Did you try the "RRD Command" link?
See attachment.

2016-07-05 12:36 GMT-03:00 MTiVi@google <mtimvik@gmail.com>:
> Hello!
> I want to get a values from RRD (like values in legend) in my Observium.
> I don't work with rrdtool before.
>
> How I can get a max bps IN,OUT for last 2 days or for last week via CLI?
>

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--
Eduardo Schoedler

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