1.\" $OpenBSD: wall.1,v 1.13 2020/02/08 01:09:58 jsg Exp $ 2.\" $NetBSD: wall.1,v 1.3 1994/11/17 07:17:57 jtc Exp $ 3.\" 4.\" Copyright (c) 1989, 1990, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)wall.1 8.1 (Berkeley) 6/6/93 32.\" 33.Dd $Mdocdate: February 8 2020 $ 34.Dt WALL 1 35.Os 36.Sh NAME 37.Nm wall 38.Nd write a message to users 39.Sh SYNOPSIS 40.Nm wall 41.Op Fl g Ar group 42.Op Ar file 43.Sh DESCRIPTION 44.Nm 45displays the contents of 46.Ar file , 47or, by default, its standard input, on the terminals of all 48currently logged in users. 49.Pp 50Only the superuser can write on the 51terminals of users who have chosen 52to deny messages or are using a program which 53automatically denies messages. 54.Pp 55The options are as follows: 56.Bl -tag -width Ds 57.It Fl g Ar group 58Send messages to users in this group. 59This option may be specified 60multiple times, and any user in any of the specified groups will 61receive the message. 62.El 63.Pp 64Since the sender's 65.Xr locale 1 66need not match the receivers' locales, 67.Nm 68deliberately ignores the 69.Ev LC_CTYPE 70environment variable and allows ASCII printable and space characters 71only. 72Non-printable characters and UTF-8 characters are replaced with 73question marks. 74.Sh SEE ALSO 75.Xr mesg 1 , 76.Xr talk 1 , 77.Xr write 1 , 78.Xr shutdown 8 79.Sh HISTORY 80A 81.Nm 82command appeared in 83.At v6 . 84