RUPTIME(1) BSD Reference Manual RUPTIME(1)
ruptime - show host status of local machines
ruptime [-alrtu]
ruptime gives a status line like uptime(1) for each machine on the local network; these are formed from packets broadcast by each host on the net- work once a minute. Machines for which no status report has been received for 11 minutes are shown as being down. The options are as follows: -a Users idle an hour or more are not counted unless the -a flag is given. -l Sort by load average. -r Reverses the sort order. -t Sort by uptime. -u Sort by number of users. The default listing is sorted by host name.
/var/rwho/whod.* data files
rup(1), rwho(1), uptime(1), rwhod(8)
The ruptime command appeared in 4.2BSD. MirBSD #10-current April 23, 1991 1