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<li><a href="#author">AUTHOR</a></li>
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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>
+<dt><strong><a name="use_rrdp" class="item">use <strong>RRDp</strong></a></strong></dt>
<dd>
<p>Load the RRDp::pipe module.</p>
</dd>
-<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>
+<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>
-<dt><strong><a name="item_rrdp_3a_3acmd_rrdtool_commandline"><strong>RRDp::cmd</strong> <em>rrdtool commandline</em></a></strong></dt>
+<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
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>
-<dt><strong><a name="item__answer">$answer = <strong>RRDp::read</strong></a></strong></dt>
+<dt><strong><a name="_answer" class="item">$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>
-<dt><strong><a name="item__status">$status = <strong>RRDp::end</strong></a></strong></dt>
+<dt><strong><a name="_status" class="item">$status = <strong>RRDp::end</strong></a></strong></dt>
<dd>
<p>terminates RRDtool and returns RRDtool's status ...</p>
</dd>
-<dt><strong><a name="item__rrdp__user_"><strong>$RRDp::user</strong>, <strong>$RRDp::sys</strong>, <strong>$RRDp::real</strong></a></strong></dt>
+<dt><strong><a name="_rrdp__user_" class="item"><strong>$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
waiting for things like the hard disk and new input from the perl
script.</p>
</dd>
-<dt><strong><a name="item__rrdp__error_mode"><strong>$RRDp::error_mode</strong> and <strong>$RRDp::error</strong></a></strong></dt>
+<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