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The command below uses errd_command:create to generate a #rrd_create
command based on a filename, a data source name and a data source
type. It then turns this into a string that can be used to drive rrdtool.

erl -pa ebin -eval 'io:format("~s~n", [errd_command:format(errd_command:create("foo.rrd", "foos", counter))]).' -s init stop

"create foo.rrd --step 300 DS:foos:COUNTER:900:0:U "
"RRA:AVERAGE:0.5:1:288 RRA:AVERAGE:0.5:12:168 RRA:AVERAGE:0.5:288:365 "
"RRA:MIN:0.5:1:288 RRA:MIN:0.5:12:168 RRA:MIN:0.5:288:365 "
"RRA:MAX:0.5:1:288 RRA:MAX:0.5:12:168 RRA:MAX:0.5:288:365 "