09-25-2009
They are obviously at least performing both of these actions but quite several more.
Looks like homework, doesn't it ?
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RWHO(1) BSD General Commands Manual RWHO(1)
NAME
rwho -- who is logged in on local machines
SYNOPSIS
rwho [-a]
DESCRIPTION
The rwho command produces output similar to who, but for all machines on the local network. If no report has been received from a machine
for 11 minutes then rwho assumes the machine is down, and does not report users last known to be logged into that machine.
If a users hasn't typed to the system for a minute or more, then rwho reports this idle time. If a user hasn't typed to the system for an
hour or more, then the user will be omitted from the output of rwho unless the -a flag is given.
FILES
/var/spool/rwho/whod.* information about other machines
SEE ALSO
finger(1), rup(1), ruptime(1), rusers(1), who(1), rwhod(8)
HISTORY
The rwho command appeared in 4.3BSD.
BUGS
This is unwieldy when the number of machines on the local net is large.
Linux NetKit (0.17) August 15, 1999 Linux NetKit (0.17)