The following options are available:

-d

For each host, report what its local time is. This is useful for checking time syncronization on a network.

-s

Print time data in seconds (seconds of uptime or seconds since the epoch), for scripts.

-h

Sort the display alphabetically by host name.

-l

Sort the display by load average.

-t

Sort the display by up time.

The rpc.rstatd8 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.rstatd8 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.rstatd8 daemon has terminated on the remote host.

rup: RPC: Port mapper failure - RPC: Timed out

The remote host is not running the portmapper (see portmap(8)), and cannot accomodate any RPC-based services. The host may be down.