RRDtool 1.11.0 Copyright by Tobi Oetiker Usage: rrdcreate <filename> [--start|-b start time] [--step|-s step] [--no-overwrite] [DS:ds-name:DST:dst arguments] [RRA:CF:cf arguments] ERROR: invalid option -- 'help'
Examples (1) from the manual page, untested
rrdtool create temperature.rrd --step 300 \