1.\" Copyright (c) 1989, 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.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)wall.1 8.1 (Berkeley) 6/6/93 29.\" $FreeBSD$ 30.\" 31.Dd February 24, 2012 32.Dt WALL 1 33.Os 34.Sh NAME 35.Nm wall 36.Nd write a message to users 37.Sh SYNOPSIS 38.Nm 39.Op Fl g Ar group 40.Op Ar file 41.Sh DESCRIPTION 42The 43.Nm 44utility displays the contents of 45.Ar file 46or, by default, its standard input, on the terminals of all 47currently logged in users. 48.Pp 49Only the super-user can write on the 50terminals of users who have chosen 51to deny messages or are using a program which 52automatically denies messages. 53.Bl -tag -width indent 54.It Fl g 55Send messages to users in this group. 56This option may be specified 57multiple times, and any user in any of the specified groups will 58receive the message. 59.El 60.Sh SEE ALSO 61.Xr mesg 1 , 62.Xr talk 1 , 63.Xr write 1 , 64.Xr shutdown 8 65.Sh HISTORY 66A 67.Nm 68command appeared in PWB UNIX. 69.Sh BUGS 70The sender's 71.Ev LC_CTYPE 72setting is used to determine which characters are safe to write to a 73terminal, not the receiver's (which 74.Nm 75has no way of knowing). 76