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

NAME

     comsat -- biff server

SYNOPSIS

     comsat [-l]

DESCRIPTION

     comsat is the server process which receives reports of incoming mail and notifies users if they have requested this service.  comsat 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

     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'' or ``Subject'' lines are not included in the
     displayed message.

OPTIONS

     The comsat program supports this option:

     -l     The -l option turns on syslogd(8) log messages.

FILES

     To find out who's logged on and on what terminals comsat consults:

     /var/run/utmp
     /var/run/utmpx

SEE ALSO

     biff(1), inetd(8), syslogd(8)

HISTORY

     The comsat command appeared in 4.2BSD.

BUGS

     The message header filtering is prone to error.  The density of the information 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.

     comsat runs as root so that it can open the users maildrop.

BSD
								   May 29, 2010 							       BSD