wall.1

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)wall.1	8.1	9/11/90
.TH wall 1
.SH Name
wall \- write to all users
.SH Syntax
.B wall
.SH Description
.NXR "wall command"
.NXA "wall command" "write command (general)"
.NXR "broadcast message" "sending"
The
.PN wall
command reads its standard input until an EOF.
It then sends this message,
preceded by
`Broadcast Message ...',
to all logged in users.
.PP
The sender should be super-user to override
any protections the users may have invoked.
.SH Diagnostics
`Cannot send to ...' when the open on
a user's tty file fails.
.SH Files
/dev/tty?
.br
/etc/utmp
.SH See Also
mesg(1), write(1)