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HEAD
BSD 3 development
[unix-history]
/
usr
/
man
/
man1
/
wall.1m
.TH WALL 1M
.SH NAME
wall \- write to all users
.SH SYNOPSIS
.B /etc/wall
.SH DESCRIPTION
.I Wall
reads its standard input until an end-of-file.
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 FILES
/dev/tty?
.br
/etc/utmp
.SH "SEE ALSO"
mesg(1), write(1)
.SH DIAGNOSTICS
`Cannot send to ...' when the open on
a user's tty file fails.