ruptime man page
ruptime — show host status of local machines
Ruptime gives a status line like uptime for each machine on the local network; these are formed from packets broadcast by each host on the network once a minute.
Machines for which no status report has been received for 11 minutes are shown as being down.
Users idle an hour or more are not counted unless the -a flag is given.
Sort by load average.
Reverses the sort order.
Sort by uptime.
Sort by number of users.
Specify hostname length in output.
The default listing is sorted by host name.
rup(1), rwho(1), uptime(1), rwhod(8)
Ruptime appeared in 4.2BSD.
rup(1), rwho(1), rwhod(8).