1.\" $NetBSD: mesg.1,v 1.9 2009/03/11 13:54:05 joerg Exp $ 2.\" 3.\" Copyright (c) 1987, 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)mesg.1 8.1 (Berkeley) 6/6/93 31.\" 32.Dd June 6, 1993 33.Dt MESG 1 34.Os 35.Sh NAME 36.Nm mesg 37.Nd display (do not display) messages from other users 38.Sh SYNOPSIS 39.Nm 40.Op Cm n | Cm y 41.Sh DESCRIPTION 42The 43.Nm 44utility is invoked by a user to control write access others 45have to the terminal device associated with the standard error 46output. 47Write access is allowed by default, and programs such as 48.Xr talk 1 49and 50.Xr write 1 51may display messages on the terminal. 52.Pp 53Options available: 54.Bl -tag -width flag 55.It Cm n 56Disallows messages. 57.It Cm y 58Permits messages to be displayed. 59.El 60.Pp 61If no arguments are given, 62.Nm 63displays the present message status to the standard error output. 64.Pp 65The 66.Nm 67utility exits with one of the following values: 68.Pp 69.Bl -tag -width flag -compact -offset indent 70.It Li "\ 0" 71Messages are allowed. 72.It Li "\ 1" 73Messages are not allowed. 74.It Li "\*[Gt]1" 75An error has occurred. 76.El 77.Sh FILES 78.Bl -tag -width /dev/[pt]ty[pq]? -compact 79.It Pa /dev/[pt]ty[pq]? 80.El 81.Sh SEE ALSO 82.Xr biff 1 , 83.Xr talk 1 , 84.Xr write 1 85.Sh HISTORY 86A 87.Nm 88command appeared in 89.At v6 . 90