=head1 NAME

rrdinfo - extract header information from an RRD

=head1 SYNOPSIS

B<rrdtool> B<info> I<filename.rrd>

=head1 DESCRIPTION

The B<info> function prints the header information from an RRD in
a parsing friendly format.

Check L<rrdcreate> if you are uncertain about the meaning of the
individual keys.

=head1 EXAMPLE

This is the output generated by running B<info> on a simple RRD which
contains two data sources and one RRA. Note that the number after the
I<last_update> keyword is in seconds since 1970. The string B<NaN>
stands for I<*UNKNOWN*> data. In the example it means that this RRD
has neither minimum nor maximum values defined for either of its
data sources.

 filename = "random.rrd"
 rrd_version = "0001"
 step = 300
 last_update = 955892996
 ds[a].type = "GAUGE"
 ds[a].minimal_heartbeat = 600
 ds[a].min = NaN
 ds[a].max = NaN
 ds[a].last_ds = "UNKN"
 ds[a].value = 2.1824421548e+04
 ds[a].unknown_sec = 0
 ds[b].type = "GAUGE"
 ds[b].minimal_heartbeat = 600
 ds[b].min = NaN
 ds[b].max = NaN
 ds[b].last_ds = "UNKN"
 ds[b].value = 3.9620838224e+03
 ds[b].unknown_sec = 0
 rra[0].cf = "AVERAGE"
 rra[0].pdp_per_row = 1
 rra[0].cdp_prep[0].value = nan
 rra[0].cdp_prep[0].unknown_datapoints = 0
 rra[0].cdp_prep[1].value = nan
 rra[0].cdp_prep[1].unknown_datapoints = 0

=over 8

=item I<filename.rrd>

The name of the B<RRD> you want to examine.

=back

=head1 AUTHOR

Tobias Oetiker E<lt>tobi@oetiker.chE<gt>