rrdb : improving doc and code

rrdb/getvalues.sh

@@ -2,18 +2,24 @@
 
 source ./commun.sh
 
+tmpf="somevalues.dat"
+
 rrdtool fetch $RRDB LAST			|
 tr -d ':'					|
 awk	'
 	(!/nan/ && NF==2) { print $1, $2 }
 	' 					\
-			> toto
+			> ${tmpf}
 
+#
+# as an example, we are gnuploting our datas
+#
 gnuplot << __EOC__
 set term png size 800,600
 set output "graphe.png"
-plot "toto" with lines
+set grid
+plot "${tmpf}" with lines
 __EOC__
 
-rm toto
+rm ${tmpf}