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5efaea4cc6
permitted by the University of Berkeley on July 22, 1999. Reviewed by: imp MFC after: 1 week
112 lines
3.5 KiB
Groff
112 lines
3.5 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)comsat.8 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd January 21, 2010
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.Dt COMSAT 8
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.Os
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.Sh NAME
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.Nm comsat
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.Nd biff server
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.Sh SYNOPSIS
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.Nm
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.Sh DESCRIPTION
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The
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.Nm
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utility is the server process which receives reports of incoming mail
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and notifies users if they have requested this service.
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The
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.Nm
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utility receives messages on a datagram port associated with the
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.Dq biff
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service
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specification (see
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.Xr services 5
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and
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.Xr inetd 8 ) .
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The one line messages are of the form:
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.Pp
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.D1 Ar user Ns @ Ns Ar mailbox Ns - Ns Ar offset Ns Op : Ns Ar mailbox-name
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.Pp
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If the
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.Ar user
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specified is logged in to the system and the associated terminal has
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the owner execute bit turned on (by a
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.Dq Nm biff Cm y ) ,
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the
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.Ar offset
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is used as a seek offset into the appropriate mailbox file and
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the first 7 lines or 560 characters of the message are printed
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on the user's terminal.
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Lines which appear to be part of
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the message header other than the
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.Dq Li From ,
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.Dq Li \&To ,
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.Dq Li Date ,
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or
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.Dq Li Subject
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lines are not included in the displayed message.
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.Pp
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If the
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.Ar user
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specified is logged in to the system and the associated terminal has
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the group execute bit turned on (by a
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.Dq Nm biff Cm b ) ,
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two bell characters
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.Tn ( ASCII
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\\007) are printed on the user's terminal.
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.Pp
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If
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.Ar mailbox-name
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omitted, standard mailbox assumed.
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.Sh FILES
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.Bl -tag -width ".Pa /var/mail/user" -compact
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.It Pa /var/run/utx.active
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to find out who is logged on and on what terminals
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.It Pa /var/mail/user
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standard mailbox
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.El
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.Sh SEE ALSO
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.Xr biff 1 ,
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.Xr inetd 8
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Bx 4.2 .
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.Sh BUGS
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The message header filtering is prone to error.
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The density of the information presented is near the theoretical minimum.
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.Pp
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Users should be notified of mail which arrives on other
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machines than the one to which they are currently logged in.
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.Pp
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The notification should appear in a separate window so it
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does not mess up the screen.
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