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<refentry id="systemd-delta"
          xmlns:xi="http://www.w3.org/2001/XInclude">

        <refentryinfo>
                <title>systemd-delta</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-delta</refentrytitle>
                <manvolnum>1</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>systemd-delta</refname>
                <refpurpose>Find overridden configuration files</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <cmdsynopsis>
                        <command>systemd-delta</command>
                        <arg choice="opt" rep="repeat">OPTIONS</arg>
                        <arg choice="opt" rep="repeat"><replaceable>PREFIX</replaceable><optional>/<replaceable>SUFFIX</replaceable></optional>|<replaceable>SUFFIX</replaceable></arg>
                </cmdsynopsis>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

                <para><command>systemd-delta</command> may be used to
                identify and compare configuration files that override
                other configuration files. Files in
                <filename>/etc</filename> have highest priority, files
                in <filename>/run</filename> have the second highest
                priority, ..., files in <filename>/lib</filename> have
                lowest priority. Files in a directory with higher
                priority override files with the same name in
                directories of lower priority. In addition, certain
                configuration files can have <literal>.d</literal>
                directories which contain "drop-in" files with
                configuration snippets which augment the main
                configuration file. "Drop-in" files can be overriden
                in the same way by placing files with the same name in
                a directory of higher priority (except that in case of
                "drop-in" files, both the "drop-in" file name and the
                name of the containing directory, which corresponds to
                the name of the main configuration file, must match).
                For a fuller explanation, see
                <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
                </para>

                <para>The command line argument will be split into a
                prefix and a suffix. Either is optional. The prefix
                must be one of the directories containing
                configuration files (<filename>/etc</filename>,
                <filename>/run</filename>,
                <filename>/usr/lib</filename>, ...). If it is given,
                only overriding files contained in this directory will
                be shown. Otherwise, all overriding files will be
                shown. The suffix must be a name of a subdirectory
                containing configuration files like
                <filename>tmpfiles.d</filename>,
                <filename>sysctl.d</filename> or
                <filename>systemd/system</filename>. If it is given,
                only configuration files in this subdirectory (across
                all configuration paths) will be analyzed. Otherwise,
                all configuration files will be analyzed. If the
                commandline argument is not given at all, all
                configuration files will be analyzed. See below for
                some examples.</para>
        </refsect1>

        <refsect1>
                <title>Options</title>

                <para>The following options are understood:</para>

                <variablelist>
                        <varlistentry>
                                <term><option>-t</option></term>
                                <term><option>--type=</option></term>

                                <listitem><para>When listing the
                                differences, only list those that are
                                asked for. The list itself is a
                                comma-separated list of desired
                                difference types.</para>

                                <para>Recognized types are:

                                        <variablelist>
                                                <varlistentry>
                                                        <term><varname>masked</varname></term>

                                                        <listitem><para>Show masked files</para></listitem>
                                                </varlistentry>

                                                <varlistentry>
                                                        <term><varname>equivalent</varname></term>

                                                        <listitem><para>Show overridden
                                                        files that while overridden, do
                                                        not differ in content.</para></listitem>
                                                </varlistentry>

                                                <varlistentry>
                                                        <term><varname>redirected</varname></term>

                                                        <listitem><para>Show files that
                                                        are redirected to another.</para></listitem>
                                                </varlistentry>

                                                <varlistentry>
                                                        <term><varname>overridden</varname></term>

                                                        <listitem><para>Show overridden,
                                                        and changed files.</para></listitem>
                                                </varlistentry>

                                                <varlistentry>
                                                        <term><varname>extended</varname></term>

                                                        <listitem><para>Show *.conf files in drop-in
                                                        directories for units.</para></listitem>
                                                </varlistentry>

                                                <varlistentry>
                                                        <term><varname>unchanged</varname></term>

                                                        <listitem><para>Show unmodified
                                                        files too.</para></listitem>
                                                </varlistentry>
                                        </variablelist>
                                </para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--diff=</option></term>

                                <listitem><para>When showing modified
                                files, when a file is overridden show a
                                diff as well. This option takes a
                                boolean argument. If omitted, it defaults
                                to <option>true</option>.</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>Examples</title>

                <para>To see all local configuration:</para>
                <programlisting>systemd-delta</programlisting>

                <para>To see all runtime configuration:</para>
                <programlisting>systemd-delta /run</programlisting>

                <para>To see all system unit configuration changes:</para>
                <programlisting>systemd-delta systemd/system</programlisting>

                <para>To see all runtime "drop-in" changes for system units:</para>
                <programlisting>systemd-delta --type=extended /run/systemd/system</programlisting>
        </refsect1>

        <refsect1>
                <title>Exit status</title>

                <para>On success, 0 is returned, a non-zero failure
                code otherwise.</para>
        </refsect1>

        <refsect1>
                <title>See Also</title>
                <para>
                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                </para>
        </refsect1>

</refentry>
