=head1 NAME
-rrdtool update - Store a new set of values into the rrd
+rrdtool update - Store a new set of values into the RRD
=for html <div align="right"><a href="rrdupdate.pdf">PDF</a> version.</div>
=head1 SYNOPSIS
-B<rrdtool> B<update> I<filename>
+B<rrdtool> {B<update> | B<updatev>} I<filename>
S<[B<--template>|B<-t> I<ds-name>[B<:>I<ds-name>]...]>
S<B<N>|I<timestamp>B<:>I<value>[B<:>I<value>...]>
S<I<at-timestamp>B<@>I<value>[B<:>I<value>...]>
=over 8
+=item B<updatev>
+
+This alternate version of B<update> takes the same arguments and
+performs the same function. The I<v> stands for I<verbose>, which
+describes the output returned. B<updatev> returns a list of any and all
+consolidated data points (CDPs) written to disk as a result of the
+invocation of update. The values are indexed by timestamp (time_t),
+RRA (consolidation function and PDPs per CDP), and data source (name).
+Note that depending on the arguments of the current and previous call to
+update, the list may have no entries or a large number of entries.
+
=item I<filename>
The name of the B<RRD> you want to update.
The template switch allows you to specify which data sources you are
going to update and in which order. If the data sources specified in
-the template are not available in the rrd file, the update process
+the template are not available in the RRD file, the update process
will abort with an error message.
While it appears possible with the template switch to update data sources
from the template the I<*UNKNOWN*> value.
Do not specify a value for a COMPUTE B<DST> in the B<update> function. If
-this is done accidently (and this can only be done using the template switch),
+this is done accidentally (and this can only be done using the template switch),
B<RRDtool> will ignore the value specified for the COMPUTE B<DST>.
=item B<N>|I<timestamp>B<:>I<value>[B<:>I<value>...]
B<DERIVE> or B<ABSOLUTE>.
The remaining elements of the argument are DS updates. The order of this list is
-the same as the order the data sources were defined in the rra.
+the same as the order the data sources were defined in the RRA.
If there is no data for a certain data-source, the letter
B<U> (eg. N:0.1:U:1) can be defined.