rwall - write to all users over a network
rwall host1 host2 ...
rwall -n netgroup1 netgroup2 ...
rwall -h host -n netgroup
Rwall reads a message from standard input until end-of-file. 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
A machine can only receive such a message if it is running rwalld(1m),
which is normally started up by the daemon inetd(1m).
wall(1), rwalld(1M), netgroup(4)
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 machine.
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