initial import of NetBSD tree

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+.\"	$NetBSD: mesg.1,v 1.3 1994/12/23 07:16:31 jtc Exp $
+.\"
+.\" Copyright (c) 1987, 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mesg.1	8.1 (Berkeley) 6/6/93
+.\"
+.Dd June 6, 1993
+.Dt MESG 1
+.Os
+.Sh NAME
+.Nm mesg
+.Nd display (do not display) messages from other users
+.Sh SYNOPSIS
+.Nm mesg
+.Op Cm n | Cm y
+.Sh DESCRIPTION
+The
+.Nm mesg
+utility is invoked by a users to control write access others
+have to the terminal device associated with the standard error
+output.
+Write access is allowed by default, and programs such as
+.Xr talk 1
+and
+.Xr write 1
+may display messages on the terminal.
+.Pp
+Options available:
+.Bl -tag -width flag
+.It Cm n
+Disallows messages.
+.It Cm y
+Permits messages to be displayed.
+.El
+.Pp
+If no arguments are given,
+.Nm mesg
+displays the present message status to the standard error output.
+.Pp
+The
+.Nm mesg
+utility exits with one of the following values:
+.Bl -tag -width flag -compact -offset indent
+.Pp
+.It Li "\ 0"
+Messages are allowed.
+.It Li "\ 1"
+Messages are not allowed.
+.It Li "\>1"
+An error has occurred.
+.El
+.Sh FILES
+.Bl -tag -width /dev/[pt]ty[pq]? -compact
+.It Pa /dev/[pt]ty[pq]?
+.El
+.Sh SEE ALSO
+.Xr biff 1 ,
+.Xr talk 1 ,
+.Xr write 1
+.Sh HISTORY
+A
+.Nm mesg
+command appeared in
+.At v6 .