man: document systemd-cat(1)

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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">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-cat">
+
+        <refentryinfo>
+                <title>systemd-cat</title>
+                <productname>systemd</productname>
+
+                <authorgroup>
+                        <author>
+                                <contrib>Developer</contrib>
+                                <firstname>Lennart</firstname>
+                                <surname>Poettering</surname>
+                                <email>lennart@poettering.net</email>
+                        </author>
+                </authorgroup>
+        </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 STDOUT and STDERR of a process with 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-command</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>
+                        <varlistentry>
+                                <term><option>--h</option></term>
+                                <term><option>--help</option></term>
+
+                                <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>-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 identifying
+                                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>, resp. a
+                                value between 0 and 7 (corresponding
+                                to the same named levels). These
+                                priority values are the same as
+                                defined by
+                                <citerefentry><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>--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>&lt;5&gt;</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>/bin/ls</filename>
+                        with STDOUT/STDERR 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><refentrytitle>logger</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                </para>
+        </refsect1>
+
+</refentry>