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=head1 NAME
rrdlast - Return the date of the last data sample in an RRD
=head1 SYNOPSIS
B<rrdtool> B<last> I<filename>
S<[B<--daemon>|B<-d> I<address>]>
=head1 DESCRIPTION
The B<last> function returns the UNIX timestamp of the most recent
update of the RRD.
=over 8
=item I<filename>
The name of the B<RRD> that contains the data.
=item B<--daemon>|B<-d> I<address>
Address of the L<rrdcached> daemon. If specified, a C<flush> command is sent
to the server before reading the RRD files. This allows B<rrdtool> to return
fresh data even if the daemon is configured to cache values for a long time.
For a list of accepted formats, see the B<-l> option in the L<rrdcached> manual.
rrdtool last --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd
=back
=head1 ENVIRONMENT VARIABLES
The following environment variables may be used to change the behavior of
C<rrdtoolE<nbsp>last>:
=over 4
=item B<RRDCACHED_ADDRESS>
If this environment variable is set it will have the same effect as specifying
the C<--daemon> option on the command line. If both are present, the command
line argument takes precedence.
=back
=head1 AUTHOR
Russ Wright <rwwright@home.com>
Daemon support added by Steve Shipway <steve@steveshipway.org>
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