rup —
remote status display
rup displays a summary of the current system status of a
  particular host or all hosts on the local network. The
  output shows the current time of day, how long the system has been up, and the
  load averages. The load average numbers give the number of jobs in the run
  queue averaged over 1, 5 and 15 minutes.
The following options are available:
  - -d
- For each host, report what its local time is. This is useful for checking
      time synchronization on a network.
- -h
- Sort the display alphabetically by host name.
- -l
- Sort the display by load average.
- -t
- Sort the display by up time.
The
    rpc.rstatd(8) daemon must
    be running on the remote host for this command to work.
    rup uses an RPC protocol defined in
    /usr/include/rpcsvc/rstat.x.
example% rup otherhost
otherhost      up 6 days, 16:45,  load average: 0.20, 0.23, 0.18
example%
 
  - rup: RPC: Program not registered
- The rpc.rstatd(8) daemon
      has not been started on the remote host.
- rup: RPC: Timed out
- A communication error occurred. Either the network is excessively
      congested, or the
      rpc.rstatd(8) daemon has
      terminated on the remote host.
- rup: RPC: Port mapper failure - RPC: Timed out
- The remote host is not running the portmapper (see
      rpcbind(8)), and cannot
      accommodate any RPC-based services. The host may be down.
Therup command appeared in SunOS.