mirror of
https://github.com/systemd/systemd.git
synced 2024-11-23 18:23:32 +08:00
175 lines
6.2 KiB
XML
175 lines
6.2 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="systemd-cat"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>systemd-cat</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd-cat</refentrytitle>
|
|
<manvolnum>1</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd-cat</refname>
|
|
<refpurpose>Connect a pipeline or program's output with the journal</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<cmdsynopsis>
|
|
<command>systemd-cat <arg choice="opt" rep="repeat">OPTIONS</arg> <arg>COMMAND</arg> <arg choice="opt" rep="repeat">ARGUMENTS</arg></command>
|
|
</cmdsynopsis>
|
|
<cmdsynopsis>
|
|
<command>systemd-cat <arg choice="opt" rep="repeat">OPTIONS</arg></command>
|
|
</cmdsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><command>systemd-cat</command> may be used to connect the
|
|
standard input and output of a process to the journal, or as a
|
|
filter tool in a shell pipeline to pass the output the previous
|
|
pipeline element generates to the journal.</para>
|
|
|
|
<para>If no parameter is passed, <command>systemd-cat</command>
|
|
will write everything it reads from standard input (stdin) to the
|
|
journal.</para>
|
|
|
|
<para>If parameters are passed, they are executed as command line
|
|
with standard output (stdout) and standard error output (stderr)
|
|
connected to the journal, so that all it writes is stored in the
|
|
journal.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Options</title>
|
|
|
|
<para>The following options are understood:</para>
|
|
|
|
<variablelist>
|
|
<xi:include href="standard-options.xml" xpointer="help" />
|
|
<xi:include href="standard-options.xml" xpointer="version" />
|
|
|
|
<varlistentry>
|
|
<term><option>-t</option></term>
|
|
<term><option>--identifier=</option></term>
|
|
|
|
<listitem><para>Specify a short string that is used to
|
|
identify the logging tool. If not specified, no identification
|
|
string is written to the journal.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>-p</option></term>
|
|
<term><option>--priority=</option></term>
|
|
|
|
<listitem><para>Specify the default priority level for the
|
|
logged messages. Pass one of
|
|
<literal>emerg</literal>,
|
|
<literal>alert</literal>,
|
|
<literal>crit</literal>,
|
|
<literal>err</literal>,
|
|
<literal>warning</literal>,
|
|
<literal>notice</literal>,
|
|
<literal>info</literal>,
|
|
<literal>debug</literal>, or a
|
|
value between 0 and 7 (corresponding to the same named
|
|
levels). These priority values are the same as defined by
|
|
<citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
|
|
Defaults to <literal>info</literal>. Note that this simply
|
|
controls the default, individual lines may be logged with
|
|
different levels if they are prefixed accordingly. For details,
|
|
see <option>--level-prefix=</option> below.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>--stderr-priority=</option></term>
|
|
|
|
<listitem><para>Specifies the default priority level for
|
|
messages from the process's standard error output (stderr).
|
|
Usage of this option is the same as the
|
|
<option>--priority=</option> option, above, and both can be
|
|
used at once. When both are used, <option>--priority=</option>
|
|
will specify the default priority for standard output (stdout).
|
|
</para>
|
|
|
|
<para>If <option>--stderr-priority=</option> is not specified,
|
|
messages from stderr will still be logged, with the same
|
|
default priority level as stdout.</para>
|
|
|
|
<para>Also, note that when stdout and stderr use the same
|
|
default priority, the messages will be strictly ordered,
|
|
because one channel is used for both. When the default priority
|
|
differs, two channels are used, and so stdout messages will not
|
|
be strictly ordered with respect to stderr messages - though
|
|
they will tend to be approximately ordered.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>--level-prefix=</option></term>
|
|
|
|
<listitem><para>Controls whether lines read are parsed for
|
|
syslog priority level prefixes. If enabled (the default), a
|
|
line prefixed with a priority prefix such as
|
|
<literal><5></literal> is logged at priority 5
|
|
(<literal>notice</literal>), and similar for the other
|
|
priority levels. Takes a boolean argument.</para></listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Exit status</title>
|
|
|
|
<para>On success, 0 is returned, a non-zero failure code
|
|
otherwise.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Examples</title>
|
|
|
|
<example>
|
|
<title>Invoke a program</title>
|
|
|
|
<para>This calls <filename index="false">/bin/ls</filename>
|
|
with standard output and error connected to the journal:</para>
|
|
|
|
<programlisting># systemd-cat ls</programlisting>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Usage in a shell pipeline</title>
|
|
|
|
<para>This builds a shell pipeline also invoking
|
|
<filename>/bin/ls</filename> and writes the output it generates
|
|
to the journal:</para>
|
|
|
|
<programlisting># ls | systemd-cat</programlisting>
|
|
</example>
|
|
|
|
<para>Even though the two examples have very similar effects the
|
|
first is preferable since only one process is running at a time,
|
|
and both stdout and stderr are captured while in the second
|
|
example, only stdout is captured.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>logger</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|