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rrdtool

rrdtool

Graph manually

for i in `ls`; do
    rrdtool graph $i.png -w 1024 -h 768 -a PNG --slope-mode --font DEFAULT:7: \
      --start -3days --end now DEF:in=$i:netin:MAX DEF:out=$i:netout:MAX \
      LINE1:in#0000FF:"in" LINE1:out#00FF00:"out"
done

References