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+<p><a name="__index__"></a></p>
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<ul>
<li><a href="#see_also">SEE ALSO</a></li>
<li><a href="#author">AUTHOR</a></li>
</ul>
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<p>
<p>If you import the PERFORMANCE variables into your namespace,
you can access RRDtool's internal performance measurements.</p>
<dl>
-<dt><strong><a name="item_use_rrdp">use <strong>RRDp</strong></a></strong>
+<dt><strong><a name="use_rrdp" class="item">use <strong>RRDp</strong></a></strong></dt>
<dd>
<p>Load the RRDp::pipe module.</p>
</dd>
-</li>
-<dt><strong><a name="item_rrdp_3a_3astart_path_to_rrdtool_executable"><strong>RRDp::start</strong> <em>path to RRDtool executable</em></a></strong>
+<dt><strong><a name="rrdp_start_path_to_rrdtool_executable" class="item"><strong>RRDp::start</strong> <em>path to RRDtool executable</em></a></strong></dt>
<dd>
<p>start RRDtool. The argument must be the path to the RRDtool executable</p>
</dd>
-</li>
-<dt><strong><a name="item_rrdp_3a_3acmd_rrdtool_commandline"><strong>RRDp::cmd</strong> <em>rrdtool commandline</em></a></strong>
+<dt><strong><a name="rrdp_cmd_rrdtool_commandline" class="item"><strong>RRDp::cmd</strong> <em>rrdtool commandline</em></a></strong></dt>
<dd>
-<p>pass commands on to RRDtool. check the RRDtool documentation for
+<p>pass commands on to RRDtool. Check the RRDtool documentation for
more info on the RRDtool commands.</p>
+<p><strong>Note</strong>: Due to design limitations, <strong>RRDp::cmd</strong> does not support the
+<code>graph -</code> command - use <code>graphv -</code> instead.</p>
</dd>
-</li>
-<dt><strong><a name="item__answer">$answer = <strong>RRDp::read</strong></a></strong>
+<dt><strong><a name="_answer" class="item">$answer = <strong>RRDp::read</strong></a></strong></dt>
<dd>
<p>read RRDtool's response to your command. Note that the $answer variable will
access the contents of $answer you have to use $$answer which dereferences
the variable.</p>
</dd>
-</li>
-<dt><strong><a name="item__status">$status = <strong>RRDp::end</strong></a></strong>
+<dt><strong><a name="_status" class="item">$status = <strong>RRDp::end</strong></a></strong></dt>
<dd>
<p>terminates RRDtool and returns RRDtool's status ...</p>
</dd>
-</li>
-<dt><strong><a name="item__rrdp__user_"><strong>$RRDp::user</strong>, <strong>$RRDp::sys</strong>, <strong>$RRDp::real</strong></a></strong>
+<dt><strong><a name="_rrdp__user_" class="item"><strong>$RRDp::user</strong>, <strong>$RRDp::sys</strong>, <strong>$RRDp::real</strong></a></strong></dt>
<dd>
<p>these variables will contain totals of the user time, system time and
real time as seen by RRDtool. User time is the time RRDtool is
running, System time is the time spend in system calls and real time
is the total time RRDtool has been running.</p>
-</dd>
-<dd>
<p>The difference between user + system and real is the time spent
-waiting for things like the hard disk and new input from the perl
+waiting for things like the hard disk and new input from the Perl
script.</p>
</dd>
-</li>
-<dt><strong><a name="item__rrdp__error_mode"><strong>$RRDp::error_mode</strong> and <strong>$RRDp::error</strong></a></strong>
+<dt><strong><a name="_rrdp__error_mode" class="item"><strong>$RRDp::error_mode</strong> and <strong>$RRDp::error</strong></a></strong></dt>
<dd>
<p>If you set the variable $RRDp::error_mode to the value 'catch' before you run RRDp::read a potential
ERROR message will not cause the program to abort but will be returned in this variable. If no error
occurs the variable will be empty.</p>
-</dd>
-<dd>
<pre>
$RRDp::error_mode = 'catch';
RRDp::cmd qw(info file.rrd);
print $RRDp::error if $RRDp::error;</pre>
</dd>
-</li>
</dl>
<p>
</p>