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System Administration Commands wall(1M)
NAME
wall - write to all users
SYNOPSIS
/usr/sbin/wall [-a] [-g grpname] [filename]
DESCRIPTION
wall reads its standard input until an end-of-file. It then
sends this message to all currently logged-in users preceded
by:
Broadcast Message from ...
If filename is given, then the message is read in from that
file. Normally, pseudo-terminals that do not correspond to
rlogin sessions are ignored. Thus, when using a window sys-
tem, the message appears only on the console window. How-
ever, -a will send the message even to such pseudo-
terminals.
It is used to warn all users, typically prior to shutting
down the system.
The sender must be superuser to override any protections the
users may have invoked See mesg(1).
wall runs setgid() to the group ID tty, in order to have
write permissions on other user's terminals. See setuid(2).
wall will detect non-printable characters before sending
them to the user's terminal. Control characters will appear
as a " ^ " followed by the appropriate ASCII character;
characters with the high-order bit set will appear in "meta"
notation. For example, `\003' is displayed as `^C' and
`\372' as `M-z'.
OPTIONS
The following options are supported:
-a Broadcast message to the console and
pseudo-terminals.
-g grpname Broadcast to the users in a specified group
only, per the group database (see group(4)).
SunOS 5.10 Last change: 13 Jul 1994 1
System Administration Commands wall(1M)
ENVIRONMENT VARIABLES
If the LC_* variables (LC_CTYPE, LC_TIME, LC_COLLATE,
LC_NUMERIC, and LC_MONETARY) are not set in the environment,
the operational behavior of wall for each corresponding
locale category is determined by the value of the LANG
environment variable. See environ(5). If LC_ALL is set, its
contents are used to override both the LANG and the other
LC_* variables. If none of the above variables are set in
the environment, the "C" (U.S. style) locale determines how
wall behaves.
FILES
/dev/tty*
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
mesg(1), write(1), setuid(2), attributes(5), environ(5)
NOTES
wall displays ``Cannot send to ...'' when the open on a
user's tty file fails.
SunOS 5.10 Last change: 13 Jul 1994 2
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This page was generated on Wed Sep 12 11:26:49 GMT 2007
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