Try the following:
$ rrdtool graph /dev/null --start $starttime --end $endtime \
DEF:ds1=host1.rrd:ds1:AVERAGE PRINT:ds1:AVERAGE:%lf
0x0
2.613778
By not giving any graphing commands (LINE, AREA, STACK, ...), rrdtool
will not generate any graphic files. Also, the PRINT will output the
AVERAGE value that you want. Simply run the above and pipe it over awk
to extract the value (rrdtool .... | awk 'NR==2{print}'
Rick Blundell wrote:
> Hi Guys,
>
> I'm having trouble figuring out how to fetch data from an RRD from the
> command line. I understand graphing fine, basically what I want to do is
> fetch the average value in an RRD over a specified time period with a
> script.
>
> I can't find any good examples of RRD Fetch with either perl or shell
> scripting. If someone can point me in the right direction that would be
> great.
>
> Thank You,
> Rick Blundell
>
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