rwall - Write to all users over a network
/usr/sbin/rwall -n netgroup...
/usr/sbin/rwall -h hostname -n netgroup
Send the broadcast message to the specified network
groups. Specify the hostname, the name of the host.
The rwall command reads a message from standard input
until end-of-file. It then sends the following message to
all users logged in on the specified host machines, preceded
by the line:
Broadcast Message ...
With the -n option, it sends to the specified network
Note, the timeout is fairly short to allow transmission 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.
A remote host only responds if it is running the rwalld
daemon, which is normally started up from inetd(8).
Commands: inetd(8), rwalld(8)
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