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This allows checking from shell scripts whether the system is in a low battery state. It just exposed the code we anyway have in a directly accessible way. This is also very useful for testing things.
80 lines
2.5 KiB
XML
80 lines
2.5 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-ac-power" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-ac-power</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-ac-power</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-ac-power</refname>
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<refpurpose>Report whether we are connected to an external power source</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-ac-power</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-ac-power</command> may be used to check whether the system
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is running on AC power or not. By default it will simply return success (if we
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can detect that we are running on AC power) or failure, with no output.
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This can be useful for example to debug <varname>ConditionACPower=</varname> (see
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>).</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>-v</option></term>
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<term><option>--verbose</option></term>
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<listitem><para>Show result as text instead of just returning success or failure.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--low</option></term>
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<listitem><para>Instead of showing AC power state, show low battery state. In this case will return
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zero if all batteries are currently discharging and below 5% of maximum charge. Returns non-zero
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otherwise.</para></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success (running on AC power), 0 is returned, a non-zero failure code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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