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294 lines
13 KiB
XML
294 lines
13 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 2012 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="timedatectl">
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<refentryinfo>
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<title>timedatectl</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>timedatectl</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>timedatectl</refname>
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<refpurpose>Control the system time and date</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>timedatectl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg></command>
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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>timedatectl</command> may be used to
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query and change the system clock and its
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settings.</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>--help</option></term>
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<term><option>-h</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><para>Prints a short version
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string and exits.</para></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><para>Do not pipe output into a
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pager.</para></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><para>Don't query the user
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for authentication for privileged
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operations.</para></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><para>Execute the operation
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remotely. Specify a hostname, or
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username and hostname separated by @,
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to connect to. This will use SSH to
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talk to a remote
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system.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--adjust-system-clock</option></term>
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<listitem><para>If
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<command>set-local-rtc</command> is
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invoked and this option is passed the
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system clock is synchronized from the
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RTC again, taking the new setting into
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account. Otherwise the RTC is
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synchronized from the system
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clock.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>The following commands are understood:</para>
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<variablelist>
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<varlistentry>
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<term><command>status</command></term>
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<listitem><para>Show current settings
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of the system clock and
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RTC.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-time [TIME]</command></term>
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<listitem><para>Set the system clock
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to the specified time. This will also
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update the RTC time accordingly. The time
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may be specified in the format
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"2012-10-30
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18:17:16".</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-timezone [TIMEZONE]</command></term>
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<listitem><para>Set the system time
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zone to the specified value. Available
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time zones can be listed with
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<command>list-timezones</command>. If
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the RTC is configured to be in the
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local time this will also update the
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RTC time. This call will alter the
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<filename>/etc/localtime</filename>
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symlink. See
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<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more
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information.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>list-timezones</command></term>
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<listitem><para>List available time
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zones, one per line. Entries from the
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list can be set as the system
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time zone with
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<command>set-timezone</command>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-local-rtc [BOOL]</command></term>
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<listitem><para>Takes a boolean
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argument. If <literal>0</literal> the
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system is configured to maintain the
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RTC in universal time, if
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<literal>1</literal> it will maintain
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the RTC in local time instead. Note
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that maintaining the RTC in the local
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time zone is not fully supported and
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will create various problems with time
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zone changes and daylight saving
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adjustments. If at all possible use
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RTC in UTC. Note that invoking this
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will also synchronize the RTC from the
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system clock, unless
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<option>--adjust-system-clock</option> is
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passed (see above). This command will
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change the 3rd line of
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<filename>/etc/adjtime</filename>, as
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documented in
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<citerefentry><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-ntp [BOOL]</command></term>
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<listitem><para>Takes a boolean
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argument. Controls whether NTP based
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network time synchronization is
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enabled (if
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available).</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<variablelist>
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<varlistentry>
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<term><varname>$SYSTEMD_PAGER</varname></term>
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<listitem><para>Pager to use when
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<option>--no-pager</option> is not given;
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overrides <varname>$PAGER</varname>. Setting
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this to an empty string or the value
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<literal>cat</literal> is equivalent to passing
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<option>--no-pager</option>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>Show current settings:
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<programlisting>
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$ timedatectl
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Local time: Fri, 2012-11-02 09:26:46 CET
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Universal time: Fri, 2012-11-02 08:26:46 UTC
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RTC time: Fri, 2012-11-02 08:26:45
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Timezone: Europe/Warsaw
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UTC offset: +0100
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NTP enabled: no
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NTP synchronized: no
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RTC in local TZ: no
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DST active: no
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Last DST change: CEST → CET, DST became inactive
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Sun, 2012-10-28 02:59:59 CEST
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Sun, 2012-10-28 02:00:00 CET
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Next DST change: CET → CEST, DST will become active
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the clock will jump one hour forward
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Sun, 2013-03-31 01:59:59 CET
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Sun, 2013-03-31 03:00:00 CEST
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</programlisting>
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</para>
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<para>Enable an NTP daemon (chronyd):
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<programlisting>
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$ timedatectl set-ntp true
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==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
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Authentication is required to control whether network time synchronization shall be enabled.
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Authenticating as: user
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Password: ********
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==== AUTHENTICATION COMPLETE ===
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</programlisting>
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<programlisting>
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$ systemctl status chronyd.service
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chronyd.service - NTP client/server
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Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled)
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Active: active (running) since Fri, 2012-11-02 09:36:25 CET; 5s ago
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...
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>date</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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