1.\" Copyright (c) 1987, 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)mesg.1 8.1 (Berkeley) 6/6/93 33.\" $FreeBSD: src/usr.bin/mesg/mesg.1,v 1.7.2.1 2001/12/14 15:53:30 ru Exp $ 34.\" $DragonFly: src/usr.bin/mesg/mesg.1,v 1.2 2003/06/17 04:29:29 dillon Exp $ 35.\" 36.Dd June 6, 1993 37.Dt MESG 1 38.Os 39.Sh NAME 40.Nm mesg 41.Nd display (do not display) messages from other users 42.Sh SYNOPSIS 43.Nm 44.Op Cm n | Cm y 45.Sh DESCRIPTION 46The 47.Nm 48utility is invoked by a users to control write access others 49have to the terminal device associated with the standard error 50output. 51Write access is allowed by default, and programs such as 52.Xr talk 1 53and 54.Xr write 1 55may display messages on the terminal. 56.Pp 57Options available: 58.Bl -tag -width flag 59.It Cm n 60Disallows messages. 61.It Cm y 62Permits messages to be displayed. 63.El 64.Pp 65If no arguments are given, 66.Nm 67displays the present message status to the standard error output. 68.Pp 69The 70.Nm 71utility exits with one of the following values: 72.Bl -tag -width flag -compact -offset indent 73.Pp 74.It Li "\ 0" 75Messages are allowed. 76.It Li "\ 1" 77Messages are not allowed. 78.It Li ">1" 79An error has occurred. 80.El 81.Sh FILES 82.Bl -tag -width /dev/[pt]ty[pq]? -compact 83.It Pa /dev/[pt]ty[pq]? 84.El 85.Sh SEE ALSO 86.Xr biff 1 , 87.Xr talk 1 , 88.Xr wall 1 , 89.Xr write 1 90.Sh HISTORY 91A 92.Nm 93command appeared in 94.At v1 . 95