RRDTOOL Update with script in string

Hello,

I have a simple script that greps some values from a csv file.
I wanted to do the following:

rrdtool update /home/pi/net/net.rrd N:'cut -d, /home/pi/net/devices.csv -f13
| cut -d: -f2'::::: to get the first value out of the csv file, but it seems
that it won't work.

Can this be done or do I need another workaround to extract the values and
to update the RRD DB?

Thanks a lot for your help.
Mark



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