Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+        "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+  SPDX-License-Identifier: LGPL-2.1+
+-->
+
+  <refentry id="journalctl"
+            xmlns:xi="http://www.w3.org/2001/XInclude">
+
+    <refentryinfo>
+      <title>journalctl</title>
+      <productname>systemd</productname>
+    </refentryinfo>
+
+    <refmeta>
+      <refentrytitle>journalctl</refentrytitle>
+      <manvolnum>1</manvolnum>
+    </refmeta>
+
+    <refnamediv>
+      <refname>journalctl</refname>
+      <refpurpose>Query the systemd journal</refpurpose>
+    </refnamediv>
+
+    <refsynopsisdiv>
+      <cmdsynopsis>
+        <command>journalctl</command>
+        <arg choice="opt" rep="repeat">OPTIONS</arg>
+        <arg choice="opt" rep="repeat">MATCHES</arg>
+      </cmdsynopsis>
+    </refsynopsisdiv>
+
+    <refsect1>
+      <title>Description</title>
+
+      <para><command>journalctl</command> may be used to query the
+      contents of the
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+      journal as written by
+      <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+
+      <para>If called without parameters, it will show the full
+      contents of the journal, starting with the oldest entry
+      collected.</para>
+
+      <para>If one or more match arguments are passed, the output is
+      filtered accordingly. A match is in the format
+      <literal>FIELD=VALUE</literal>,
+      e.g. <literal>_SYSTEMD_UNIT=httpd.service</literal>, referring
+      to the components of a structured journal entry. See
+      <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+      for a list of well-known fields. If multiple matches are
+      specified matching different fields, the log entries are
+      filtered by both, i.e. the resulting output will show only
+      entries matching all the specified matches of this kind. If two
+      matches apply to the same field, then they are automatically
+      matched as alternatives, i.e. the resulting output will show
+      entries matching any of the specified matches for the same
+      field. Finally, the character <literal>+</literal> may appear
+      as a separate word between other terms on the command line. This
+      causes all matches before and after to be combined in a
+      disjunction (i.e. logical OR).</para>
+
+      <para>It is also possible to filter the entries by specifying an
+      absolute file path as an argument. The file path may be a file or
+      a symbolic link and the file must exist at the time of the query. If a
+      file path refers to an executable binary, an <literal>_EXE=</literal>
+      match for the canonicalized binary path is added to the query. If a
+      file path refers to an executable script, a <literal>_COMM=</literal>
+      match for the script name is added to the query. If a file path
+      refers to a device node, <literal>_KERNEL_DEVICE=</literal> matches for
+      the kernel name of the device and for each of its ancestor devices is
+      added to the query. Symbolic links are dereferenced, kernel names are
+      synthesized, and parent devices are identified from the environment at
+      the time of the query. In general, a device node is the best proxy for
+      an actual device, as log entries do not usually contain fields that
+      identify an actual device. For the resulting log entries to be correct
+      for the actual device, the relevant parts of the environment at the time
+      the entry was logged, in particular the actual device corresponding to
+      the device node, must have been the same as those at the time of the
+      query. Because device nodes generally change their corresponding devices
+      across reboots, specifying a device node path causes the resulting
+      entries to be restricted to those from the current boot.</para>
+
+      <para>Additional constraints may be added using options
+      <option>--boot</option>, <option>--unit=</option>, etc., to
+      further limit what entries will be shown (logical AND).</para>
+
+      <para>Output is interleaved from all accessible journal files,
+      whether they are rotated or currently being written, and
+      regardless of whether they belong to the system itself or are
+      accessible user journals.</para>
+
+      <para>The set of journal files which will be used can be
+      modified using the <option>--user</option>,
+      <option>--system</option>, <option>--directory</option>, and
+      <option>--file</option> options, see below.</para>
+
+      <para>All users are granted access to their private per-user
+      journals. However, by default, only root and users who are
+      members of a few special groups are granted access to the system
+      journal and the journals of other users. Members of the groups
+      <literal>systemd-journal</literal>, <literal>adm</literal>, and
+      <literal>wheel</literal> can read all journal files. Note
+      that the two latter groups traditionally have additional
+      privileges specified by the distribution. Members of the
+      <literal>wheel</literal> group can often perform administrative
+      tasks.</para>
+
+      <para>The output is paged through <command>less</command> by
+      default, and long lines are "truncated" to screen width. The
+      hidden part can be viewed by using the left-arrow and
+      right-arrow keys. Paging can be disabled; see the
+      <option>--no-pager</option> option and the "Environment" section
+      below.</para>
+
+      <para>When outputting to a tty, lines are colored according to
+      priority: lines of level ERROR and higher are colored red; lines
+      of level NOTICE and higher are highlighted; lines of level DEBUG
+      are colored lighter grey; other lines are displayed normally.</para>
+    </refsect1>
+
+    <refsect1>
+      <title>Options</title>
+
+      <para>The following options are understood:</para>
+
+      <variablelist>
+        <varlistentry>
+          <term><option>--no-full</option></term>
+          <term><option>--full</option></term>
+          <term><option>-l</option></term>
+
+          <listitem><para>Ellipsize fields when they do not fit in
+          available columns.  The default is to show full fields,
+          allowing them to wrap or be truncated by the pager, if one
+          is used.</para>
+
+          <para>The old options
+          <option>-l</option>/<option>--full</option> are not useful
+          anymore, except to undo <option>--no-full</option>.</para>
+          </listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><option>-a</option></term>
+          <term><option>--all</option></term>
+
+          <listitem><para>Show all fields in full, even if they include unprintable characters or are very long. By
+          default, fields with unprintable characters are abbreviated as "blob data". (Note that the pager may escape
+          unprintable characters again.)</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><option>-f</option></term>
+          <term><option>--follow</option></term>
+
+          <listitem><para>Show only the most recent journal entries,
+          and continuously print new entries as they are appended to
+          the journal.</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><option>-e</option></term>
+          <term><option>--pager-end</option></term>
+
+          <listitem><para>Immediately jump to the end of the journal
+          inside the implied pager tool. This implies
+          <option>-n1000</option> to guarantee that the pager will not
+          buffer logs of unbounded size. This may be overridden with
+          an explicit <option>-n</option> with some other numeric
+          value, while <option>-nall</option> will disable this cap.
+          Note that this option is only supported for the
+          <citerefentry project='man-pages'><refentrytitle>less</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+          pager.</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><option>-n</option></term>
+          <term><option>--lines=</option></term>
+
+          <listitem><para>Show the most recent journal events and
+          limit the number of events shown. If
+          <option>--follow</option> is used, this option is
+          implied. The argument is a positive integer or
+          <literal>all</literal> to disable line limiting. The default
+          value is 10 if no argument is given.</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><option>--no-tail</option></term>
+
+          <listitem><para>Show all stored output lines, even in follow
+          mode. Undoes the effect of <option>--lines=</option>.
+          </para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><option>-r</option></term>
+          <term><option>--reverse</option></term>
+
+          <listitem><para>Reverse output so that the newest entries
+          are displayed first.</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><option>-o</option></term>
+          <term><option>--output=</option></term>
+
+          <listitem><para>Controls the formatting of the journal
+          entries that are shown. Takes one of the following
+          options:</para>
+          <variablelist>
+            <varlistentry>
+              <term>
+                <option>short</option>
+              </term>
+              <listitem>
+                <para>is the default and generates an output that is
+                mostly identical to the formatting of classic syslog
+                files, showing one line per journal entry.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>short-full</option>
+              </term>
+              <listitem>
+                <para>is very similar, but shows timestamps in the format the <option>--since=</option> and
+                <option>--until=</option> options accept. Unlike the timestamp information shown in
+                <option>short</option> output mode this mode includes weekday, year and timezone information in the
+                output, and is locale-independent.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>short-iso</option>
+              </term>
+              <listitem>
+                <para>is very similar, but shows ISO 8601 wallclock
+                timestamps.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>short-iso-precise</option>
+              </term>
+              <listitem>
+                <para>as for <option>short-iso</option> but includes full
+                microsecond precision.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>short-precise</option>
+              </term>
+              <listitem>
+                <para>is very similar, but shows classic syslog timestamps
+                with full microsecond precision.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>short-monotonic</option>
+              </term>
+              <listitem>
+                <para>is very similar, but shows monotonic timestamps
+                instead of wallclock timestamps.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>short-unix</option>
+              </term>
+              <listitem>
+                <para>is very similar, but shows seconds passed since January 1st 1970 UTC instead of wallclock
+                timestamps ("UNIX time"). The time is shown with microsecond accuracy.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>verbose</option>
+              </term>
+              <listitem>
+                <para>shows the full-structured entry items with all
+                fields.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>export</option>
+              </term>
+              <listitem>
+                <para>serializes the journal into a binary (but mostly
+                text-based) stream suitable for backups and network
+                transfer (see
+                <ulink url="https://www.freedesktop.org/wiki/Software/systemd/export">Journal Export Format</ulink>
+                for more information). To import the binary stream back
+                into native journald format use
+                <citerefentry><refentrytitle>systemd-journal-remote</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>json</option>
+              </term>
+              <listitem>
+                <para>formats entries as JSON objects, separated by newline characters (see <ulink
+                url="https://www.freedesktop.org/wiki/Software/systemd/json">Journal JSON Format</ulink> for more
+                information). Field values are generally encoded as JSON strings, with three exceptions:
+                <orderedlist>
+                  <listitem><para>Fields larger than 4096 bytes are encoded as <constant>null</constant> values. (This
+                  may be turned off by passing <option>--all</option>, but be aware that this may allocate overly long
+                  JSON objects.) </para></listitem>
+
+                  <listitem><para>Journal entries permit non-unique fields within the same log entry. JSON does not allow
+                  non-unique fields within objects. Due to this, if a non-unique field is encountered a JSON array is
+                  used as field value, listing all field values as elements.</para></listitem>
+
+                  <listitem><para>Fields containing non-printable or non-UTF8 bytes are encoded as arrays containing
+                  the raw bytes individually formatted as unsigned numbers.</para></listitem>
+                </orderedlist>
+
+                Note that this encoding is reversible (with the exception of the size limit).</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>json-pretty</option>
+              </term>
+              <listitem>
+                <para>formats entries as JSON data structures, but
+                formats them in multiple lines in order to make them
+                more readable by humans.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>json-sse</option>
+              </term>
+              <listitem>
+                <para>formats entries as JSON data structures, but wraps
+                them in a format suitable for
+                <ulink url="https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events">Server-Sent Events</ulink>.
+                </para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>json-seq</option>
+              </term>
+              <listitem>
+                <para>formats entries as JSON data structures, but prefixes them with an ASCII Record Separator
+                character (0x1E) and suffixes them with an ASCII Line Feed character (0x0A), in accordance with <ulink
+                url="https://tools.ietf.org/html/rfc7464">JavaScript Object Notation (JSON) Text Sequences </ulink>
+                (<literal>application/json-seq</literal>).
+                </para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>cat</option>
+              </term>
+              <listitem>
+                <para>generates a very terse output, only showing the
+                actual message of each journal entry with no metadata,
+                not even a timestamp.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
+                <option>with-unit</option>
+              </term>
+              <listitem>
+                <para>similar to short-full, but prefixes the unit and
+                user unit names instead of the traditional syslog
+                identifier. Useful when using templated instances, as it
+                will include the arguments in the unit names.</para>
+              </listitem>
+            </varlistentry>
+          </variablelist>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--output-fields=</option></term>
+
+        <listitem><para>A comma separated list of the fields which should be included in the output. This only has an
+        effect for the output modes which would normally show all fields (<option>verbose</option>,
+        <option>export</option>, <option>json</option>, <option>json-pretty</option>, <option>json-sse</option> and
+        <option>json-seq</option>). The <literal>__CURSOR</literal>, <literal>__REALTIME_TIMESTAMP</literal>,
+        <literal>__MONOTONIC_TIMESTAMP</literal>, and <literal>_BOOT_ID</literal> fields are always
+        printed.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--utc</option></term>
+
+        <listitem><para>Express time in Coordinated Universal Time
+        (UTC).</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--no-hostname</option></term>
+
+        <listitem><para>Don't show the hostname field of log messages originating from the local host. This switch only
+        has an effect on the <option>short</option> family of output modes (see above).</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-x</option></term>
+        <term><option>--catalog</option></term>
+
+        <listitem><para>Augment log lines with explanation texts from
+        the message catalog. This will add explanatory help texts to
+        log messages in the output where this is available. These
+        short help texts will explain the context of an error or log
+        event, possible solutions, as well as pointers to support
+        forums, developer documentation, and any other relevant
+        manuals. Note that help texts are not available for all
+        messages, but only for selected ones. For more information on
+        the message catalog, please refer to the
+        <ulink url="https://www.freedesktop.org/wiki/Software/systemd/catalog">Message Catalog Developer Documentation</ulink>.</para>
+
+        <para>Note: when attaching <command>journalctl</command>
+        output to bug reports, please do <emphasis>not</emphasis> use
+        <option>-x</option>.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-q</option></term>
+        <term><option>--quiet</option></term>
+
+        <listitem><para>Suppresses all informational messages
+        (i.e. "-- Logs begin at …", "-- Reboot --"),
+        any warning messages regarding
+        inaccessible system journals when run as a normal
+        user.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-m</option></term>
+        <term><option>--merge</option></term>
+
+        <listitem><para>Show entries interleaved from all available
+        journals, including remote ones.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-b <optional><replaceable>ID</replaceable></optional><optional><replaceable>±offset</replaceable></optional></option></term>
+        <term><option>--boot=<optional><replaceable>ID</replaceable></optional><optional><replaceable>±offset</replaceable></optional></option></term>
+
+        <listitem><para>Show messages from a specific boot. This will
+        add a match for <literal>_BOOT_ID=</literal>.</para>
+
+        <para>The argument may be empty, in which case logs for the
+        current boot will be shown.</para>
+
+        <para>If the boot ID is omitted, a positive
+        <replaceable>offset</replaceable> will look up the boots
+        starting from the beginning of the journal, and an
+        equal-or-less-than zero <replaceable>offset</replaceable> will
+        look up boots starting from the end of the journal. Thus,
+        <constant>1</constant> means the first boot found in the
+        journal in chronological order, <constant>2</constant> the
+        second and so on; while <constant>-0</constant> is the last
+        boot, <constant>-1</constant> the boot before last, and so
+        on. An empty <replaceable>offset</replaceable> is equivalent
+        to specifying <constant>-0</constant>, except when the current
+        boot is not the last boot (e.g. because
+        <option>--directory</option> was specified to look at logs
+        from a different machine).</para>
+
+        <para>If the 32-character <replaceable>ID</replaceable> is
+        specified, it may optionally be followed by
+        <replaceable>offset</replaceable> which identifies the boot
+        relative to the one given by boot
+        <replaceable>ID</replaceable>. Negative values mean earlier
+        boots and positive values mean later boots. If
+        <replaceable>offset</replaceable> is not specified, a value of
+        zero is assumed, and the logs for the boot given by
+        <replaceable>ID</replaceable> are shown.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--list-boots</option></term>
+
+        <listitem><para>Show a tabular list of boot numbers (relative to
+        the current boot), their IDs, and the timestamps of the first
+        and last message pertaining to the boot.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-k</option></term>
+        <term><option>--dmesg</option></term>
+
+        <listitem><para>Show only kernel messages. This implies
+        <option>-b</option> and adds the match
+        <literal>_TRANSPORT=kernel</literal>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-t</option></term>
+        <term><option>--identifier=<replaceable>SYSLOG_IDENTIFIER</replaceable></option></term>
+
+        <listitem><para>Show messages for the specified syslog
+        identifier
+        <replaceable>SYSLOG_IDENTIFIER</replaceable>.</para>
+
+        <para>This parameter can be specified multiple
+        times.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-u</option></term>
+        <term><option>--unit=<replaceable>UNIT</replaceable>|<replaceable>PATTERN</replaceable></option></term>
+
+        <listitem><para>Show messages for the specified systemd unit
+        <replaceable>UNIT</replaceable> (such as a service unit), or
+        for any of the units matched by
+        <replaceable>PATTERN</replaceable>.  If a pattern is
+        specified, a list of unit names found in the journal is
+        compared with the specified pattern and all that match are
+        used. For each unit name, a match is added for messages from
+        the unit
+        (<literal>_SYSTEMD_UNIT=<replaceable>UNIT</replaceable></literal>),
+        along with additional matches for messages from systemd and
+        messages about coredumps for the specified unit.</para>
+
+        <para>This parameter can be specified multiple times.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--user-unit=</option></term>
+
+        <listitem><para>Show messages for the specified user session
+        unit. This will add a match for messages from the unit
+        (<literal>_SYSTEMD_USER_UNIT=</literal> and
+        <literal>_UID=</literal>) and additional matches for messages
+        from session systemd and messages about coredumps for the
+        specified unit.</para>
+
+        <para>This parameter can be specified multiple times.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-p</option></term>
+        <term><option>--priority=</option></term>
+
+        <listitem><para>Filter output by message priorities or
+        priority ranges. Takes either a single numeric or textual log
+        level (i.e. between 0/<literal>emerg</literal> and
+        7/<literal>debug</literal>), or a range of numeric/text log
+        levels in the form FROM..TO. The log levels are the usual
+        syslog log levels as documented in
+        <citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+        i.e. <literal>emerg</literal> (0),
+        <literal>alert</literal> (1), <literal>crit</literal> (2),
+        <literal>err</literal> (3), <literal>warning</literal> (4),
+        <literal>notice</literal> (5), <literal>info</literal> (6),
+        <literal>debug</literal> (7). If a single log level is
+        specified, all messages with this log level or a lower (hence
+        more important) log level are shown. If a range is specified,
+        all messages within the range are shown, including both the
+        start and the end value of the range. This will add
+        <literal>PRIORITY=</literal> matches for the specified
+        priorities.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-g</option></term>
+        <term><option>--grep=</option></term>
+
+        <listitem><para>Filter output to entries where the <varname>MESSAGE=</varname>
+        field matches the specified regular expression. PERL-compatible regular expressions
+        are used, see
+        <citerefentry><refentrytitle>pcre2pattern</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+        for a detailed description of the syntax.</para>
+
+        <para>If the pattern is all lowercase, matching is case insensitive.
+        Otherwise, matching is case sensitive. This can be overridden with the
+        <option>--case-sensitive</option> option, see below.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--case-sensitive<optional>=BOOLEAN</optional></option></term>
+
+        <listitem><para>Make pattern matching case sensitive or case insenstive.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-c</option></term>
+        <term><option>--cursor=</option></term>
+
+        <listitem><para>Start showing entries from the location in the
+        journal specified by the passed cursor.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--after-cursor=</option></term>
+
+        <listitem><para>Start showing entries from the location in the
+        journal <emphasis>after</emphasis> the location specified by
+        the passed cursor.  The cursor is shown when the
+        <option>--show-cursor</option> option is used.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--show-cursor</option></term>
+
+        <listitem><para>The cursor is shown after the last entry after
+        two dashes:</para>
+        <programlisting>-- cursor: s=0639…</programlisting>
+        <para>The format of the cursor is private
+        and subject to change.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-S</option></term>
+        <term><option>--since=</option></term>
+        <term><option>-U</option></term>
+        <term><option>--until=</option></term>
+
+        <listitem><para>Start showing entries on or newer than the specified date, or on or older than the specified
+        date, respectively. Date specifications should be of the format <literal>2012-10-30 18:17:16</literal>.  If the
+        time part is omitted, <literal>00:00:00</literal> is assumed.  If only the seconds component is omitted,
+        <literal>:00</literal> is assumed. If the date component is omitted, the current day is assumed. Alternatively
+        the strings <literal>yesterday</literal>, <literal>today</literal>, <literal>tomorrow</literal> are understood,
+        which refer to 00:00:00 of the day before the current day, the current day, or the day after the current day,
+        respectively. <literal>now</literal> refers to the current time. Finally, relative times may be specified,
+        prefixed with <literal>-</literal> or <literal>+</literal>, referring to times before or after the current
+        time, respectively. For complete time and date specification, see
+        <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>. Note that
+        <option>--output=short-full</option> prints timestamps that follow precisely this format.
+        </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-F</option></term>
+        <term><option>--field=</option></term>
+
+        <listitem><para>Print all possible data values the specified
+        field can take in all entries of the journal.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-N</option></term>
+        <term><option>--fields</option></term>
+
+        <listitem><para>Print all field names currently used in all entries of the journal.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--system</option></term>
+        <term><option>--user</option></term>
+
+        <listitem><para>Show messages from system services and the
+        kernel (with <option>--system</option>). Show messages from
+        service of current user (with <option>--user</option>).  If
+        neither is specified, show all messages that the user can see.
+        </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-M</option></term>
+        <term><option>--machine=</option></term>
+
+        <listitem><para>Show messages from a running, local
+        container. Specify a container name to connect to.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-D <replaceable>DIR</replaceable></option></term>
+        <term><option>--directory=<replaceable>DIR</replaceable></option></term>
+
+        <listitem><para>Takes a directory path as argument. If
+        specified, journalctl will operate on the specified journal
+        directory <replaceable>DIR</replaceable> instead of the
+        default runtime and system journal paths.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--file=<replaceable>GLOB</replaceable></option></term>
+
+        <listitem><para>Takes a file glob as an argument. If
+        specified, journalctl will operate on the specified journal
+        files matching <replaceable>GLOB</replaceable> instead of the
+        default runtime and system journal paths. May be specified
+        multiple times, in which case files will be suitably
+        interleaved.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--root=<replaceable>ROOT</replaceable></option></term>
+
+        <listitem><para>Takes a directory path as an argument. If
+        specified, journalctl will operate on journal directories and catalog file hierarchy
+        underneath the specified directory instead of the root
+        directory (e.g. <option>--update-catalog</option> will create
+        <filename><replaceable>ROOT</replaceable>/var/lib/systemd/catalog/database</filename>,
+        and journal files under <filename><replaceable>ROOT</replaceable>/run/journal</filename>
+        or <filename><replaceable>ROOT</replaceable>/var/log/journal</filename> will be displayed).
+        </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--header</option></term>
+
+        <listitem><para>Instead of showing journal contents, show
+        internal header information of the journal fields
+        accessed.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--disk-usage</option></term>
+
+        <listitem><para>Shows the current disk usage of all journal
+        files. This shows the sum of the disk usage of all archived
+        and active journal files.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--vacuum-size=</option></term>
+        <term><option>--vacuum-time=</option></term>
+        <term><option>--vacuum-files=</option></term>
+
+        <listitem><para>Removes the oldest archived journal files until the disk space they use falls below the
+        specified size (specified with the usual <literal>K</literal>, <literal>M</literal>, <literal>G</literal> and
+        <literal>T</literal> suffixes), or all archived journal files contain no data older than the specified timespan
+        (specified with the usual <literal>s</literal>, <literal>m</literal>, <literal>h</literal>,
+        <literal>days</literal>, <literal>months</literal>, <literal>weeks</literal> and <literal>years</literal>
+        suffixes), or no more than the specified number of separate journal files remain. Note that running
+        <option>--vacuum-size=</option> has only an indirect effect on the output shown by
+        <option>--disk-usage</option>, as the latter includes active journal files, while the vacuuming operation only
+        operates on archived journal files. Similarly, <option>--vacuum-files=</option> might not actually reduce the
+        number of journal files to below the specified number, as it will not remove active journal
+        files.</para>
+
+        <para><option>--vacuum-size=</option>, <option>--vacuum-time=</option> and <option>--vacuum-files=</option>
+        may be combined in a single invocation to enforce any combination of a size, a time and a number of files limit
+        on the archived journal files. Specifying any of these three parameters as zero is equivalent to not enforcing
+        the specific limit, and is thus redundant.</para>
+
+        <para>These three switches may also be combined with <option>--rotate</option> into one command. If so, all
+        active files are rotated first, and the requested vacuuming operation is executed right after. The rotation has
+        the effect that all currently active files are archived (and potentially new, empty journal files opened as
+        replacement), and hence the vacuuming operation has the greatest effect as it can take all log data written so
+        far into account.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--list-catalog
+        <optional><replaceable>128-bit-ID…</replaceable></optional>
+        </option></term>
+
+        <listitem><para>List the contents of the message catalog as a
+        table of message IDs, plus their short description strings.
+        </para>
+
+        <para>If any <replaceable>128-bit-ID</replaceable>s are
+        specified, only those entries are shown.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--dump-catalog
+        <optional><replaceable>128-bit-ID…</replaceable></optional>
+        </option></term>
+
+        <listitem><para>Show the contents of the message catalog, with
+        entries separated by a line consisting of two dashes and the
+        ID (the format is the same as <filename>.catalog</filename>
+        files).</para>
+
+        <para>If any <replaceable>128-bit-ID</replaceable>s are
+        specified, only those entries are shown.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--update-catalog</option></term>
+
+        <listitem><para>Update the message catalog index. This command
+        needs to be executed each time new catalog files are
+        installed, removed, or updated to rebuild the binary catalog
+        index.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--setup-keys</option></term>
+
+        <listitem><para>Instead of showing journal contents, generate
+        a new key pair for Forward Secure Sealing (FSS). This will
+        generate a sealing key and a verification key. The sealing key
+        is stored in the journal data directory and shall remain on
+        the host. The verification key should be stored
+        externally. Refer to the <option>Seal=</option> option in
+        <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+        for information on Forward Secure Sealing and for a link to a
+        refereed scholarly paper detailing the cryptographic theory it
+        is based on.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--force</option></term>
+
+        <listitem><para>When <option>--setup-keys</option> is passed
+        and Forward Secure Sealing (FSS) has already been configured,
+        recreate FSS keys.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--interval=</option></term>
+
+        <listitem><para>Specifies the change interval for the sealing
+        key when generating an FSS key pair with
+        <option>--setup-keys</option>. Shorter intervals increase CPU
+        consumption but shorten the time range of undetectable journal
+        alterations. Defaults to 15min.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--verify</option></term>
+
+        <listitem><para>Check the journal file for internal
+        consistency. If the file has been generated with FSS enabled and
+        the FSS verification key has been specified with
+        <option>--verify-key=</option>, authenticity of the journal file
+        is verified.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--verify-key=</option></term>
+
+        <listitem><para>Specifies the FSS verification key to use for
+        the <option>--verify</option> operation.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--sync</option></term>
+
+        <listitem><para>Asks the journal daemon to write all yet
+        unwritten journal data to the backing file system and
+        synchronize all journals. This call does not return until the
+        synchronization operation is complete. This command guarantees
+        that any log messages written before its invocation are safely
+        stored on disk at the time it returns.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--flush</option></term>
+
+        <listitem><para>Asks the journal daemon to flush any log data
+        stored in <filename>/run/log/journal</filename> into
+        <filename>/var/log/journal</filename>, if persistent storage
+        is enabled. This call does not return until the operation is
+        complete. Note that this call is idempotent: the data is only
+        flushed from <filename>/run/log/journal</filename> into
+        <filename>/var/log/journal</filename> once during system
+        runtime, and this command exits cleanly without executing any
+        operation if this has already happened. This command
+        effectively guarantees that all data is flushed to
+        <filename>/var/log/journal</filename> at the time it
+        returns.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--rotate</option></term>
+
+        <listitem><para>Asks the journal daemon to rotate journal files. This call does not return until the rotation
+        operation is complete. Journal file rotation has the effect that all currently active journal files are marked
+        as archived and renamed, so that they are never written to in future. New (empty) journal files are then
+        created in their place. This operation may be combined with <option>--vacuum-size=</option>,
+        <option>--vacuum-time=</option> and <option>--vacuum-file=</option> into a single command, see
+        above.</para></listitem>
+      </varlistentry>
+
+      <xi:include href="standard-options.xml" xpointer="help" />
+      <xi:include href="standard-options.xml" xpointer="version" />
+      <xi:include href="standard-options.xml" xpointer="no-pager" />
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Exit status</title>
+
+    <para>On success, 0 is returned; otherwise, a non-zero failure
+    code is returned.</para>
+  </refsect1>
+
+  <xi:include href="less-variables.xml" />
+
+  <refsect1>
+    <title>Examples</title>
+
+    <para>Without arguments, all collected logs are shown
+    unfiltered:</para>
+
+    <programlisting>journalctl</programlisting>
+
+    <para>With one match specified, all entries with a field matching
+    the expression are shown:</para>
+
+    <programlisting>journalctl _SYSTEMD_UNIT=avahi-daemon.service
+journalctl _SYSTEMD_CGROUP=/user.slice/user-42.slice/session-c1.scope</programlisting>
+
+    <para>If two different fields are matched, only entries matching
+    both expressions at the same time are shown:</para>
+
+    <programlisting>journalctl _SYSTEMD_UNIT=avahi-daemon.service _PID=28097</programlisting>
+
+    <para>If two matches refer to the same field, all entries matching
+    either expression are shown:</para>
+
+    <programlisting>journalctl _SYSTEMD_UNIT=avahi-daemon.service _SYSTEMD_UNIT=dbus.service</programlisting>
+
+    <para>If the separator <literal>+</literal> is used, two
+    expressions may be combined in a logical OR. The following will
+    show all messages from the Avahi service process with the PID
+    28097 plus all messages from the D-Bus service (from any of its
+    processes):</para>
+
+    <programlisting>journalctl _SYSTEMD_UNIT=avahi-daemon.service _PID=28097 + _SYSTEMD_UNIT=dbus.service</programlisting>
+
+    <para>To show all fields emitted <emphasis>by</emphasis> a unit and <emphasis>about</emphasis>
+    the unit, option <option>-u</option>/<option>--unit=</option> should be used.
+    <command>journalctl -u <replaceable>name</replaceable></command>
+    expands to a complex filter similar to
+    <programlisting>_SYSTEMD_UNIT=<replaceable>name</replaceable>.service
+  + UNIT=<replaceable>name</replaceable>.service _PID=1
+  + OBJECT_SYSTEMD_UNIT=<replaceable>name</replaceable>.service _UID=0
+  + COREDUMP_UNIT=<replaceable>name</replaceable>.service _UID=0 MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1
+    </programlisting>
+    (see <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+    for an explanation of those patterns).
+    </para>
+
+    <para>Show all logs generated by the D-Bus executable:</para>
+
+    <programlisting>journalctl /usr/bin/dbus-daemon</programlisting>
+
+    <para>Show all kernel logs from previous boot:</para>
+
+    <programlisting>journalctl -k -b -1</programlisting>
+
+    <para>Show a live log display from a system service
+    <filename>apache.service</filename>:</para>
+
+    <programlisting>journalctl -f -u apache</programlisting>
+
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-journal-remote.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-journal-upload.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+</refentry>