in	to the system and the associated ter-
     minal 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 termi-
     nal.  Lines which appear to be part of the	message	header other than the
     "From", "To", "Date", or "Subject"	lines are not included in the dis-
     played message.

     If	the user specified is logged in	to the system and the associated ter-
     minal has the group execute bit turned on (by a "biff b"),	two bell char-
     acters (ASCII \007) are printed on	the user's terminal.

     If	mailbox-name omitted, standard mailbox assumed.

FILES
     /var/run/utmp   to	find out who is	logged on and on what terminals
     /var/mail/user  standard mailbox

SEE ALSO
     biff(1), inetd(8)

HISTORY
     The comsat	utility	appeared in 4.2BSD.

BUGS
     The message header	filtering is prone to error.  The density of the in-
     formation presented is near the theoretical minimum.

     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.

BSD				 July 9, 2002				   BSD

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY | BUGS

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