comsat(8c)comsat(8c)Name
comsat - biff server
Syntax
/etc/comsat
Description
The command is the server process which receives reports of incoming mail and notifies users if they have requested this service. The com-
mand is invoked by when it detects an incoming packet on the datagram port associated with the ``biff'' service specification. For further
information, see The command reads the packet, which is a one line message 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:, To:, Date:, or Subject: lines are not included
in the displayed message.
Restrictions
The message header filtering is prone to error.
Files
Information about who is logged on to which terminals
See Alsobiff(1), inetd(8c)comsat(8c)
Check Out this Related Man Page
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
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