=head1 NAME

rrdtool info - extract header information from an rrd

=for html <div align="right"><a href="rrdinfo.pdf">PDF</a> version.</div>

=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.

The B<info> function will always report the true version of the B<RRD>;
unlike B<dump> which will generate a current version (0002) xml dump for
older version (0001) files (although the version of the B<RRD> is unchanged).

=head1 EXAMPLE

This is the output generated by running B<info> on a simple rrd which
contains two datasources 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 not maximum values defined for either of its
datasources.

 filename = "randome.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 dump.

=back

=head1 AUTHOR

Tobias Oetiker E<lt>oetiker@ee.ethz.chE<gt>