=include name
-=head1 SYNOPSYS
+=head1 SYNOPSIS
-B<DEF>:I<vname>=I<RRD file>:I<ds name>:I<CF>[:[I<time range>][:I<step size>]]
+B<DEF:>I<E<lt>vnameE<gt>>=I<E<lt>rrdfileE<gt>>:I<E<lt>ds-nameE<gt>>:I<E<lt>CFE<gt>>[:step=I<E<lt>stepE<gt>>][:start=I<E<lt>timeE<gt>>][:end=I<E<lt>timeE<gt>>]
B<VDEF>:I<vname>=I<RPN expression>
These three instructions collect the data out of the B<RRD> files,
optionally altering it (think of a bytes to bits conversion) and
if desired you can define variables containing useful information
-such as maximum, mininimum etcetera. Two of the instructions use
+such as maximum, minimum etcetera. Two of the instructions use
a language called B<RPN> which is described in its own manual page.
=head1 DEF
-B<DEF>:I<vname>=I<RRD file>:I<ds name>:I<CF>[:[I<time range>][:I<step size>]]
+B<DEF:>I<E<lt>vnameE<gt>>=I<E<lt>rrdfileE<gt>>:I<E<lt>ds-nameE<gt>>:I<E<lt>CFE<gt>>[:step=I<E<lt>stepE<gt>>][:start=I<E<lt>timeE<gt>>][:end=I<E<lt>timeE<gt>>]
This command fetches data from an B<RRD> file. The virtual name
I<vname> can then be used throughout the rest of the script. By
default, an B<RRA> which contains the correct consolidated data
at an appropriate resolution will be chosen. The resolution can
-be overriden with the L<--step|rrdgraph/item_Time> option.
-I<Not yet implemented:>[ The resolution can be overriden by specifying
-the B<step size>.] I<Not yet implemented:> [ The time span of this data
-is the same as for the graph by default, you can override this by
-specifying the B<time range>. ]
+be overridden with the L<--step|rrdgraph/item_Time> option.
+The resolution can again be overridden by specifying the B<step size>.
+The time span of this data is the same as for the graph by default,
+you can override this by specifying B<start and end>. Remember to
+escape colons in the time specification!
If the resolution of the data is higher than the resolution of off
graph, the data will be further consolidated. This may result in
image with width 400 and time span 400*1800 seconds (use appropriate
start and end times, such as C<--start end-8days8hours>).
-Example: C<DEF:mydata=router.rrd:ds0:AVERAGE>
+Example:
-Example: C<DEF:januari=router.rrd:ds0:AVERAGE:start=20010101 end=20010201>
+ DEF:ds0=router.rrd:ds0:AVERAGE
+ DEF:ds0weekly=router.rrd:ds0:AVERAGE:step=7200
+ DEF:ds0weekly=router.rrd:ds0:AVERAGE:start=end-1h
+ DEF:ds0weekly=router.rrd:ds0:AVERAGE:start=11\:00:end=start+1h
=head1 VDEF