[mrtg] math involving previous run's value

[Richard Johnson]

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I'd like to do something like the following:

Target[qwer]: `/etc/script -c`
Target[uiop]: `/etc/script -p`
Target[asdf]: ({qwer value} - {qwer value from previous mrtg invocation}) /
              ({uiop value} - {uiop value from previous mrtg invocation})

Is there a way to pull the previous run's info from mrtg's data within the
mrtg.cfg file itself, plus do math on the results of other script-driven
targets?

If not, I can write the script to save the previous values or pull them out of
the mrtg logs by itself, and just call it 4 times.  I'd like to avoid doing
that, however, as I'm already slow enough. :-)


Rich

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