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.\" 34.Dd June 6, 1993 35.Dt MESG 1 36.Os 37.Sh NAME 38.Nm mesg 39.Nd display (do not display) messages from other users 40.Sh SYNOPSIS 41.Nm mesg 42.Op Cm n | Cm y 43.Sh DESCRIPTION 44The 45.Nm mesg 46utility is invoked by a users to control write access others 47have to the terminal device associated with the standard error 48output. 49Write access is allowed by default, and programs such as 50.Xr talk 1 51and 52.Xr write 1 53may display messages on the terminal. 54.Pp 55Options available: 56.Bl -tag -width flag 57.It Cm n 58Disallows messages. 59.It Cm y 60Permits messages to be displayed. 61.El 62.Pp 63If no arguments are given, 64.Nm mesg 65displays the present message status to the standard error output. 66.Pp 67The 68.Nm mesg 69utility exits with one of the following values: 70.Bl -tag -width flag -compact -offset indent 71.Pp 72.It Li "\ 0" 73Messages are allowed. 74.It Li "\ 1" 75Messages are not allowed. 76.It Li "\>1" 77An error has occurred. 78.El 79.Sh FILES 80.Bl -tag -width /dev/[pt]ty[pq]? -compact 81.It Pa /dev/[pt]ty[pq]? 82.El 83.Sh SEE ALSO 84.Xr biff 1 , 85.Xr talk 1 , 86.Xr write 1 87.Sh HISTORY 88A 89.Nm mesg 90command appeared in 91.At v6 . 92