rwall - write to all users over a network
/usr/etc/rwall -n netgroup...
/usr/etc/rwall -h hostname -n netgroup
This command is available with the Networking software installation
option. Refer to for information on how to install optional software.
rwall reads a message from standard input until EOF. It then sends
this message, preceded by the line `Broadcast Message ...', to all
users logged in on the specified host machines. With the -n option, it
sends to the specified network groups, which are defined in net-
A machine can only receive such a message if it is running rwalld(8C),
which is normally started up from /etc/inetd.conf by the daemon
wall(1), netgroup(5), inetd(8C), rwalld(8C), shutdown(8)
The timeout is fairly short in order to be able to send to a large
group of machines (some of which may be down) in a reasonable amount of
time. Thus the message may not get through to a heavily loaded
17 December 1987 RWALL(1C)