When i do the 'echo', i have the result : #sh test_script.sh 77134772:461597000 but not in my rrd file: #rrdtool fetch switch.rrd AVERAGE the result is: nan nan -- View this message in context: http://n2.nabble.com/I-need-help-with-my-rrd-file-tp1120359p1125660.html Sent from the RRDtool Users Mailinglist mailing list archive at Nabble.com.