-h -? Print help
-v -V Print version
-z Dump zero counters too. By default they are not shown.
-r Reset history.
-n Do not display anything, only update history.
-a Dump absolute values of counters. The default is to calculate increments since the previous use.
-s Do not update history, so that the next time you will see counters including values accumulated to the moment of this measurement too.
-d <INTERVAL> Run in daemon mode collecting statistics. <INTERVAL> is interval between measurements in seconds.
-t <INTERVAL> Time interval to average rates. Default value is 60 seconds.