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<title>s6-linux-init: the s6-linux-init-hpr program</title>
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<p>
<a href="index.html">s6-linux-init</a><br />
<a href="//skarnet.org/software/">Software</a><br />
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<h1> The <tt>s6-linux-init-hpr</tt> program </h1>
<p>
<tt>s6-linux-init-hpr</tt> triggers the software shutdown procedure,
or, with the <tt>-f</tt> option, it perform an immediate hardware shutdown.
It is normally invoked through <tt>halt</tt>, <tt>poweroff</tt> or
<tt>reboot</tt> wrappers created by
<a href="s6-linux-init-maker.html">s6-linux-init-maker</a>.
</p>
<h2> Interface </h2>
<pre>
s6-linux-init-hpr [ -f ] [ -h | -p | -r ] [ -d | -w ] [ -W ] [ -i ]
</pre>
<ul>
<li> If the <tt>-f</tt> option is present, the system is stopped or rebooted immediately. </li>
<li> Else, the machine's shutdown procedure is started.
<li> The command exits 0; the shutdown procedure happens asynchronously. </li>
</ul>
<p>
This interface is the traditional <em>sysvinit</em> interface for the
<tt>halt</tt>, <tt>poweroff</tt> and <tt>reboot</tt> programs.
<tt>s6-linux-init-hpr</tt> must always be called with one of the
<tt>-h</tt>, <tt>-p</tt> or <tt>-r</tt> options.
</p>
<h2> Options </h2>
<ul>
<li> <tt>-f</tt> : force. The command will not trigger a clean shutdown
procedure; it will just sync the filesystems then tell the kernel to immediately
halt, poweroff or reboot. This should be the last step in the lifetime of the
machine. </li>
<li> <tt>-h</tt> : halt. The system will be shut down, but the power will remain up. </li>
<li> <tt>-p</tt> : poweroff. The system will be shut down and the power turned off. </li>
<li> <tt>-r</tt> : reboot. The system will reboot. </li>
<li> <tt>-d</tt> : Do not write a wtmp shutdown entry. </li>
<li> <tt>-w</tt> : Only write a wtmp shutdown entry; do not actually shut down
the system. </li>
<li> <tt>-W</tt> : Do not send a <tt>wall</tt> message to users before shutting
down the system. Some other implementations of the <tt>halt</tt>, <tt>poweroff</tt>
and <tt>reboot</tt> commands use the <tt>--no-wall</tt> long option to achieve this. </li>
<li> <tt>-i</tt> : interactive confirmation request. The command needs to be
launched in a terminal, and will prompt the user to type the (short) hostname of
the machine to be shut down. On mismatch, the command will abort. The point is to
avoid inadvertently rebooting a remote machine in an ssh session. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> When an administrator runs
<a href="s6-linux-init-maker.html">s6-linux-init-maker</a>, the resulting
directory has a <tt>bin/</tt> subdirectory that contains <tt>halt</tt>,
<tt>poweroff</tt> and <tt>reboot</tt> scripts that call <tt>s6-linux-init-hpr</tt>
with the relevant option. The
contents of this <tt>bin/</tt> subdirectory should then be copied by the
administrator into <tt>/sbin</tt> for full interface compatibility with sysvinit. </li>
</ul>
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