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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">
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This file is part of systemd.
Copyright 2012 Lennart Poettering
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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systemd is distributed in the hope that it will be useful, but
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<refentry id= "journalctl" >
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<refentryinfo >
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<title > journalctl</title>
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<productname > systemd</productname>
<authorgroup >
<author >
<contrib > Developer</contrib>
<firstname > Lennart</firstname>
<surname > Poettering</surname>
<email > lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta >
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<refentrytitle > journalctl</refentrytitle>
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<manvolnum > 1</manvolnum>
</refmeta>
<refnamediv >
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<refname > journalctl</refname>
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<refpurpose > Query the systemd journal</refpurpose>
</refnamediv>
<refsynopsisdiv >
<cmdsynopsis >
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<command > journalctl</command>
<arg choice= "opt" rep= "repeat" > OPTIONS</arg>
<arg choice= "opt" rep= "repeat" > MATCHES</arg>
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</cmdsynopsis>
</refsynopsisdiv>
<refsect1 >
<title > Description</title>
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<para > <command > journalctl</command> may be used to
query the contents of the
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<citerefentry > <refentrytitle > systemd</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry>
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journal as written by
<citerefentry > <refentrytitle > systemd-journald.service</refentrytitle> <manvolnum > 8</manvolnum> </citerefentry> .</para>
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<para > If called without parameters, it will show the full
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contents of the journal, starting with the oldest
entry collected.</para>
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<para > If one or more match arguments are passed, the
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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
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<citerefentry > <refentrytitle > systemd.journal-fields</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry>
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for a list of well-known fields. If multiple matches
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are specified matching different fields, the log
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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, if the character
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<literal > +</literal> appears as separate word on the
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command line, all matches before and after are combined
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in a disjunction (i.e. logical OR).</para>
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<para > As shortcuts for a few types of field/value
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matches, file paths may be specified. If a file path
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refers to an executable file, this is equivalent to an
<literal > _EXE=</literal> match for the canonicalized
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binary path. Similarly, if a path refers to a device
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node, this is equivalent to a
<literal > _KERNEL_DEVICE=</literal> match for the
device.</para>
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<para > Output is interleaved from all accessible
journal files, whether they are rotated or currently
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being written, and regardless of whether they belong to the
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system itself or are accessible user journals.</para>
<para > All users are granted access to their private
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per-user journals. However, by default, only root and
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users who are members of the <literal > adm</literal>
group get access to the system journal and the
journals of other users.</para>
</refsect1>
<refsect1 >
<title > Options</title>
<para > The following options are understood:</para>
<variablelist >
<varlistentry >
<term > <option > -h</option> </term>
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<term > <option > --help</option> </term>
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<listitem > <para > Prints a short help
text and exits.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <option > --version</option> </term>
<listitem > <para > Prints a short version
string and exits.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <option > --no-pager</option> </term>
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<listitem > <para > Do not pipe output into a
pager.</para> </listitem>
</varlistentry>
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<varlistentry >
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<term > <option > -l</option> </term>
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<term > <option > --full</option> </term>
<listitem > <para > Show all (printable) fields in
full.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <option > -a</option> </term>
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<term > <option > --all</option> </term>
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<listitem > <para > Show all fields in
full, even if they include unprintable
characters or are very
long.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <option > -f</option> </term>
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<term > <option > --follow</option> </term>
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<listitem > <para > Show only the most recent
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journal entries, and continuously print
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new entries as they are appended to
the journal.</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <option > -e</option> </term>
<term > <option > --pager-end</option> </term>
<listitem > <para > Immediately jump to
the end of the journal inside the
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implied pager tool. This implies
<option > -n1000</option> to guarantee
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that the pager will not buffer logs of
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unbounded size. This may be overridden
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with an explicit <option > -n</option>
with some other numeric value on the
command line. Note that this option is
only supported for the
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<citerefentry > <refentrytitle > less</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry>
pager.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <option > -n</option> </term>
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<term > <option > --lines=</option> </term>
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<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,
a positive integer, is optional, and
defaults to 10. </para> </listitem>
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</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>
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<varlistentry >
<term > <option > -r</option> </term>
<term > <option > --reverse</option> </term>
<listitem > <para > Reverse output, so the newest
entries are displayed first.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <option > -o</option> </term>
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<term > <option > --output=</option> </term>
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<listitem > <para > Controls the
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formatting of the journal entries that
are shown. Takes one of
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<literal > short</literal> ,
<literal > short-monotonic</literal> ,
<literal > verbose</literal> ,
<literal > export</literal> ,
<literal > json</literal> ,
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<literal > json-pretty</literal> ,
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<literal > json-sse</literal> ,
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<literal > cat</literal> . <literal > short</literal>
is the default and generates an output
that is mostly identical to the
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formatting of classic syslog
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files, showing one line per journal
entry. <literal > short-monotonic</literal>
is very similar but shows monotonic
timestamps instead of wallclock
timestamps. <literal > verbose</literal>
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shows the full structured entry items
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with all
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fields. <literal > export</literal>
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serializes the journal into a binary
(but mostly text-based) stream
suitable for backups and network
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transfer (see <ulink
url="http://www.freedesktop.org/wiki/Software/systemd/export">Journal
Export Format</ulink> for more
information). <literal > json</literal>
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formats entries as JSON data
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structures, one per
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line (see <ulink
url="http://www.freedesktop.org/wiki/Software/systemd/json">Journal
JSON Format</ulink> for more
information). <literal > json-pretty</literal>
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also formats entries as JSON data
structures, but formats them in
multiple lines in order to make them
more readable for
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humans. <literal > json-sse</literal>
also 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> . <literal > cat</literal>
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generates a very terse output only
showing the actual message of each
journal entry with no meta data, not
even a timestamp.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <option > -x</option> </term>
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<term > <option > --catalog</option> </term>
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<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
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available for all messages, but only
for selected ones. For more
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information on the message catalog,
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please refer to the <ulink
url="http://www.freedesktop.org/wiki/Software/systemd/catalog">Message
Catalog Developer
Documentation</ulink> .</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <option > -q</option> </term>
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<term > <option > --quiet</option> </term>
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<listitem > <para > Suppresses any warning
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message regarding inaccessible system
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journals when run as normal
user.</para> </listitem>
</varlistentry>
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<varlistentry >
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<term > <option > -m</option> </term>
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<term > <option > --merge</option> </term>
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<listitem > <para > Show entries
interleaved from all available
journals, including remote
ones.</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <option > -b</option> </term>
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<term > <option > --this-boot</option> </term>
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<listitem > <para > Show data only from
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current boot. This will add a match
for <literal > _BOOT_ID=</literal> for
the current boot ID of the
kernel.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <option > -k</option> </term>
<term > <option > --dmesg</option> </term>
<listitem > <para > Show kernel messages from
current boot. This implies <option > -b</option>
and adds the match <literal > _TRANSPORT=kernel</literal> .
</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <option > -u</option> </term>
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<term > <option > --unit=</option> </term>
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<listitem > <para > Show messages for the
specified systemd unit. This will add
a match for messages from the unit
(<literal > _SYSTEMD_UNIT=</literal> )
and additional matches for messages
from systemd and messages about
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coredumps for the specified unit.</para>
<para > This parameter can be specified multiple times.
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</para> </listitem>
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</varlistentry>
<varlistentry >
<term > <option > --user-unit=</option> </term>
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<listitem > <para > Show messages for the
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specified user session unit. This will
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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
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coredumps for the specified unit.</para>
<para > This parameter can be specified multiple times.
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</para> </listitem>
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</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 > <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
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single log level is specified, all
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messages with this log level or a
lower (hence more important) log level
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are shown. If a range is specified, all
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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>
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</varlistentry>
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<varlistentry >
<term > <option > -c</option> </term>
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<term > <option > --cursor=</option> </term>
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<listitem > <para > Start showing entries
from the location in the journal
specified by the passed
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cursor.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <option > --since=</option> </term>
<term > <option > --until=</option> </term>
<listitem > <para > Start showing entries
Reword sentences that contain psuedo-English "resp."
As you likely know, Arch Linux is in the process of moving to systemd.
So I was reading through the various systemd docs and quickly became
baffled by this new abbreviation "resp.", which I've never seen before
in my English-mother-tongue life.
Some quick Googling turned up a reference:
<http://www.transblawg.eu/index.php?/archives/870-Resp.-and-other-non-existent-English-wordsNicht-existente-englische-Woerter.html>
I guess it's a literal translation of the German "Beziehungsweise", but
English doesn't work the same way. The word "respectively" is used
exclusively to provide an ordering connection between two lists. E.g.
"the prefixes k, M, and G refer to kilo-, mega-, and giga-,
respectively." It is also never abbreviated to "resp." So the sentence
"Sets the default output resp. error output for all services and
sockets" makes no sense to a natural English speaker.
This patch removes all instances of "resp." in the man pages and
replaces them with sentences which are much more clear and, hopefully,
grammatically valid. In almost all instances, it was simply replacing
"resp." with "or," which the original author (Lennart?) could probably
just do in the future.
The only other instances of "resp." are in the src/ subtree, which I
don't feel privileged to correct.
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
2012-10-15 13:59:12 -05:00
on or newer than the specified date,
or on or older than the specified
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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
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<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
Reword sentences that contain psuedo-English "resp."
As you likely know, Arch Linux is in the process of moving to systemd.
So I was reading through the various systemd docs and quickly became
baffled by this new abbreviation "resp.", which I've never seen before
in my English-mother-tongue life.
Some quick Googling turned up a reference:
<http://www.transblawg.eu/index.php?/archives/870-Resp.-and-other-non-existent-English-wordsNicht-existente-englische-Woerter.html>
I guess it's a literal translation of the German "Beziehungsweise", but
English doesn't work the same way. The word "respectively" is used
exclusively to provide an ordering connection between two lists. E.g.
"the prefixes k, M, and G refer to kilo-, mega-, and giga-,
respectively." It is also never abbreviated to "resp." So the sentence
"Sets the default output resp. error output for all services and
sockets" makes no sense to a natural English speaker.
This patch removes all instances of "resp." in the man pages and
replaces them with sentences which are much more clear and, hopefully,
grammatically valid. In almost all instances, it was simply replacing
"resp." with "or," which the original author (Lennart?) could probably
just do in the future.
The only other instances of "resp." are in the src/ subtree, which I
don't feel privileged to correct.
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
2012-10-15 13:59:12 -05:00
current day, or the day after the
current day, respectively. <literal > now</literal>
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refers to the current time. Finally,
relative times may be specified,
prefixed with <literal > -</literal> or
<literal > +</literal> , referring to
Reword sentences that contain psuedo-English "resp."
As you likely know, Arch Linux is in the process of moving to systemd.
So I was reading through the various systemd docs and quickly became
baffled by this new abbreviation "resp.", which I've never seen before
in my English-mother-tongue life.
Some quick Googling turned up a reference:
<http://www.transblawg.eu/index.php?/archives/870-Resp.-and-other-non-existent-English-wordsNicht-existente-englische-Woerter.html>
I guess it's a literal translation of the German "Beziehungsweise", but
English doesn't work the same way. The word "respectively" is used
exclusively to provide an ordering connection between two lists. E.g.
"the prefixes k, M, and G refer to kilo-, mega-, and giga-,
respectively." It is also never abbreviated to "resp." So the sentence
"Sets the default output resp. error output for all services and
sockets" makes no sense to a natural English speaker.
This patch removes all instances of "resp." in the man pages and
replaces them with sentences which are much more clear and, hopefully,
grammatically valid. In almost all instances, it was simply replacing
"resp." with "or," which the original author (Lennart?) could probably
just do in the future.
The only other instances of "resp." are in the src/ subtree, which I
don't feel privileged to correct.
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
2012-10-15 13:59:12 -05:00
times before or after the current
time, respectively.</para> </listitem>
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</varlistentry>
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<varlistentry >
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<term > <option > -F</option> </term>
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<term > <option > --field=</option> </term>
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<listitem > <para > Print all possible
data values the specified field can
take in all entries of the
journal.</para> </listitem>
</varlistentry>
2013-06-04 19:33:34 -04:00
<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>
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<varlistentry >
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<term > <option > -D <replaceable > DIR</replaceable> </option> </term>
<term > <option > --directory=<replaceable > DIR</replaceable> </option> </term>
<listitem > <para > Takes a directory path
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as argument. If specified, journalctl
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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
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argument. If specified, journalctl will
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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>
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</varlistentry>
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<varlistentry >
<term > <option > --root=<replaceable > ROOT</replaceable> </option> </term>
<listitem > <para > Takes a directory path
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as argument. If specified, journalctl
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will operate on 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> ).
</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <option > --new-id128</option> </term>
<listitem > <para > Instead of showing
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journal contents, generate a new 128
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bit ID suitable for identifying
messages. This is intended for usage
by developers who need a new
identifier for a new message they
introduce and want to make
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recognizable. This will print the new ID in
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three different formats which can be
copied into source code or
similar.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <option > --header</option> </term>
<listitem > <para > Instead of showing
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journal contents, show internal header
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information of the journal fields
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accessed.</para> </listitem>
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</varlistentry>
<varlistentry >
<term > <option > --disk-usage</option> </term>
<listitem > <para > Shows the current disk
usage of all
journal files.</para> </listitem>
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</varlistentry>
<varlistentry >
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<term > <option > --list-catalog
<optional > <replaceable > ID128...</replaceable> </optional>
</option> </term>
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<listitem > <para > List the contents of
the message catalog, as table of
message IDs plus their short
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description strings.</para>
<para > If any
<replaceable > ID128</replaceable> s are
specified, only those entries are shown.
</para>
</listitem>
</varlistentry>
<varlistentry >
<term > <option > --dump-catalog
<optional > <replaceable > ID128...</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 > ID128</replaceable> s are
specified, only those entries are shown.
</para>
</listitem>
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</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>
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</varlistentry>
<varlistentry >
<term > <option > --setup-keys</option> </term>
<listitem > <para > Instead of showing
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journal contents, generate a new key
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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
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stored externally. Also see the
<option > Seal=</option> option in
<citerefentry > <refentrytitle > journald.conf</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
for details.</para> </listitem>
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</varlistentry>
<varlistentry >
<term > <option > --interval=</option> </term>
<listitem > <para > Specifies the change
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interval for the sealing key when
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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
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enabled and the FSS verification key
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has been specified with
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<option > --verify-key=</option> ,
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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>
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</variablelist>
</refsect1>
<refsect1 >
<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>
</refsect1>
<refsect1 >
<title > Environment</title>
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<variablelist class= 'environment-variables' >
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<varlistentry >
<term > <varname > $SYSTEMD_PAGER</varname> </term>
<listitem > <para > Pager to use when
<option > --no-pager</option> is not given;
overrides <varname > $PAGER</varname> . Setting
this to an empty string or the value
<literal > cat</literal> is equivalent to passing
<option > --no-pager</option> .</para> </listitem>
</varlistentry>
</variablelist>
</refsect1>
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<refsect1 >
<title > Examples</title>
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<para > Without arguments, all collected logs are shown
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unfiltered:</para>
<programlisting > journalctl</programlisting>
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<para > With one match specified, all entries with a field matching the expression are shown:</para>
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<programlisting > journalctl _SYSTEMD_UNIT=avahi-daemon.service</programlisting>
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<para > If two different fields are matched, only entries matching both expressions at the same time are shown:</para>
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<programlisting > journalctl _SYSTEMD_UNIT=avahi-daemon.service _PID=28097</programlisting>
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<para > If two matches refer to the same field, all entries matching either expression are shown:</para>
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<programlisting > journalctl _SYSTEMD_UNIT=avahi-daemon.service _SYSTEMD_UNIT=dbus.service</programlisting>
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<para > If the separator <literal > +</literal> is used,
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two expressions may be combined in a logical OR. The
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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>
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<para > Show all logs generated by the D-Bus executable:</para>
<programlisting > journalctl /usr/bin/dbus-daemon</programlisting>
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<para > Show all logs of the kernel device node <filename noindex= 'true' > /dev/sda</filename> :</para>
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<programlisting > journalctl /dev/sda</programlisting>
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</refsect1>
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<refsect1 >
<title > See Also</title>
<para >
<citerefentry > <refentrytitle > systemd</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry> ,
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<citerefentry > <refentrytitle > systemd-journald.service</refentrytitle> <manvolnum > 8</manvolnum> </citerefentry> ,
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<citerefentry > <refentrytitle > systemctl</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry> ,
2012-04-03 22:31:48 +02:00
<citerefentry > <refentrytitle > systemd.journal-fields</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry> ,
2012-03-30 23:18:33 +02:00
<citerefentry > <refentrytitle > journald.conf</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
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</para>
</refsect1>
</refentry>
