ruptime
Show the status of local networked machines (similar to uptime ).
This command is generally no longer used because the supporting daemon generates an inordinate amount of unnecessary network traffic.
-a
Include users even if they've been idle for more than one hour. Normally such users are not counted.
-l
Sort by load average.
-r
Reverse the sort order.
-t
Sort by up time.
-u
Sort by number of users.