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

[Alex van den Bogaerdt]

On Wed, Sep 21, 2005 at 02:09:24PM +0200, Alex van den Bogaerdt wrote:
> On Wed, Sep 21, 2005 at 01:57:11PM +0200, Leif Neland wrote:
> > 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.
> 
> Try this:
> 
> rrdtool graph /dev/null \
>     --start end-5min \
>     --end now-2min \
>     DEF:t=/usr/local/www/data/temperatur/temp2.rrd:x:type \
>     PRINT:t:%lf
> 
> (adjust "x" and "GAUGE")

oops... and correct the PRINT statement

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