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.\" $OpenBSD: wall.1,v 1.13 2020/02/08 01:09:58 jsg Exp $
.\" $NetBSD: wall.1,v 1.3 1994/11/17 07:17:57 jtc Exp $
.\"
.\" Copyright (c) 1989, 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. 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.
.\"
.\" @(#)wall.1 8.1 (Berkeley) 6/6/93
.\"
.Dd $Mdocdate: February 8 2020 $
.Dt WALL 1
.Os
.Sh NAME
.Nm wall
.Nd write a message to users
.Sh SYNOPSIS
.Nm wall
.Op Fl g Ar group
.Op Ar file
.Sh DESCRIPTION
.Nm
displays the contents of
.Ar file ,
or, by default, its standard input, on the terminals of all
currently logged in users.
.Pp
Only the superuser can write on the
terminals of users who have chosen
to deny messages or are using a program which
automatically denies messages.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl g Ar group
Send messages to users in this group.
This option may be specified
multiple times, and any user in any of the specified groups will
receive the message.
.El
.Pp
Since the sender's
.Xr locale 1
need not match the receivers' locales,
.Nm
deliberately ignores the
.Ev LC_CTYPE
environment variable and allows ASCII printable and space characters
only.
Non-printable characters and UTF-8 characters are replaced with
question marks.
.Sh SEE ALSO
.Xr mesg 1 ,
.Xr talk 1 ,
.Xr write 1 ,
.Xr shutdown 8
.Sh HISTORY
A
.Nm
command appeared in
.At v6 .
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