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systemd/man/systemctl.xml
Michal Schmidt 7152869f0a Merge pull request #1869 from poettering/kill-overridable 
Remove support for RequiresOverridable= and RequisiteOverridable=
2015-11-13 14:04:34 +01:00

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<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
<!ENTITY % entities SYSTEM "custom-entities.ent" >
%entities;
]>
<!--
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="systemctl"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>systemctl</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>systemctl</refentrytitle>
<manvolnum>1</manvolnum>
</refmeta>
<refnamediv>
<refname>systemctl</refname>
<refpurpose>Control the systemd system and service manager</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>systemctl</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
<arg choice="plain">COMMAND</arg>
<arg choice="opt" rep="repeat">NAME</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>systemctl</command> may be used to introspect and
control the state of the <literal>systemd</literal> system and
service manager. Please refer to
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
for an introduction into the basic concepts and functionality this
tool manages.</para>
</refsect1>
<refsect1>
<title>Options</title>
<para>The following options are understood:</para>
<variablelist>
<varlistentry>
<term><option>-t</option></term>
<term><option>--type=</option></term>
<listitem>
<para>The argument should be a comma-separated list of unit
types such as <option>service</option> and
<option>socket</option>.
</para>
<para>If one of the arguments is a unit type, when listing
units, limit display to certain unit types. Otherwise, units
of all types will be shown.</para>
<para>As a special case, if one of the arguments is
<option>help</option>, a list of allowed values will be
printed and the program will exit.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--state=</option></term>
<listitem>
<para>The argument should be a comma-separated list of unit
LOAD, SUB, or ACTIVE states. When listing units, show only
those in the specified states. Use <option>--state=failed</option>
to show only failed units.</para>
<para>As a special case, if one of the arguments is
<option>help</option>, a list of allowed values will be
printed and the program will exit.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-p</option></term>
<term><option>--property=</option></term>
<listitem>
<para>When showing unit/job/manager properties with the
<command>show</command> command, limit display to properties
specified in the argument. The argument should be a
comma-separated list of property names, such as
<literal>MainPID</literal>. Unless specified, all known
properties are shown. If specified more than once, all
properties with the specified names are shown. Shell
completion is implemented for property names.</para>
<para>For the manager itself,
<command>systemctl show</command> will show all available
properties. Those properties are documented in
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
<para>Properties for units vary by unit type, so showing any
unit (even a non-existent one) is a way to list properties
pertaining to this type. Similarly, showing any job will list
properties pertaining to all jobs. Properties for units are
documented in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
and the pages for individual unit types
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
etc.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-a</option></term>
<term><option>--all</option></term>
<listitem>
<para>When listing units, show all loaded units, regardless
of their state, including inactive units. When showing
unit/job/manager properties, show all properties regardless
whether they are set or not.</para>
<para>To list all units installed on the system, use the
<command>list-unit-files</command> command instead.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-r</option></term>
<term><option>--recursive</option></term>
<listitem>
<para>When listing units, also show units of local
containers. Units of local containers will be prefixed with
the container name, separated by a single colon character
(<literal>:</literal>).</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--reverse</option></term>
<listitem>
<para>Show reverse dependencies between units with
<command>list-dependencies</command>, i.e. follow
dependencies of type <varname>WantedBy=</varname>,
<varname>RequiredBy=</varname>,
<varname>PartOf=</varname>, <varname>BoundBy=</varname>,
instead of <varname>Wants=</varname> and similar.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--after</option></term>
<listitem>
<para>With <command>list-dependencies</command>, show the
units that are ordered before the specified unit. In other
words, recursively list units following the
<varname>After=</varname> dependency.</para>
<para>Note that any <varname>After=</varname> dependency is
automatically mirrored to create a
<varname>Before=</varname> dependency. Temporal dependencies
may be specified explicitly, but are also created implicitly
for units which are <varname>WantedBy=</varname> targets
(see
<citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry>),
and as a result of other directives (for example
<varname>RequiresMountsFor=</varname>). Both explicitly
and implicitly introduced dependencies are shown with
<command>list-dependencies</command>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--before</option></term>
<listitem>
<para>With <command>list-dependencies</command>, show the
units that are ordered after the specified unit. In other
words, recursively list units following the
<varname>Before=</varname> dependency.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-l</option></term>
<term><option>--full</option></term>
<listitem>
<para>Do not ellipsize unit names, process tree entries,
journal output, or truncate unit descriptions in the output
of <command>status</command>, <command>list-units</command>,
<command>list-jobs</command>, and
<command>list-timers</command>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--show-types</option></term>
<listitem>
<para>When showing sockets, show the type of the socket.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--job-mode=</option></term>
<listitem>
<para>When queuing a new job, this option controls how to deal with
already queued jobs. It takes one of <literal>fail</literal>,
<literal>replace</literal>,
<literal>replace-irreversibly</literal>,
<literal>isolate</literal>,
<literal>ignore-dependencies</literal>,
<literal>ignore-requirements</literal> or
<literal>flush</literal>. Defaults to
<literal>replace</literal>, except when the
<command>isolate</command> command is used which implies the
<literal>isolate</literal> job mode.</para>
<para>If <literal>fail</literal> is specified and a requested
operation conflicts with a pending job (more specifically:
causes an already pending start job to be reversed into a stop
job or vice versa), cause the operation to fail.</para>
<para>If <literal>replace</literal> (the default) is
specified, any conflicting pending job will be replaced, as
necessary.</para>
<para>If <literal>replace-irreversibly</literal> is specified,
operate like <literal>replace</literal>, but also mark the new
jobs as irreversible. This prevents future conflicting
transactions from replacing these jobs (or even being enqueued
while the irreversible jobs are still pending). Irreversible
jobs can still be cancelled using the <command>cancel</command>
command.</para>
<para><literal>isolate</literal> is only valid for start
operations and causes all other units to be stopped when the
specified unit is started. This mode is always used when the
<command>isolate</command> command is used.</para>
<para><literal>flush</literal> will cause all queued jobs to
be canceled when the new job is enqueued.</para>
<para>If <literal>ignore-dependencies</literal> is specified,
then all unit dependencies are ignored for this new job and
the operation is executed immediately. If passed, no required
units of the unit passed will be pulled in, and no ordering
dependencies will be honored. This is mostly a debugging and
rescue tool for the administrator and should not be used by
applications.</para>
<para><literal>ignore-requirements</literal> is similar to
<literal>ignore-dependencies</literal>, but only causes the
requirement dependencies to be ignored, the ordering
dependencies will still be honoured.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--fail</option></term>
<listitem>
<para>Shorthand for <option>--job-mode=</option>fail.</para>
<para>When used with the <command>kill</command> command,
if no units were killed, the operation results in an error.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-i</option></term>
<term><option>--ignore-inhibitors</option></term>
<listitem>
<para>When system shutdown or a sleep state is requested,
ignore inhibitor locks. Applications can establish inhibitor
locks to avoid that certain important operations (such as CD
burning or suchlike) are interrupted by system shutdown or a
sleep state. Any user may take these locks and privileged
users may override these locks. If any locks are taken,
shutdown and sleep state requests will normally fail
(regardless of whether privileged or not) and a list of active locks
is printed. However, if <option>--ignore-inhibitors</option>
is specified, the locks are ignored and not printed, and the
operation attempted anyway, possibly requiring additional
privileges.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-q</option></term>
<term><option>--quiet</option></term>
<listitem>
<para>Suppress printing of the results of various commands
and also the hints about truncated log lines. This does not
suppress output of commands for which the printed output is
the only result (like <command>show</command>). Errors are
always printed.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--no-block</option></term>
<listitem>
<para>Do not synchronously wait for the requested operation
to finish. If this is not specified, the job will be
verified, enqueued and <command>systemctl</command> will
wait until the unit's start-up is completed. By passing this
argument, it is only verified and enqueued.</para>
</listitem>
</varlistentry>
<xi:include href="user-system-options.xml" xpointer="user" />
<xi:include href="user-system-options.xml" xpointer="system" />
<!-- we do not document -failed here, as it has been made
redundant by -state=failed, which it predates. To keep
things simple, we only document the new switch, while
keeping the old one around for compatibility only. -->
<varlistentry>
<term><option>--no-wall</option></term>
<listitem>
<para>Do not send wall message before halt, power-off,
reboot.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--global</option></term>
<listitem>
<para>When used with <command>enable</command> and
<command>disable</command>, operate on the global user
configuration directory, thus enabling or disabling a unit
file globally for all future logins of all users.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--no-reload</option></term>
<listitem>
<para>When used with <command>enable</command> and
<command>disable</command>, do not implicitly reload daemon
configuration after executing the changes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--no-ask-password</option></term>
<listitem>
<para>When used with <command>start</command> and related
commands, disables asking for passwords. Background services
may require input of a password or passphrase string, for
example to unlock system hard disks or cryptographic
certificates. Unless this option is specified and the
command is invoked from a terminal,
<command>systemctl</command> will query the user on the
terminal for the necessary secrets. Use this option to
switch this behavior off. In this case, the password must be
supplied by some other means (for example graphical password
agents) or the service might fail. This also disables
querying the user for authentication for privileged
operations.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--kill-who=</option></term>
<listitem>
<para>When used with <command>kill</command>, choose which
processes to send a signal to. Must be one of
<option>main</option>, <option>control</option> or
<option>all</option> to select whether to kill only the main
process, the control process or all processes of the
unit. The main process of the unit is the one that defines
the life-time of it. A control process of a unit is one that
is invoked by the manager to induce state changes of it. For
example, all processes started due to the
<varname>ExecStartPre=</varname>,
<varname>ExecStop=</varname> or
<varname>ExecReload=</varname> settings of service units are
control processes. Note that there is only one control
process per unit at a time, as only one state change is
executed at a time. For services of type
<varname>Type=forking</varname>, the initial process started
by the manager for <varname>ExecStart=</varname> is a
control process, while the process ultimately forked off by
that one is then considered the main process of the unit (if
it can be determined). This is different for service units
of other types, where the process forked off by the manager
for <varname>ExecStart=</varname> is always the main process
itself. A service unit consists of zero or one main process,
zero or one control process plus any number of additional
processes. Not all unit types manage processes of these
types however. For example, for mount units, control processes
are defined (which are the invocations of
<filename>&MOUNT_PATH;</filename> and
<filename>&UMOUNT_PATH;</filename>), but no main process
is defined. If omitted, defaults to
<option>all</option>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-s</option></term>
<term><option>--signal=</option></term>
<listitem>
<para>When used with <command>kill</command>, choose which
signal to send to selected processes. Must be one of the
well-known signal specifiers such as <constant>SIGTERM</constant>, <constant>SIGINT</constant> or
<constant>SIGSTOP</constant>. If omitted, defaults to
<option>SIGTERM</option>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-f</option></term>
<term><option>--force</option></term>
<listitem>
<para>When used with <command>enable</command>, overwrite
any existing conflicting symlinks.</para>
<para>When used with <command>halt</command>,
<command>poweroff</command>, <command>reboot</command> or
<command>kexec</command>, execute the selected operation
without shutting down all units. However, all processes will
be killed forcibly and all file systems are unmounted or
remounted read-only. This is hence a drastic but relatively
safe option to request an immediate reboot. If
<option>--force</option> is specified twice for these
operations, they will be executed immediately without
terminating any processes or unmounting any file
systems. Warning: specifying <option>--force</option> twice
with any of these operations might result in data
loss.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--message=</option></term>
<listitem>
<para>When used with <command>halt</command>,
<command>poweroff</command>, <command>reboot</command> or
<command>kexec</command>, set a short message explaining the reason
for the operation. The message will be logged together with the
default shutdown message.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--now</option></term>
<listitem>
<para>When used with <command>enable</command>, the units
will also be started. When used with <command>disable</command> or
<command>mask</command>, the units will also be stopped. The start
or stop operation is only carried out when the respective enable or
disable operation has been successful.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--root=</option></term>
<listitem>
<para>When used with
<command>enable</command>/<command>disable</command>/<command>is-enabled</command>
(and related commands), use an alternate root path when
looking for unit files.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--runtime</option></term>
<listitem>
<para>When used with <command>enable</command>,
<command>disable</command>, <command>edit</command>,
(and related commands), make changes only temporarily, so
that they are lost on the next reboot. This will have the
effect that changes are not made in subdirectories of
<filename>/etc</filename> but in <filename>/run</filename>,
with identical immediate effects, however, since the latter
is lost on reboot, the changes are lost too.</para>
<para>Similarly, when used with
<command>set-property</command>, make changes only
temporarily, so that they are lost on the next
reboot.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--preset-mode=</option></term>
<listitem>
<para>Takes one of <literal>full</literal> (the default),
<literal>enable-only</literal>,
<literal>disable-only</literal>. When used with the
<command>preset</command> or <command>preset-all</command>
commands, controls whether units shall be disabled and
enabled according to the preset rules, or only enabled, or
only disabled.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-n</option></term>
<term><option>--lines=</option></term>
<listitem>
<para>When used with <command>status</command>, controls the
number of journal lines to show, counting from the most
recent ones. Takes a positive integer argument. Defaults to
10.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-o</option></term>
<term><option>--output=</option></term>
<listitem>
<para>When used with <command>status</command>, controls the
formatting of the journal entries that are shown. For the
available choices, see
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
Defaults to <literal>short</literal>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--firmware-setup</option></term>
<listitem>
<para>When used with the <command>reboot</command> command,
indicate to the system's firmware to boot into setup
mode. Note that this is currently only supported on some EFI
systems and only if the system was booted in EFI
mode.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--plain</option></term>
<listitem>
<para>When used with <command>list-dependencies</command>,
<command>list-units</command> or <command>list-machines</command>, the
the output is printed as a list instead of a tree, and the bullet
circles are omitted.</para>
</listitem>
</varlistentry>
<xi:include href="user-system-options.xml" xpointer="host" />
<xi:include href="user-system-options.xml" xpointer="machine" />
<xi:include href="standard-options.xml" xpointer="no-pager" />
<xi:include href="standard-options.xml" xpointer="no-legend" />
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>
</refsect1>
<refsect1>
<title>Commands</title>
<para>The following commands are understood:</para>
<refsect2>
<title>Unit Commands</title>
<variablelist>
<varlistentry>
<term><command>list-units <optional><replaceable>PATTERN</replaceable>...</optional></command></term>
<listitem>
<para>List known units (subject to limitations specified
with <option>-t</option>). If one or more
<replaceable>PATTERN</replaceable>s are specified, only
units matching one of them are shown.</para>
<para>This is the default command.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>list-sockets <optional><replaceable>PATTERN</replaceable>...</optional></command></term>
<listitem>
<para>List socket units ordered by listening address.
If one or more <replaceable>PATTERN</replaceable>s are
specified, only socket units matching one of them are
shown. Produces output similar to
<programlisting>
LISTEN UNIT ACTIVATES
/dev/initctl systemd-initctl.socket systemd-initctl.service
...
[::]:22 sshd.socket sshd.service
kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
5 sockets listed.</programlisting>
Note: because the addresses might contains spaces, this output
is not suitable for programmatic consumption.
</para>
<para>See also the options <option>--show-types</option>,
<option>--all</option>, and <option>--state=</option>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>list-timers <optional><replaceable>PATTERN</replaceable>...</optional></command></term>
<listitem>
<para>List timer units ordered by the time they elapse
next. If one or more <replaceable>PATTERN</replaceable>s
are specified, only units matching one of them are shown.
</para>
<para>See also the options <option>--all</option> and
<option>--state=</option>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>start <replaceable>PATTERN</replaceable>...</command></term>
<listitem>
<para>Start (activate) one or more units specified on the
command line.</para>
<para>Note that glob patterns operate on a list of currently
loaded units. Units which are not active and are not in a
failed state usually are not loaded, and would not be
matched by any pattern. In addition, in case of
instantiated units, systemd is often unaware of the
instance name until the instance has been started. Therefore,
using glob patterns with <command>start</command>
has limited usefulness.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>stop <replaceable>PATTERN</replaceable>...</command></term>
<listitem>
<para>Stop (deactivate) one or more units specified on the
command line.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>reload <replaceable>PATTERN</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> command.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>restart <replaceable>PATTERN</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>PATTERN</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>PATTERN</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>PATTERN</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. If a unit name with no
extension is given, an extension of
<literal>.target</literal> will be assumed.</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>PATTERN</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>--signal=</option> to select
the signal to send.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>is-active <replaceable>PATTERN</replaceable>...</command></term>
<listitem>
<para>Check whether any of the specified units are active
(i.e. running). Returns an exit code
<constant>0</constant> if at least one is active, or
non-zero otherwise. Unless <option>--quiet</option> is
specified, this will also print the current unit state to
standard output.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>is-failed <replaceable>PATTERN</replaceable>...</command></term>
<listitem>
<para>Check whether any of the specified units are in a
"failed" state. Returns an exit code
<constant>0</constant> if at least one has failed,
non-zero otherwise. Unless <option>--quiet</option> is
specified, this will also print the current unit state to
standard output.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>status</command> <optional><replaceable>PATTERN</replaceable>...|<replaceable>PID</replaceable>...]</optional></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 system status. If
combined with <option>--all</option>, also show the status of
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. By default, this
function only shows 10 lines of output and ellipsizes
lines to fit in the terminal window. This can be changes
with <option>--lines</option> and <option>--full</option>,
see above. In addition, <command>journalctl
--unit=<replaceable>NAME</replaceable></command> or
<command>journalctl
--user-unit=<replaceable>NAME</replaceable></command> use
a similar filter for messages and might be more
convenient.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>show</command> <optional><replaceable>PATTERN</replaceable>...|<replaceable>JOB</replaceable>...</optional></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>cat <replaceable>PATTERN</replaceable>...</command></term>
<listitem>
<para>Show backing files of one or more units. Prints the
"fragment" and "drop-ins" (source files) of units. Each
file is preceded by a comment which includes the file
name.</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>PATTERN</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>PATTERN</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</command>
<optional><replaceable>NAME</replaceable></optional>
</term>
<listitem>
<para>Shows units required and wanted by the specified
unit. This recursively lists units following the
<varname>Requires=</varname>,
<varname>Requisite=</varname>,
<varname>ConsistsOf=</varname>,
<varname>Wants=</varname>, <varname>BindsTo=</varname>
dependencies. If no unit is specified,
<filename>default.target</filename> is implied.</para>
<para>By default, only target units are recursively
expanded. When <option>--all</option> is passed, all other
units are recursively expanded as well.</para>
<para>Options <option>--reverse</option>,
<option>--after</option>, <option>--before</option>
may be used to change what types of dependencies
are shown.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Unit File Commands</title>
<variablelist>
<varlistentry>
<term><command>list-unit-files <optional><replaceable>PATTERN...</replaceable></optional></command></term>
<listitem>
<para>List installed unit files and their enablement state
(as reported by <command>is-enabled</command>). If one or
more <replaceable>PATTERN</replaceable>s are specified,
only units whose filename (just the last component of the
path) matches one of them are shown.</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, either <option>--now</option> should be used
together with this command, or an additional <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>
<para>Using <command>enable</command> on masked units
results in an error.</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, either
<option>--now</option> should be used together with this command, or
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>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.</para>
<para>Use <option>--preset-mode=</option> to control
whether units shall be enabled and disabled, or only
enabled, or only disabled.</para>
<para>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>preset-all</command></term>
<listitem>
<para>Resets all installed unit files to the defaults
configured in the preset policy file (see above).</para>
<para>Use <option>--preset-mode=</option> to control
whether units shall be enabled and disabled, or only
enabled, or only disabled.</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 (see table).
To suppress this output, use <option>--quiet</option>.
</para>
<table>
<title>
<command>is-enabled</command> output
</title>
<tgroup cols='3'>
<thead>
<row>
<entry>Name</entry>
<entry>Description</entry>
<entry>Exit Code</entry>
</row>
</thead>
<tbody>
<row>
<entry><literal>enabled</literal></entry>
<entry morerows='1'>Enabled through a symlink in a <filename>.wants/</filename> or <filename>.requires/</filename> subdirectory of <filename>/etc/systemd/system/</filename> (persistently) or <filename>/run/systemd/system/</filename> (transiently).</entry>
<entry morerows='1'>0</entry>
</row>
<row>
<entry><literal>enabled-runtime</literal></entry>
</row>
<row>
<entry><literal>linked</literal></entry>
<entry morerows='1'>Made available through one or more symlinks to the unit file (permanently in <filename>/etc/systemd/system/</filename> or transiently in <filename>/run/systemd/system/</filename>), even though the unit file might reside outside of the unit file search path.</entry>
<entry morerows='1'>&gt; 0</entry>
</row>
<row>
<entry><literal>linked-runtime</literal></entry>
</row>
<row>
<entry><literal>masked</literal></entry>
<entry morerows='1'>Completely disabled, so that any start operation on it fails (permanently in <filename>/etc/systemd/system/</filename> or transiently in <filename>/run/systemd/systemd/</filename>).</entry>
<entry morerows='1'>&gt; 0</entry>
</row>
<row>
<entry><literal>masked-runtime</literal></entry>
</row>
<row>
<entry><literal>static</literal></entry>
<entry>The unit file is not enabled, and has no provisions for enabling in the <literal>[Install]</literal> section.</entry>
<entry>0</entry>
</row>
<row>
<entry><literal>indirect</literal></entry>
<entry>The unit file itself is not enabled, but it has a non-empty <varname>Also=</varname> setting in the <literal>[Install]</literal> section, listing other unit files that might be enabled.</entry>
<entry>0</entry>
</row>
<row>
<entry><literal>disabled</literal></entry>
<entry>Unit file is not enabled, but contains an <literal>[Install]</literal> section with installation instructions.</entry>
<entry>&gt; 0</entry>
</row>
<row>
<entry><literal>bad</literal></entry>
<entry>Unit file is invalid or another error occured. Note that <command>is-enabled</command> will not actually return this state, but print an error message instead. However the unit file listing printed by <command>list-unit-files</command> might show it.</entry>
<entry>&gt; 0</entry>
</row>
</tbody>
</tgroup>
</table>
</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 enablement and manual
activation. Use this option with care. This honors the
<option>--runtime</option> option to only mask temporarily
until the next reboot of the system. The <option>--now</option>
option can be used to ensure that the units are also stopped.</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>add-wants <replaceable>TARGET</replaceable>
<replaceable>NAME</replaceable>...</command></term>
<term><command>add-requires <replaceable>TARGET</replaceable>
<replaceable>NAME</replaceable>...</command></term>
<listitem>
<para>Adds <literal>Wants=</literal> or <literal>Requires=</literal>
dependencies, respectively, to the specified
<replaceable>TARGET</replaceable> for one or more units. </para>
<para>This command honors <option>--system</option>,
<option>--user</option>, <option>--runtime</option> and
<option>--global</option> in a way similar to
<command>enable</command>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>edit <replaceable>NAME</replaceable>...</command></term>
<listitem>
<para>Edit a drop-in snippet or a whole replacement file if
<option>--full</option> is specified, to extend or override the
specified unit.</para>
<para>Depending on whether <option>--system</option> (the default),
<option>--user</option>, or <option>--global</option> is specified,
this command creates a drop-in file for each unit either for the system,
for the calling user, or for all futures logins of all users. Then,
the editor (see the "Environment" section below) is invoked on
temporary files which will be written to the real location if the
editor exits successfully.</para>
<para>If <option>--full</option> is specified, this will copy the
original units instead of creating drop-in files.</para>
<para>If <option>--runtime</option> is specified, the changes will
be made temporarily in <filename>/run</filename> and they will be
lost on the next reboot.</para>
<para>If the temporary file is empty upon exit, the modification of
the related unit is canceled.</para>
<para>After the units have been edited, systemd configuration is
reloaded (in a way that is equivalent to <command>daemon-reload</command>).
</para>
<para>Note that this command cannot be used to remotely edit units
and that you cannot temporarily edit units which are in
<filename>/etc</filename>, since they take precedence over
<filename>/run</filename>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>get-default</command></term>
<listitem>
<para>Return the default target to boot into. This returns
the target unit name <filename>default.target</filename>
is aliased (symlinked) to.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>set-default <replaceable>NAME</replaceable></command></term>
<listitem>
<para>Set the default target to boot into. This sets
(symlinks) the <filename>default.target</filename> alias
to the given target unit.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Machine Commands</title>
<variablelist>
<varlistentry>
<term><command>list-machines <optional><replaceable>PATTERN</replaceable>...</optional></command></term>
<listitem>
<para>List the host and all running local containers with
their state. If one or more
<replaceable>PATTERN</replaceable>s are specified, only
containers matching one of them are shown.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Job Commands</title>
<variablelist>
<varlistentry>
<term><command>list-jobs <optional><replaceable>PATTERN...</replaceable></optional></command></term>
<listitem>
<para>List jobs that are in progress. If one or more
<replaceable>PATTERN</replaceable>s are specified, only
jobs for units matching one of them are shown.</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>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>
<varlistentry>
<term>
<command>import-environment</command>
<optional><replaceable>VARIABLE...</replaceable></optional>
</term>
<listitem>
<para>Import all, one or more environment variables set on
the client into the systemd manager environment block. If
no arguments are passed, the entire environment block is
imported. Otherwise, a list of one or more environment
variable names should be passed, whose client-side values
are then imported into the manager's environment
block.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Manager Lifecycle Commands</title>
<variablelist>
<varlistentry>
<term><command>daemon-reload</command></term>
<listitem>
<para>Reload the systemd manager configuration. This will
rerun all generators (see
<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>),
reload all unit files, and recreate the entire dependency
tree. While the daemon is being reloaded, all sockets
systemd listens on behalf of user configuration will stay
accessible.</para>
<para>This command should not be confused with the
<command>reload</command> command.</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>is-system-running</command></term>
<listitem>
<para>Checks whether the system is operational. This
returns success (exit code 0) when the system is fully up
and running, specifically not in startup, shutdown or
maintenance mode, and with no failed services. Failure is
returned otherwise (exit code non-zero). In addition, the
current state is printed in a short string to standard
output, see the table below. Use <option>--quiet</option> to
suppress this output.</para>
<table>
<title><command>is-system-running</command> output</title>
<tgroup cols='3'>
<colspec colname='name'/>
<colspec colname='description'/>
<colspec colname='exit-code'/>
<thead>
<row>
<entry>Name</entry>
<entry>Description</entry>
<entry>Exit Code</entry>
</row>
</thead>
<tbody>
<row>
<entry><varname>initializing</varname></entry>
<entry><para>Early bootup, before
<filename>basic.target</filename> is reached
or the <varname>maintenance</varname> state entered.
</para></entry>
<entry>&gt; 0</entry>
</row>
<row>
<entry><varname>starting</varname></entry>
<entry><para>Late bootup, before the job queue
becomes idle for the first time, or one of the
rescue targets are reached.</para></entry>
<entry>&gt; 0</entry>
</row>
<row>
<entry><varname>running</varname></entry>
<entry><para>The system is fully
operational.</para></entry>
<entry>0</entry>
</row>
<row>
<entry><varname>degraded</varname></entry>
<entry><para>The system is operational but one or more
units failed.</para></entry>
<entry>&gt; 0</entry>
</row>
<row>
<entry><varname>maintenance</varname></entry>
<entry><para>The rescue or emergency target is
active.</para></entry>
<entry>&gt; 0</entry>
</row>
<row>
<entry><varname>stopping</varname></entry>
<entry><para>The manager is shutting
down.</para></entry>
<entry>&gt; 0</entry>
</row>
<row>
<entry><varname>offline</varname></entry>
<entry><para>The manager is not
running. Specifically, this is the operational
state if an incompatible program is running as
system manager (PID 1).</para></entry>
<entry>&gt; 0</entry>
</row>
<row>
<entry><varname>unknown</varname></entry>
<entry><para>The operational state could not be
determined, due to lack of resources or another
error cause.</para></entry>
<entry>&gt; 0</entry>
</row>
</tbody>
</tgroup>
</table>
</listitem>
</varlistentry>
<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 --job-mode=replace-irreversibly</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 --job-mode=replace-irreversibly</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 <optional><replaceable>arg</replaceable></optional></command></term>
<listitem>
<para>Shut down and reboot the system. This is mostly
equivalent to <command>start reboot.target --job-mode=replace-irreversibly</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>
<para>If the optional argument
<replaceable>arg</replaceable> is given, it will be passed
as the optional argument to the
<citerefentry><refentrytitle>reboot</refentrytitle><manvolnum>2</manvolnum></citerefentry>
system call. The value is architecture and firmware
specific. As an example, <literal>recovery</literal> might
be used to trigger system recovery, and
<literal>fota</literal> might be used to trigger a
<quote>firmware over the air</quote> update.</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 --job-mode=replace-irreversibly</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 <optional><replaceable>EXIT_CODE</replaceable></optional></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) or in containers
and is equivalent to <command>poweroff</command> otherwise.</para>
<para>The systemd manager can exit with a non-zero exit
code if the optional argument
<replaceable>EXIT_CODE</replaceable> is given.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>switch-root <replaceable>ROOT</replaceable> <optional><replaceable>INIT</replaceable></optional></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>
<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>
</variablelist>
</refsect2>
<refsect2>
<title>Parameter Syntax</title>
<para>Unit commands listed above take either a single unit name
(designated as <replaceable>NAME</replaceable>), or multiple
unit specifications (designated as
<replaceable>PATTERN</replaceable>...). In the first case, the
unit name with or without a suffix must be given. If the suffix
is not specified, systemctl will append a suitable suffix,
<literal>.service</literal> by default, and a type-specific
suffix in case of commands which operate only on specific unit
types. For example,
<programlisting># systemctl start sshd</programlisting> and
<programlisting># systemctl start sshd.service</programlisting>
are equivalent, as are
<programlisting># systemctl isolate default</programlisting>
and
<programlisting># systemctl isolate default.target</programlisting>
Note that (absolute) paths to device nodes are automatically
converted to device unit names, and other (absolute) paths to
mount unit names.
<programlisting># systemctl status /dev/sda
# systemctl status /home</programlisting>
are equivalent to:
<programlisting># systemctl status dev-sda.device
# systemctl status home.mount</programlisting>
In the second case, shell-style globs will be matched against
currently loaded units; literal unit names, with or without
a suffix, will be treated as in the first case. This means that
literal unit names always refer to exactly one unit, but globs
may match zero units and this is not considered an error.</para>
<para>Glob patterns use
<citerefentry project='man-pages'><refentrytitle>fnmatch</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
so normal shell-style globbing rules are used, and
<literal>*</literal>, <literal>?</literal>,
<literal>[]</literal> may be used. See
<citerefentry project='man-pages'><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>
for more details. The patterns are matched against the names of
currently loaded units, and patterns which do not match anything
are silently skipped. For example:
<programlisting># systemctl stop sshd@*.service</programlisting>
will stop all <filename>sshd@.service</filename> instances.
</para>
<para>For unit file commands, the specified
<replaceable>NAME</replaceable> should be the full name of the
unit file, or the absolute path to the unit file:
<programlisting># systemctl enable foo.service</programlisting>
or
<programlisting># systemctl link /path/to/foo.service</programlisting>
</para>
</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>$SYSTEMD_EDITOR</varname></term>
<listitem><para>Editor to use when editing units; overrides
<varname>$EDITOR</varname> and <varname>$VISUAL</varname>. If neither
<varname>$SYSTEMD_EDITOR</varname> nor <varname>$EDITOR</varname> nor
<varname>$VISUAL</varname> are present or if it is set to an empty
string or if their execution failed, systemctl will try to execute well
known editors in this order:
<citerefentry project='die-net'><refentrytitle>editor</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry project='die-net'><refentrytitle>nano</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry project='die-net'><refentrytitle>vim</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry project='die-net'><refentrytitle>vi</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para></listitem>
</varlistentry>
</variablelist>
<xi:include href="less-variables.xml" xpointer="pager"/>
<xi:include href="less-variables.xml" xpointer="less"/>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.preset</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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