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before the system goes down the
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<code class="filename">/etc/nologin</code> file is created to
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ensure that further logins shall not be
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text and exits.</p></dd><dt><span class="term"><code class="option">-H</code>, </span><span class="term"><code class="option">--halt</code></span></dt><dd><p>Halt the machine.</p></dd><dt><span class="term"><code class="option">-P</code>, </span><span class="term"><code class="option">--poweroff</code></span></dt><dd><p>Power-off the
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machine (the default).</p></dd><dt><span class="term"><code class="option">-r</code>, </span><span class="term"><code class="option">--reboot</code></span></dt><dd><p>Reboot the
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machine.</p></dd><dt><span class="term"><code class="option">-h</code></span></dt><dd><p>Equivalent to