104 lines
3.8 KiB
Groff
104 lines
3.8 KiB
Groff
.\" Copyright (c) 1989, 1990 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)wall.1 6.5 (Berkeley) 4/23/91
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.\"
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.TH WALL "1" "August 2013" "util-linux" "User Commands"
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.SH NAME
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wall \- write a message to all users
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.SH SYNOPSIS
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.B wall
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.RB [ \-n ]
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.RB [ \-t
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.IR timeout ]
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.RB [ \-g
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.IR group ]
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.RI [ message " | " file ]
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.SH DESCRIPTION
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.B wall
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displays a
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.IR message ,
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or the contents of a
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.IR file ,
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or otherwise its standard input, on the terminals of all currently logged
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in users. The command will wrap lines that are longer than 79 characters.
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Short lines are whitespace padded to have 79 characters. The command will
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always put a carriage return and new line at the end of each line.
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.PP
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Only the superuser can write on the terminals of users who have chosen to
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deny messages or are using a program which automatically denies messages.
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.PP
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Reading from a
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.I file
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is refused when the invoker is not superuser and the program is
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set-user-ID or set-group-ID.
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.SH OPTIONS
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.TP
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.BR \-n , " \-\-nobanner"
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Suppress the banner.
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.TP
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.BR \-t , " \-\-timeout " \fItimeout\fR
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Abandon the write attempt to the terminals after \fItimeout\fR seconds.
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This \fItimeout\fR must be a positive integer. The default value
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is 300 seconds, which is a legacy from the time when people ran terminals over
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modem lines.
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.TP
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.BR \-g , " \-\-group " \fIgroup\fR
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Limit printing message to members of group defined as a
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.I group
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argument. The argument can be group name or GID.
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.TP
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.BR \-V , " \-\-version"
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Display version information and exit.
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.TP
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.BR \-h , " \-\-help"
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Display help text and exit.
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.SH NOTES
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Some sessions, such as wdm, that have in the beginning of
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.BR utmp (5)
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ut_type data a ':' character will not get the message from
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.BR wall .
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This is done to avoid write errors.
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.SH SEE ALSO
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.BR mesg (1),
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.BR talk (1),
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.BR write (1),
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.BR shutdown (8)
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.SH HISTORY
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A
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.B wall
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command appeared in Version 7 AT&T UNIX.
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.SH AVAILABILITY
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The wall command is part of the util-linux package and is available from
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.UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
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Linux Kernel Archive
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.UE .
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