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-<html>
- <head>
- <meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
- <meta http-equiv="Content-Language" content="en" />
- <title>s6-linux-init: the s6-linux-init-poweroff program</title>
- <meta name="Description" content="s6-linux-init: the s6-linux-init-poweroff program" />
- <meta name="Keywords" content="s6 linux init administration root utilities shutdown halt poweroff reboot" />
- <!-- <link rel="stylesheet" type="text/css" href="//skarnet.org/default.css" /> -->
- </head>
-<body>
-
-<p>
-<a href="index.html">s6-linux-init</a><br />
-<a href="//skarnet.org/software/">Software</a><br />
-<a href="//skarnet.org/">skarnet.org</a>
-</p>
-
-<h1> The <tt>s6-linux-init-poweroff</tt> program </h1>
-
-<p>
-<tt>s6-linux-init-poweroff</tt> triggers the shutdown procedure in order to
-halt the system; or, with the <tt>-f</tt> option, it performs an immediate
-hard shutdown.
-</p>
-
-<h2> Interface </h2>
-
-<pre>
- s6-linux-init-poweroff [ -h | -p | -r ] [ -d | -w ] [ -W ] [ -f ] [ -R <em>tmpfsdir</em> ]
-</pre>
-
-<ul>
- <li> If the <tt>-f</tt> option is present, s6-linux-init-poweroff halts the system immediately. </li>
- <li> Else, it triggers the machine's shutdown procedure.
- <li> It exits 0. The shutdown procedure happens asynchronously. </li>
-</ul>
-
-<p>
- This interface follows the traditional <em>sysvinit</em> interface for the
-<tt>halt</tt>, <tt>poweroff</tt> and <tt>reboot</tt> programs as close as possible.
-</p>
-
-<h2> Exit codes </h2>
-
-<ul>
- <li> 0: shutdown procedure triggered. </li>
- <li> 100: wrong usage, or user does not have root privileges. </li>
- <li> 111: system call failed. </li>
-</ul>
-
-<h2> Options </h2>
-
-<ul>
- <li> <tt>-h</tt>&nbsp;: halt. No matter the name of the command, it will order
-a halt (i.e. the system will be shut down, but the power will remain up).
-This is the default for <tt>s6-linux-init-halt</tt>. </li>
- <li> <tt>-p</tt>&nbsp;: poweroff. No matter the name of the command, it will order
-a power off. This is the default for <tt>s6-linux-init-poweroff</tt>. </li>
- <li> <tt>-r</tt>&nbsp;: reboot. No matter the name of the command, it will order
-a reboot. This is the default for <tt>s6-linux-init-reboot</tt>. </li>
- <li> <tt>-d</tt>&nbsp;: Do not write a wtmp shutdown entry. </li>
- <li> <tt>-w</tt>&nbsp;: Only write a wtmp shutdown entry; do not actually shut down
-the system. </li>
- <li> <tt>-W</tt>&nbsp;: 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>-f</tt>&nbsp;: 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>-R&nbsp;<em>tmpfsdir</em></tt>&nbsp;: assume that the root-only
-boot-time tmpfs has been mounted on <em>tmpfsdir</em>. Default is <tt>/run</tt>.
-It is important to get this right, because the contact point with the
-<a href="s6-linux-init-shutdownd.html">s6-linux-init-shutdownd</a> daemon,
-which manages the shutdown procedure, is located under this directory. The
-<tt>halt</tt>, <tt>poweroff</tt> and <tt>reboot</tt> scripts created by a
-<a href="s6-linux-init-maker.html">s6-linux-init-maker</a> invocation
-automatically use the correct <tt>-R</tt> option. </li>
-</ul>
-
-<h2> Notes </h2>
-
-<ul>
- <li> The
-<a href="s6-linux-init-halt.html">s6-linux-init-halt</a>,
-<a href="s6-linux-init-poweroff.html">s6-linux-init-poweroff</a>,
-<a href="s6-linux-init-reboot.html">s6-linux-init-reboot</a> and
-<a href="s6-linux-init-shutdown.html">s6-linux-init-shutdown</a>
-binaries are not meant to be called directly by administrators.
-Instead, their purpose is to be used in <tt>halt</tt>, <tt>poweroff</tt>,
-<tt>reboot</tt> and <tt>shutdown</tt> scripts created by
-<a href="s6-linux-init-maker.html">s6-linux-init-maker</a>; those scripts
-will call them with the correct <tt>-R&nbsp;<em>tmpfsdir</em></tt> option.
-The scripts should typically be linked to <tt>/sbin</tt> after
-<a href="s6-linux-init-maker.html">s6-linux-init-maker</a> execution, to
-provide drop-in replacements for the <em>sysvinit</em> programs with the
-same names. </li>
-</ul>
-
-</body>
-</html>