wall(1)wall(1)Namewall - write to all users
SyntaxwallDescription
The command reads its standard input until an EOF. 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.
Diagnostics
`Cannot send to ...' when the open on a user's tty file fails.
Files
/dev/tty?
/etc/utmp
See Alsomesg(1), write(1)wall(1)