mirror of
https://github.com/systemd/systemd.git
synced 2024-11-06 16:59:03 +03:00
72f4d9669c
This is a recurring submission and includes corrections to various issue spotted. I guess I can just skip over reporting ubiquitous comma placement fixes…
1301 lines
50 KiB
XML
1301 lines
50 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemctl">
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<refentryinfo>
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<title>systemctl</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemctl</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemctl</refname>
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<refpurpose>Control the systemd system and service manager</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">COMMAND</arg>
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<arg choice="opt" rep="repeat">NAME</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>systemctl</command> may be used to
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introspect and control the state of the
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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system and service manager.</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>-h</option></term>
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<term><option>--help</option></term>
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<listitem><para>Prints a short help
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text and exits.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--version</option></term>
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<listitem>
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<para>Prints a short version string and exits.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-t</option></term>
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<term><option>--type=</option></term>
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<listitem>
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<para>The argument should be a comma-separated list of unit
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types such as <option>service</option> and
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<option>socket</option>.
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</para>
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<para>If one of the arguments is a unit type, when listing
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units, limit display to certain unit types. Otherwise, units
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of all types will be shown.</para>
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<para>As a special case, if one of the arguments is
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<option>help</option>, a list of allowed values will be
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printed and the program will exit.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--state=</option></term>
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<listitem>
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<para>The argument should be a comma-separated list of unit LOAD,
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SUB, or ACTIVE states. When listing units, show only those
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in specified states.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p</option></term>
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<term><option>--property=</option></term>
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<listitem>
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<para>When showing unit/job/manager properties with the
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<command>show</command> command, limit display to certain
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properties as specified as argument. If not specified, all
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set properties are shown. The argument should be a
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comma-separated list of property names, such as
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<literal>MainPID</literal>. If specified more than once, all
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properties with the specified names are shown.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-a</option></term>
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<term><option>--all</option></term>
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<listitem>
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<para>When listing units, show all loaded units, regardless
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of their state, including inactive units. When showing
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unit/job/manager properties, show all properties regardless
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whether they are set or not.</para>
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<para>To list all units installed on the system, use the
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<command>list-unit-files</command> command instead.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--reverse</option></term>
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<listitem>
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<para>Show reverse dependencies between units with
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<command>list-dependencies</command>, i.e. units with
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dependencies of type <varname>Wants=</varname> or
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<varname>Requires=</varname> on the given unit.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--after</option></term>
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<term><option>--before</option></term>
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<listitem>
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<para>Show which units are started after or before
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with <command>list-dependencies</command>, respectively.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-l</option></term>
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<term><option>--full</option></term>
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<listitem>
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<para>Do not ellipsize unit names, process tree entries, and
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truncate unit descriptions in the output of
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<command>list-units</command> and
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<command>list-jobs</command>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--fail</option></term>
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<listitem>
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<para>If the requested operation conflicts with a pending
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unfinished job, fail the command. If this is not specified,
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the requested operation will replace the pending job, if
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necessary. Do not confuse with
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<option>--failed</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--show-types</option></term>
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<listitem>
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<para>When showing sockets, show the type of the socket.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--irreversible</option></term>
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<listitem>
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<para>Mark this transaction's jobs as irreversible. This prevents
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future conflicting transactions from replacing these jobs.
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The jobs can still be cancelled using the <command>cancel</command>
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command.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--ignore-dependencies</option></term>
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<listitem>
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<para>When enqueuing a new job, ignore all its dependencies
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and execute it immediately. If passed, no required units of
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the unit passed will be pulled in, and no ordering
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dependencies will be honored. This is mostly a debugging and
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rescue tool for the administrator and should not be used by
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applications.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-i</option></term>
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<term><option>--ignore-inhibitors</option></term>
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<listitem>
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<para>When system shutdown or a sleep state is requested,
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ignore inhibitor locks. Applications can establish inhibitor
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locks to avoid that certain important operations (such as CD
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burning or suchlike) are interrupted by system shutdown or a
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sleep state. Any user may take these locks and privileged
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users may override these locks. If any locks are taken,
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shutdown and sleep state requests will normally fail
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(regardless if privileged or not) and a list of active locks
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is printed. However, if <option>--ignore-inhibitors</option>
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is specified, the locks are ignored and not printed, and the
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operation attempted anyway, possibly requiring additional
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privileges.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-q</option></term>
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<term><option>--quiet</option></term>
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<listitem>
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<para>Suppress output to standard output in
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<command>snapshot</command>,
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<command>is-active</command>,
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<command>is-failed</command>,
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<command>enable</command> and
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<command>disable</command>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-block</option></term>
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<listitem>
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<para>Do not synchronously wait for the requested operation
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to finish. If this is not specified, the job will be
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verified, enqueued and <command>systemctl</command> will
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wait until it is completed. By passing this argument, it is
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only verified and enqueued.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-legend</option></term>
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<listitem>
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<para>Do not print a legend, i.e. the column headers and
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the footer with hints.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-pager</option></term>
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<listitem>
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<para>Do not pipe output into a pager.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--system</option></term>
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<listitem>
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<para>Talk to the systemd system manager. (Default)</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--user</option></term>
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<listitem>
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<para>Talk to the systemd manager of the calling
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user.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-wall</option></term>
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<listitem>
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<para>Do not send wall message before halt, power-off,
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reboot.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--global</option></term>
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<listitem>
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<para>When used with <command>enable</command> and
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<command>disable</command>, operate on the global user
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configuration directory, thus enabling or disabling a unit
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file globally for all future logins of all users.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-reload</option></term>
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<listitem>
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<para>When used with <command>enable</command> and
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<command>disable</command>, do not implicitly reload daemon
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configuration after executing the changes.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-ask-password</option></term>
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<listitem>
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<para>When used with <command>start</command> and related
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commands, disables asking for passwords. Background services
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may require input of a password or passphrase string, for
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example to unlock system hard disks or cryptographic
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certificates. Unless this option is specified and the
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command is invoked from a terminal,
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<command>systemctl</command> will query the user on the
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terminal for the necessary secrets. Use this option to
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switch this behavior off. In this case, the password must be
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supplied by some other means (for example graphical password
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agents) or the service might fail. This also disables
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querying the user for authentication for privileged
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operations.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--kill-who=</option></term>
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<listitem>
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<para>When used with <command>kill</command>, choose which
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processes to kill. Must be one of <option>main</option>,
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<option>control</option> or <option>all</option> to select
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whether to kill only the main process of the unit, the
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control process or all processes of the unit. If omitted,
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defaults to <option>all</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-s</option></term>
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<term><option>--signal=</option></term>
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<listitem>
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<para>When used with <command>kill</command>, choose which
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signal to send to selected processes. Must be one of the
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well known signal specifiers such as <constant>SIGTERM</constant>, <constant>SIGINT</constant> or
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<constant>SIGSTOP</constant>. If omitted, defaults to
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<option>SIGTERM</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-f</option></term>
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<term><option>--force</option></term>
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<listitem>
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<para>When used with <command>enable</command>, overwrite
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any existing conflicting symlinks.</para>
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<para>When used with <command>halt</command>,
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<command>poweroff</command>, <command>reboot</command> or
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<command>kexec</command>, execute the selected operation
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without shutting down all units. However, all processes will
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be killed forcibly and all file systems are unmounted or
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remounted read-only. This is hence a drastic but relatively
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safe option to request an immediate reboot. If
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<option>--force</option> is specified twice for these
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operations, they will be executed immediately without
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terminating any processes or umounting any file
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systems. Warning: specifying <option>--force</option> twice
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with any of these operations might result in data
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loss.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--root=</option></term>
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<listitem>
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<para>When used with
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<command>enable</command>/<command>disable</command>/<command>is-enabled</command>
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(and related commands), use alternative root path when
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looking for unit files.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--runtime</option></term>
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<listitem>
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<para>When used with <command>enable</command>,
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<command>disable</command>, <command>is-enabled</command>
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(and related commands), make changes only temporarily, so
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that they are lost on the next reboot. This will have the
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effect that changes are not made in subdirectories of
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<filename>/etc</filename> but in <filename>/run</filename>,
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with identical immediate effects, however, since the latter
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is lost on reboot, the changes are lost too.</para>
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<para>Similar, when used with
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<command>set-property</command>, make changes only
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temporarily, so that they are lost on the next
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reboot.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-H</option></term>
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<term><option>--host</option></term>
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<listitem>
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<para>Execute operation remotely. Specify a hostname, or
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username and hostname separated by <literal>@</literal>, to connect to. This
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will use SSH to talk to the remote systemd
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instance.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-P</option></term>
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<term><option>--privileged</option></term>
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|
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<listitem>
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<para>Acquire privileges via PolicyKit before executing the
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operation.</para>
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</listitem>
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</varlistentry>
|
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<varlistentry>
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<term><option>-n</option></term>
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<term><option>--lines=</option></term>
|
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|
|
<listitem>
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<para>When used with <command>status</command>, controls the
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number of journal lines to show, counting from the most
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recent ones. Takes a positive integer argument. Defaults to
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10.</para>
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</listitem>
|
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</varlistentry>
|
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|
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<varlistentry>
|
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<term><option>-o</option></term>
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<term><option>--output=</option></term>
|
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|
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<listitem>
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<para>When used with <command>status</command>, controls the
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formatting of the journal entries that are shown. For the
|
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available choices, see
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
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Defaults to <literal>short</literal>.</para>
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</listitem>
|
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</varlistentry>
|
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|
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<varlistentry>
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<term><option>--plain</option></term>
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|
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<listitem>
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<para>When used with <command>list-dependencies</command>,
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the output is printed as a list instead of a tree.</para>
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</listitem>
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</varlistentry>
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|
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</variablelist>
|
|
</refsect1>
|
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|
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<refsect1>
|
|
<title>Commands</title>
|
|
|
|
<para>The following commands are understood:</para>
|
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|
|
<refsect2>
|
|
<title>Unit Commands</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><command>list-units</command></term>
|
|
|
|
<listitem>
|
|
<para>List known units (subject to limitations specified
|
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with <option>-t</option>).</para>
|
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|
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<para>This is the default command.</para>
|
|
</listitem>
|
|
</varlistentry>
|
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|
|
<varlistentry>
|
|
<term><command>list-sockets</command></term>
|
|
|
|
<listitem>
|
|
<para>List socket units ordered by the listening address. Produces output
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|
similar to
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<programlisting>
|
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LISTEN UNIT ACTIVATES
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/dev/initctl systemd-initctl.socket systemd-initctl.service
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...
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[::]:22 sshd.socket sshd.service
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kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
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5 sockets listed.
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</programlisting>
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Note: because the addresses might contains spaces, this output
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is not suitable for programmatic consumption.
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|
</para>
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|
|
<para>See also the options <option>--show-types</option>,
|
|
<option>--all</option>, and <option>--failed</option>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>start <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Start (activate) one or more units specified on the
|
|
command line.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>stop <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Stop (deactivate) one or more units specified on the
|
|
command line.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>reload <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Asks all units listed on the command line to reload
|
|
their configuration. Note that this will reload the
|
|
service-specific configuration, not the unit configuration
|
|
file of systemd. If you want systemd to reload the
|
|
configuration file of a unit, use the
|
|
<command>daemon-reload</command> command. In other words:
|
|
for the example case of Apache, this will reload Apache's
|
|
<filename>httpd.conf</filename> in the web server, not the
|
|
<filename>apache.service</filename> systemd unit
|
|
file.</para>
|
|
|
|
<para>This command should not be confused with the
|
|
<command>daemon-reload</command> or <command>load</command>
|
|
commands.</para>
|
|
</listitem>
|
|
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>restart <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Restart one or more units specified on the command
|
|
line. If the units are not running yet, they will be
|
|
started.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>try-restart <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Restart one or more units specified on the command
|
|
line if the units are running. This does nothing if units are not
|
|
running. Note that, for compatibility with Red Hat init
|
|
scripts, <command>condrestart</command> is equivalent to this
|
|
command.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>reload-or-restart <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Reload one or more units if they support it. If not,
|
|
restart them instead. If the units are not running yet, they
|
|
will be started.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>reload-or-try-restart <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Reload one or more units if they support it. If not,
|
|
restart them instead. This does nothing if the units are not
|
|
running. Note that, for compatibility with SysV init scripts,
|
|
<command>force-reload</command> is equivalent to this
|
|
command.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>isolate <replaceable>NAME</replaceable></command></term>
|
|
|
|
<listitem>
|
|
<para>Start the unit specified on the command line and its
|
|
dependencies and stop all others.</para>
|
|
|
|
<para>This is similar to changing the runlevel in a
|
|
traditional init system. The <command>isolate</command>
|
|
command will immediately stop processes that are not enabled
|
|
in the new unit, possibly including the graphical
|
|
environment or terminal you are currently using.</para>
|
|
|
|
<para>Note that this is allowed only on units where
|
|
<option>AllowIsolate=</option> is enabled. See
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>kill <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Send a signal to one or more processes of the
|
|
unit. Use <option>--kill-who=</option> to select which
|
|
process to kill. Use <option>--kill-mode=</option> to select
|
|
the kill mode and <option>--signal=</option> to select the
|
|
signal to send.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>is-active <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Check whether any of the specified units are active
|
|
(i.e. running). Returns an exit code 0 if at least one is
|
|
active, non-zero otherwise. Unless <option>--quiet</option>
|
|
is specified, this will also print the current unit state to
|
|
STDOUT.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>is-failed <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Check whether any of the specified units are in a "failed" state.
|
|
Returns an exit code 0 if at least one has failed, non-zero
|
|
otherwise. Unless <option>--quiet</option> is specified, this
|
|
will also print the current unit state to
|
|
STDOUT.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>status [<replaceable>NAME</replaceable>...|<replaceable>PID</replaceable>...]</command></term>
|
|
|
|
<listitem>
|
|
<para>Show terse runtime status information about one or
|
|
more units, followed by most recent log data from the
|
|
journal. If no units are specified, show all units (subject
|
|
to limitations specified with <option>-t</option>). If a PID
|
|
is passed, show information about the unit the process
|
|
belongs to.</para>
|
|
|
|
<para>This function is intended to generate human-readable
|
|
output. If you are looking for computer-parsable output, use
|
|
<command>show</command> instead.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>show [<replaceable>NAME</replaceable>...|<replaceable>JOB</replaceable>...]</command></term>
|
|
|
|
<listitem>
|
|
<para>Show properties of one or more units, jobs, or the
|
|
manager itself. If no argument is specified, properties of
|
|
the manager will be shown. If a unit name is specified,
|
|
properties of the unit is shown, and if a job id is
|
|
specified, properties of the job is shown. By default, empty
|
|
properties are suppressed. Use <option>--all</option> to
|
|
show those too. To select specific properties to show, use
|
|
<option>--property=</option>. This command is intended to be
|
|
used whenever computer-parsable output is required. Use
|
|
<command>status</command> if you are looking for formatted
|
|
human-readable output.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>set-property <replaceable>NAME</replaceable> <replaceable>ASSIGNMENT</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Set the specified unit properties at runtime where
|
|
this is supported. This allows changing configuration
|
|
parameter properties such as resource control settings at
|
|
runtime. Not all properties may be changed at runtime, but
|
|
many resource control settings (primarily those in
|
|
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>)
|
|
may. The changes are applied instantly, and stored on disk
|
|
for future boots, unless <option>--runtime</option> is
|
|
passed, in which case the settings only apply until the
|
|
next reboot. The syntax of the property assignment follows
|
|
closely the syntax of assignments in unit files.</para>
|
|
|
|
<para>Example: <command>systemctl set-property foobar.service CPUShares=777</command></para>
|
|
|
|
<para>Note that this command allows changing multiple
|
|
properties at the same time, which is preferable over
|
|
setting them individually. Like unit file configuration
|
|
settings, assigning the empty list to list parameters will
|
|
reset the list.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>help <replaceable>NAME</replaceable>...|<replaceable>PID</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Show manual pages for one or more units, if
|
|
available. If a PID is given, the manual pages for the unit
|
|
the process belongs to are shown.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>reset-failed [<replaceable>NAME</replaceable>...]</command></term>
|
|
|
|
<listitem>
|
|
<para>Reset the <literal>failed</literal> state of the
|
|
specified units, or if no unit name is passed, reset the state of all
|
|
units. When a unit fails in some way (i.e. process exiting
|
|
with non-zero error code, terminating abnormally or timing
|
|
out), it will automatically enter the
|
|
<literal>failed</literal> state and its exit code and status
|
|
is recorded for introspection by the administrator until the
|
|
service is restarted or reset with this command.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>list-dependencies <replaceable>NAME</replaceable></command></term>
|
|
|
|
<listitem>
|
|
<para>Shows required and wanted units of the specified
|
|
unit. If no unit is specified,
|
|
<filename>default.target</filename> is implied. Target units
|
|
are recursively expanded. When <option>--all</option> is
|
|
passed, all other units are recursively expanded as
|
|
well.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Unit File Commands</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><command>list-unit-files</command></term>
|
|
|
|
<listitem>
|
|
<para>List installed unit files.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>enable <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Enable one or more unit files or unit file instances,
|
|
as specified on the command line. This will create a number
|
|
of symlinks as encoded in the <literal>[Install]</literal>
|
|
sections of the unit files. After the symlinks have been
|
|
created, the systemd configuration is reloaded (in a way that
|
|
is equivalent to <command>daemon-reload</command>) to ensure
|
|
the changes are taken into account immediately. Note that
|
|
this does <emphasis>not</emphasis> have the effect of also
|
|
starting any of the units being enabled. If this
|
|
is desired, a separate <command>start</command> command must
|
|
be invoked for the unit. Also note that in case of instance
|
|
enablement, symlinks named the same as instances are created in
|
|
the install location, however they all point to the same
|
|
template unit file.</para>
|
|
|
|
<para>This command will print the actions executed. This
|
|
output may be suppressed by passing <option>--quiet</option>.
|
|
</para>
|
|
|
|
<para>Note that this operation creates only the suggested
|
|
symlinks for the units. While this command is the
|
|
recommended way to manipulate the unit configuration
|
|
directory, the administrator is free to make additional
|
|
changes manually by placing or removing symlinks in the
|
|
directory. This is particularly useful to create
|
|
configurations that deviate from the suggested default
|
|
installation. In this case, the administrator must make sure
|
|
to invoke <command>daemon-reload</command> manually as
|
|
necessary to ensure the changes are taken into account.
|
|
</para>
|
|
|
|
<para>Enabling units should not be confused with starting
|
|
(activating) units, as done by the <command>start</command>
|
|
command. Enabling and starting units is orthogonal: units
|
|
may be enabled without being started and started without
|
|
being enabled. Enabling simply hooks the unit into various
|
|
suggested places (for example, so that the unit is
|
|
automatically started on boot or when a particular kind of
|
|
hardware is plugged in). Starting actually spawns the daemon
|
|
process (in case of service units), or binds the socket (in
|
|
case of socket units), and so on.</para>
|
|
|
|
<para>Depending on whether <option>--system</option>,
|
|
<option>--user</option>, <option>--runtime</option>,
|
|
or <option>--global</option> is specified, this enables the unit
|
|
for the system, for the calling user only, for only this boot of
|
|
the system, or for all future logins of all users, or only this
|
|
boot. Note that in the last case, no systemd daemon
|
|
configuration is reloaded.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>disable <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Disables one or more units. This removes all symlinks
|
|
to the specified unit files from the unit configuration
|
|
directory, and hence undoes the changes made by
|
|
<command>enable</command>. Note however that this removes
|
|
all symlinks to the unit files (i.e. including manual
|
|
additions), not just those actually created by
|
|
<command>enable</command>. This call implicitly reloads the
|
|
systemd daemon configuration after completing the disabling
|
|
of the units. Note that this command does not implicitly
|
|
stop the units that are being disabled. If this is desired,
|
|
an additional <command>stop</command> command should be
|
|
executed afterwards.</para>
|
|
|
|
<para>This command will print the actions executed. This
|
|
output may be suppressed by passing <option>--quiet</option>.
|
|
</para>
|
|
|
|
<para>This command honors <option>--system</option>,
|
|
<option>--user</option>, <option>--runtime</option> and
|
|
<option>--global</option> in a similar way as
|
|
<command>enable</command>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>is-enabled <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Checks whether any of the specified unit files are
|
|
enabled (as with <command>enable</command>). Returns an exit
|
|
code of 0 if at least one is enabled, non-zero
|
|
otherwise. Prints the current enable status. To suppress
|
|
this output, use <option>--quiet</option>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>reenable <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Reenable one or more unit files, as specified on the
|
|
command line. This is a combination of
|
|
<command>disable</command> and <command>enable</command> and
|
|
is useful to reset the symlinks a unit is enabled with to
|
|
the defaults configured in the <literal>[Install]</literal>
|
|
section of the unit file.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>preset <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Reset one or more unit files, as specified on the
|
|
command line, to the defaults configured in the preset
|
|
policy files. This has the same effect as
|
|
<command>disable</command> or <command>enable</command>,
|
|
depending how the unit is listed in the preset files. For
|
|
more information on the preset policy format, see
|
|
<citerefentry><refentrytitle>systemd.preset</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
|
|
For more information on the concept of presets, please
|
|
consult the
|
|
<ulink url="http://freedesktop.org/wiki/Software/systemd/Preset">Preset</ulink>
|
|
document.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>mask <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Mask one or more unit files, as specified on the
|
|
command line. This will link these units to
|
|
<filename>/dev/null</filename>, making it impossible to
|
|
start them. This is a stronger version of
|
|
<command>disable</command>, since it prohibits all kinds of
|
|
activation of the unit, including manual activation. Use
|
|
this option with care. This honors the
|
|
<option>--runtime</option> option to only mask temporarily
|
|
until the next reoobt of the system.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>unmask <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Unmask one or more unit files, as specified on the
|
|
command line. This will undo the effect of
|
|
<command>mask</command>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>link <replaceable>FILENAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Link a unit file that is not in the unit file search
|
|
paths into the unit file search path. This requires an
|
|
absolute path to a unit file. The effect of this can be
|
|
undone with <command>disable</command>. The effect of this
|
|
command is that a unit file is available for
|
|
<command>start</command> and other commands although it
|
|
is not installed directly in the unit search path.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>get-default</command></term>
|
|
|
|
<listitem>
|
|
<para>Get the default target specified
|
|
via <filename>default.target</filename> link.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><command>set-default <replaceable>NAME</replaceable></command></term>
|
|
|
|
<listitem>
|
|
<para>Set the default target to boot into. Command links
|
|
<filename>default.target</filename> to the given unit.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Job Commands</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><command>list-jobs</command></term>
|
|
|
|
<listitem>
|
|
<para>List jobs that are in progress.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>cancel <replaceable>JOB</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Cancel one or more jobs specified on the command line
|
|
by their numeric job IDs. If no job ID is specified, cancel
|
|
all pending jobs.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Snapshot Commands</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><command>snapshot [<replaceable>NAME</replaceable>]</command></term>
|
|
|
|
<listitem>
|
|
<para>Create a snapshot. If a snapshot name is specified,
|
|
the new snapshot will be named after it. If none is
|
|
specified, an automatic snapshot name is generated. In either
|
|
case, the snapshot name used is printed to STDOUT, unless
|
|
<option>--quiet</option> is specified.</para>
|
|
|
|
<para>A snapshot refers to a saved state of the systemd
|
|
manager. It is implemented itself as a unit that is
|
|
generated dynamically with this command and has dependencies
|
|
on all units active at the time. At a later time, the user
|
|
may return to this state by using the
|
|
<command>isolate</command> command on the snapshot unit.
|
|
</para>
|
|
|
|
<para>Snapshots are only useful for saving and restoring
|
|
which units are running or are stopped, they do not
|
|
save/restore any other state. Snapshots are dynamic and lost
|
|
on reboot.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>delete <replaceable>NAME</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Remove a snapshot previously created with
|
|
<command>snapshot</command>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Environment Commands</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><command>show-environment</command></term>
|
|
|
|
<listitem>
|
|
<para>Dump the systemd manager environment block. The
|
|
environment block will be dumped in straight-forward form
|
|
suitable for sourcing into a shell script. This environment
|
|
block will be passed to all processes the manager
|
|
spawns.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>set-environment <replaceable>VARIABLE=VALUE</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Set one or more systemd manager environment variables,
|
|
as specified on the command line.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>unset-environment <replaceable>VARIABLE</replaceable>...</command></term>
|
|
|
|
<listitem>
|
|
<para>Unset one or more systemd manager environment
|
|
variables. If only a variable name is specified, it will be
|
|
removed regardless of its value. If a variable and a value
|
|
are specified, the variable is only removed if it has the
|
|
specified value.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Manager Lifecycle Commands</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><command>daemon-reload</command></term>
|
|
|
|
<listitem>
|
|
<para>Reload systemd manager configuration. This will reload
|
|
all unit files and recreate the entire dependency
|
|
tree. While the daemon is being reloaded, all sockets systemd
|
|
listens on on behalf of user configuration will stay
|
|
accessible.</para> <para>This command should not be confused
|
|
with the <command>load</command> or
|
|
<command>reload</command> commands.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>daemon-reexec</command></term>
|
|
|
|
<listitem>
|
|
<para>Reexecute the systemd manager. This will serialize the
|
|
manager state, reexecute the process and deserialize the
|
|
state again. This command is of little use except for
|
|
debugging and package upgrades. Sometimes, it might be
|
|
helpful as a heavy-weight <command>daemon-reload</command>.
|
|
While the daemon is being reexecuted, all sockets systemd listening
|
|
on behalf of user configuration will stay accessible.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>System Commands</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><command>default</command></term>
|
|
|
|
<listitem>
|
|
<para>Enter default mode. This is mostly equivalent to
|
|
<command>isolate default.target</command>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>rescue</command></term>
|
|
|
|
<listitem>
|
|
<para>Enter rescue mode. This is mostly equivalent to
|
|
<command>isolate rescue.target</command>, but also prints a
|
|
wall message to all users.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>emergency</command></term>
|
|
|
|
<listitem>
|
|
<para>Enter emergency mode. This is mostly equivalent to
|
|
<command>isolate emergency.target</command>, but also prints
|
|
a wall message to all users.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>halt</command></term>
|
|
|
|
<listitem>
|
|
<para>Shut down and halt the system. This is mostly equivalent to
|
|
<command>start halt.target --irreversible</command>, but also
|
|
prints a wall message to all users. If combined with
|
|
<option>--force</option>, shutdown of all running services is
|
|
skipped, however all processes are killed and all file
|
|
systems are unmounted or mounted read-only, immediately
|
|
followed by the system halt. If <option>--force</option> is
|
|
specified twice, the operation is immediately executed
|
|
without terminating any processes or unmounting any file
|
|
systems. This may result in data loss.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>poweroff</command></term>
|
|
|
|
<listitem>
|
|
<para>Shut down and power-off the system. This is mostly
|
|
equivalent to <command>start poweroff.target --irreversible</command>,
|
|
but also prints a wall message to all users. If combined with
|
|
<option>--force</option>, shutdown of all running services is
|
|
skipped, however all processes are killed and all file
|
|
systems are unmounted or mounted read-only, immediately
|
|
followed by the powering off. If <option>--force</option> is
|
|
specified twice, the operation is immediately executed
|
|
without terminating any processes or unmounting any file
|
|
systems. This may result in data loss.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>reboot</command></term>
|
|
|
|
<listitem>
|
|
<para>Shut down and reboot the system. This is mostly
|
|
equivalent to <command>start reboot.target --irreversible</command>,
|
|
but also prints a wall message to all users. If combined with
|
|
<option>--force</option>, shutdown of all running services is
|
|
skipped, however all processes are killed and all file
|
|
systems are unmounted or mounted read-only, immediately
|
|
followed by the reboot. If <option>--force</option> is
|
|
specified twice, the operation is immediately executed
|
|
without terminating any processes or unmounting any file
|
|
systems. This may result in data loss.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>kexec</command></term>
|
|
|
|
<listitem>
|
|
<para>Shut down and reboot the system via kexec. This is
|
|
mostly equivalent to <command>start kexec.target --irreversible</command>,
|
|
but also prints a wall message to all users. If combined
|
|
with <option>--force</option>, shutdown of all running
|
|
services is skipped, however all processes are killed and
|
|
all file systems are unmounted or mounted read-only,
|
|
immediately followed by the reboot.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>exit</command></term>
|
|
|
|
<listitem>
|
|
<para>Ask the systemd manager to quit. This is only
|
|
supported for user service managers (i.e. in conjunction
|
|
with the <option>--user</option> option) and will fail
|
|
otherwise.</para>
|
|
</listitem>
|
|
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>suspend</command></term>
|
|
|
|
<listitem>
|
|
<para>Suspend the system. This will trigger activation of
|
|
the special <filename>suspend.target</filename> target.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>hibernate</command></term>
|
|
|
|
<listitem>
|
|
<para>Hibernate the system. This will trigger activation of
|
|
the special <filename>hibernate.target</filename> target.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>hybrid-sleep</command></term>
|
|
|
|
<listitem>
|
|
<para>Hibernate and suspend the system. This will trigger
|
|
activation of the special
|
|
<filename>hybrid-sleep.target</filename> target.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><command>switch-root <replaceable>ROOT</replaceable> [<replaceable>INIT</replaceable>]</command></term>
|
|
|
|
<listitem>
|
|
<para>Switches to a different root directory and executes a
|
|
new system manager process below it. This is intended for
|
|
usage in initial RAM disks ("initrd"), and will transition
|
|
from the initrd's system manager process (a.k.a "init"
|
|
process) to the main system manager process. This call takes two
|
|
arguments: the directory that is to become the new root directory, and
|
|
the path to the new system manager binary below it to
|
|
execute as PID 1. If the latter is omitted or the empty
|
|
string, a systemd binary will automatically be searched for
|
|
and used as init. If the system manager path is omitted or
|
|
equal to the empty string, the state of the initrd's system
|
|
manager process is passed to the main system manager, which
|
|
allows later introspection of the state of the services
|
|
involved in the initrd boot.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Exit status</title>
|
|
|
|
<para>On success, 0 is returned, a non-zero failure
|
|
code otherwise.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Environment</title>
|
|
|
|
<variablelist class='environment-variables'>
|
|
<varlistentry>
|
|
<term><varname>$SYSTEMD_PAGER</varname></term>
|
|
|
|
<listitem>
|
|
<para>Pager to use when <option>--no-pager</option> is not
|
|
given; overrides <varname>$PAGER</varname>. Setting this to
|
|
an empty string or the value <literal>cat</literal> is
|
|
equivalent to passing
|
|
<option>--no-pager</option>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemadm</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.resource-management</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.preset</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|