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Diffstat (limited to 'man/journalctl.xml')
| -rw-r--r-- | man/journalctl.xml | 56 |
1 files changed, 50 insertions, 6 deletions
diff --git a/man/journalctl.xml b/man/journalctl.xml index bb964b01ed..f314fb6d26 100644 --- a/man/journalctl.xml +++ b/man/journalctl.xml @@ -49,7 +49,7 @@ <refsynopsisdiv> <cmdsynopsis> - <command>journalctl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt">MATCH</arg></command> + <command>journalctl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt" rep="repeat">MATCHES</arg></command> </cmdsynopsis> </refsynopsisdiv> @@ -66,12 +66,25 @@ contents of the journal, starting with the oldest entry collected.</para> - <para>If a match argument is passed the output is - filtered accordingly. A match is in the format - <literal>FIELD=VALUE</literal>, - e.g. <literal>_SYSTEMD_UNIT=httpd.service</literal>. See + <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.</para> + 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, if the character + "<literal>+</literal>" appears as separate word on the + command line all matches before and after are combined + in a disjunction (i.e. logical OR).</para> <para>Output is interleaved from all accessible journal files, whether they are rotated or currently @@ -272,6 +285,37 @@ </refsect1> <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</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 expression 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> + + </refsect1> + + <refsect1> <title>See Also</title> <para> <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, |