NAME

wall - write to all users

SYNOPSIS

wall [file]

DESCRIPTION

Wall reads its standard input until an end-of-file. It then sends this message, preceded by `Broadcast Message ...', to all logged in users.

The sender should be super-user to override any protections the users may have invoked.

FILES

/dev/tty?
/var/adm/utmp

SEE ALSO

mesg(1), write(1), utmp(5)

DIAGNOSTICS

`Cannot send to ...' when the open on a user's tty file fails.