| .\" Copyright (c) 1989, 1990 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. All advertising materials mentioning features or use of this software |
| .\" must display the following acknowledgement: |
| .\" This product includes software developed by the University of |
| .\" California, Berkeley and its contributors. |
| .\" 4. 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 |
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| .\" @(#)wall.1 6.5 (Berkeley) 4/23/91 |
| .\" |
| .\" Modified for Linux, Mon Mar 8 18:07:38 1993, faith@cs.unc.edu |
| .\" |
| .Dd March 8, 1993 |
| .Dt WALL 1 |
| .Os "Linux 0.99" |
| .Sh NAME |
| .Nm wall |
| .Nd write a message to users |
| .Sh SYNOPSIS |
| .Nm wall |
| .Op Ar file |
| .Sh DESCRIPTION |
| .Nm Wall |
| displays the contents of |
| .Ar file |
| or, by default, its standard input, on the terminals of all |
| currently logged in users. |
| .Pp |
| Only the super-user can write on the |
| terminals of users who have chosen |
| to deny messages or are using a program which |
| automatically denies messages. |
| .Pp |
| Reading from a file is refused when the invoker is not superuser |
| and the program is suid or sgid. |
| .Sh SEE ALSO |
| .Xr mesg 1 , |
| .Xr talk 1 , |
| .Xr write 1 , |
| .Xr shutdown 8 |
| .Sh HISTORY |
| A |
| .Nm |
| command appeared in |
| .At v7 . |
| .Sh AVAILABILITY |
| The wall command is part of the util-linux-ng package and is available from |
| ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. |
