[rrd-users] Fetching average of last n samples, rrdtool fetch perl

Leif Neland leif at neland.dk
Wed Sep 21 13:57:11 MEST 2005

I'm samping some temperatures every 60 seconds.

I want to fetch the average of the last 5 minutes, and use the number in a 
perl script.

I've tried commands like

rrdtool fetch /usr/local/www/data/temperatur/temp2.rrd  AVERAGE --resolution 
300s -snow-8min -enow-2min

but I still get several lines of data, with timestamps 60 seconds apart.

Are there other options than calculating the average myself in perl?

Any examples of parsing the output of rrdtool fetch in perl?

The project is to be able to dial in and read the temperature in the fridge 
with asterisk....


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