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.\" @(#)wall.1 6.5 (Berkeley) 4/23/91
.\"
.TH WALL "1" "August 2013" "util-linux" "User Commands"
.SH NAME
wall \- write a message to all users
.SH SYNOPSIS
.B wall
.RB [ \-n ]
.RB [ \-t
.IR timeout ]
.RI [ message " | " file ]
.SH DESCRIPTION
.B wall
displays a
.IR message ,
or the contents of a
.IR file ,
or otherwise its standard input, on the terminals of all currently logged
in users. The command will wrap lines that are longer than 79 characters.
Short lines are whitespace padded to have 79 characters. The command will
always put a carriage return and new line at the end of each line.
.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
Reading from a
.I file
is refused when the invoker is not superuser and the program is suid or sgid.
.SH OPTIONS
.TP
.BR \-n , " \-\-nobanner"
Suppress the banner.
.TP
.BR \-t , " \-\-timeout " \fItimeout\fR
Abandon the write attempt to the terminals after \fItimeout\fR seconds.
This \fItimeout\fR must be a positive integer. The default value
is 300 seconds, which is a legacy from the time when people ran terminals over
modem lines.
.TP
.BR \-V , " \-\-version"
Display version information and exit.
.TP
.BR \-h , " \-\-help"
Display help text and exit.
.SH NOTES
Some sessions, such as wdm, that have in the beginning of
.BR utmp (5)
ut_type data a ':' character will not get the message from
.BR wall .
This is done to avoid write errors.
.SH SEE ALSO
.BR mesg (1),
.BR talk (1),
.BR write (1),
.BR shutdown (8)
.SH HISTORY
A
.B wall
command appeared in Version 7 AT&T UNIX.
.SH AVAILABILITY
The wall command is part of the util-linux package and is available from
.UR ftp://\:ftp.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
Linux Kernel Archive
.UE .