Tiny, tiny documentation fix -- Peter Valdemar Mørch

[rrdtool.git] / doc / rrdlast.pod

diff --git a/doc/rrdlast.pod b/doc/rrdlast.pod
index d709c5a..a8bf757 100644 (file)
--- a/doc/rrdlast.pod
+++ b/doc/rrdlast.pod
@@ -5,11 +5,12 @@ rrdlast - Return the date of the last data sample in an RRD
 =head1 SYNOPSIS
 
 B<rrdtool> B<last> I<filename>
+S<[B<--daemon> I<address>]>
 
 =head1 DESCRIPTION
 
-The B<last> function returns the UNIX timestamp when the RRD was last
-updated.
+The B<last> function returns the UNIX timestamp of the most recent
+update of the RRD.
 
 =over 8
 
@@ -17,6 +18,30 @@ updated.
 
 The name of the B<RRD> that contains the data.
 
+=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 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