A horizontal string at the top of the graph and/or a vertically
placed string at the left hand side of the graph.
+=head2 Right Axis
+
+[B<--right-axis> I<scale>B<:>I<shift>]
+[B<--right-axis-label> I<label>]
+
+A second axis will be drawn to the right of the graph. It is tied to the
+left axis via the scale and shift parameters. You can also define a label
+for the right axis.
+
+[B<--right-axis-format> I<format-string>]
+
+By default the format of the axis lables gets determined automatically. If
+you want todo this your self, use this option with the same %lf arguments
+you know from the PRING and GPRINT commands.
+
=head2 Size
[B<-w>|B<--width> I<pixels>]
In order to avoid anti-aliasing blurring effects rrdtool snaps
points to device resolution pixels, this results in a crisper
-aperance. If this is not to your liking, you can use this switch
+appearance. If this is not to your liking, you can use this switch
to turn this behaviour off.
Gridfitting is turned off for PDF, EPS, SVG output by default.
suppress the grid and labels altogether. The default for this option is
to automatically select sensible values.
-If you have set --y-grid to 'none' not only the labels get supressed, also
+If you have set --y-grid to 'none' not only the labels get suppressed, also
the space reserved for the labels is removed. You can still add space
manually if you use the --units-length command to explicitly reserve space.
How many digits should rrdtool assume the y-axis labels to be? You
may have to use this option to make enough space once you start
-fideling with the y-axis labeling.
+fiddling with the y-axis labeling.
[B<--units=si>]
=back
+=head2 Legend
+
+[B<-g>|B<--no-legend>]
+
+Suppress generation of the legend; only render the graph.
+
+[B<-F>|B<--force-rules-legend>]
+
+Force the generation of HRULE and VRULE legends even if those HRULE or
+VRULE will not be drawn because out of graph boundaries (mimics
+behaviour of pre 1.0.42 versions).
+
+[B<--legend-position>=(north|south|west|east)]
+
+Place the legend at the given side of the graph. The default is south.
+In west or east position it is necessary to add line breaks manually.
+
+[B<--legend-direction>=(topdown|bottomup)]
+
+Place the legend items in the given vertical order. The default is topdown.
+Using bottomup the legend items appear in the same vertical order as a
+stack of lines or areas.
+
=head2 Miscellaneous
[B<-z>|B<--lazy>]
when using graphv and even when using PRINT.
+[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 the graph to contain
+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 graph [...] --daemon unix:/var/run/rrdcached.sock [...]
+
[B<-f>|B<--imginfo> I<printfstr>]
After the image has been created, the graph function uses printf
Use Times for the title: C<--font TITLE:13:Times>
-If you do not give a font string you can modify just the sice of the default font:
+If you do not give a font string you can modify just the size of the default font:
C<--font TITLE:13:>.
If you specify the size 0 then you can modify just the font without touching
-the size. This is especially usefull for altering the default font without
+the size. This is especially useful for altering the default font without
resetting the default fontsizes: C<--font DEFAULT:0:Courier>.
RRDtool comes with a preset default font. You can set the environment
If images are interlaced they become visible on browsers more quickly.
-[B<-g>|B<--no-legend>]
-
-Suppress generation of the legend; only render the graph.
-
-[B<-F>|B<--force-rules-legend>]
-
-Force the generation of HRULE and VRULE legends even if those HRULE or
-VRULE will not be drawn because out of graph boundaries (mimics
-behaviour of pre 1.0.42 versions).
-
[B<-T>|B<--tabwidth> I<value>]
By default the tab-width is 40 pixels, use this option to change it.
[B<-W>|B<--watermark> I<string>]
-Adds the given string as a watermark, horizontally centred, at the bottom
+Adds the given string as a watermark, horizontally centered, at the bottom
of the graph.
=head2 Data and variables
Calling rrdtool with the graphv option will return information in the
rrdtool info format. On the command line this means that all output will be
-in key=value format. When used from the perl and ruby bindings a hash
+in key=value format. When used from the Perl and Ruby bindings a hash
pointer will be returned from the call.
When the filename '-' is given, the contents of the graph itself will also
graph_top = 22
graph_width = 400
graph_height = 100
+ graph_start = 1232908800
+ graph_end = 1232914200
image_width = 481
image_height = 154
value_min = 0.0000000000e+00
Especially the 'graph_*' keys are new. They help applications that want to
know what is where on the graph.
+=head1 ENVIRONMENT VARIABLES
+
+The following environment variables may be used to change the behavior of
+C<rrdtoolE<nbsp>graph>:
+
+=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 SEE ALSO
L<rrdgraph> gives an overview of how B<rrdtool graph> works.
Program by Tobias Oetiker E<lt>tobi@oetiker.chE<gt>
-This manual page by Alex van den Bogaerdt E<lt>alex@ergens.op.het.netE<gt>
+This manual page by Alex van den Bogaerdt E<lt>alex@vandenbogaerdt.nlE<gt>
+with corrections and/or additions by several people
projects / rrdtool.git / blobdiff