How to read rrd file?

rrdtool dump filename.rrd
rrdtool info filename.rrd


rrdtool graph /dev/null -s 3600 DEF:ierr=filename.rrd:ds1:AVERAGE VDEF:ioct_a=ierr,AVERAGE PRINT:ierr:%lf

this command will get the avg value of ds1 (ds1 is the dataset – you can see it in rrdtool info )  , assign it to variable ierr  and print out

#3600 => one hour

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