S<[B<--resolution>|B<-r> I<resolution>]>
S<[B<--start>|B<-s> I<start>]>
S<[B<--end>|B<-e> I<end>]>
+S<[B<--daemon> I<address>]>
=head1 DESCRIPTION
TIME SPECIFICATION section for a detailed explanation of how to
specify the end time.
+=item B<--daemon> 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 fetch --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd AVERAGE
+
=back
=head2 RESOLUTION INTERVAL
TIME=$(date +%s)
RRDRES=900
rrdtool fetch subdata.rrd AVERAGE -r $RRDRES \
- -e $(echo $(($TIME/$RRDRES*$RRDRES))) -s e-1h
+ -e $(($TIME/$RRDRES*$RRDRES)) -s e-1h
Or in Perl:
I<19970703 12:45> -- 12:45 July 3th, 1997
(my favorite, and its even got an ISO number (8601)).
+=head1 ENVIRONMENT VARIABLES
+
+The following environment variables may be used to change the behavior of
+C<rrdtoolE<nbsp>fetch>:
+
+=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
-Tobias Oetiker <tobi@oetiker.ch>
+Tobias Oetiker E<lt>tobi@oetiker.chE<gt>
+