Graphing with rrdtool

RRDtool is widely used today for network based graphing. If you want to learn how to use rrdtool to create graph, here are very good tutorial that I have found -

http://www.cuddletech.com/articles/rrd/rrdintro.pdf

http://merlin.com.ua/doc/rrd/tutorial/

http://www.study-area.org/tips/rrdtool/rrdtool.html

Or you can actually find out all the tutorials that available at the RRDtool website -

http://oss.oetiker.ch/rrdtool/tut/index.en.html

Cheers ;]