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.\" 3. 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.\" 30.Dd February 24, 2012 31.Dt WALL 1 32.Os 33.Sh NAME 34.Nm wall 35.Nd write a message to users 36.Sh SYNOPSIS 37.Nm 38.Op Fl g Ar group 39.Op Ar file 40.Sh DESCRIPTION 41The 42.Nm 43utility displays the contents of 44.Ar file 45or, by default, its standard input, on the terminals of all 46currently logged in users. 47.Pp 48Only the super-user can write on the 49terminals of users who have chosen 50to deny messages or are using a program which 51automatically denies messages. 52.Bl -tag -width indent 53.It Fl g 54Send messages to users in this group. 55This option may be specified 56multiple times, and any user in any of the specified groups will 57receive the message. 58.El 59.Sh SEE ALSO 60.Xr mesg 1 , 61.Xr talk 1 , 62.Xr write 1 , 63.Xr shutdown 8 64.Sh HISTORY 65A 66.Nm 67command appeared in PWB UNIX. 68.Sh BUGS 69The sender's 70.Ev LC_CTYPE 71setting is used to determine which characters are safe to write to a 72terminal, not the receiver's (which 73.Nm 74has no way of knowing). 75