man: reuse common-variables in systemd(1)
This requires a bit of gimnastics, but I think it's still better than status quo ante, and better than duplicating the text.
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+24
-20
@@ -628,40 +628,44 @@
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<para>Some of the variables understood by <command>systemd</command>:</para>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_COLOR</varname></term>
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<listitem><para>Controls whether systemd highlights important log messages. This can be overridden
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with <option>--log-color=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_LEVEL</varname></term>
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<listitem><para>systemd reads the log level from this environment variable. This can be overridden
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with <option>--log-level=</option>.</para></listitem>
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<listitem><xi:include href="common-variables.xml" xpointer="log-level-body" />
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<para>This can be overridden with <option>--log-level=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_LOCATION</varname></term>
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<listitem><para>Controls whether systemd prints the code location along with log messages. This can
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be overridden with <option>--log-location=</option>.</para></listitem>
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</varlistentry>
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<term><varname>$SYSTEMD_LOG_COLOR</varname></term>
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<listitem><xi:include href="common-variables.xml" xpointer="log-color-body" />
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_TARGET</varname></term>
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<listitem><para>systemd reads the log target from this environment variable. This can be overridden
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with <option>--log-target=</option>.</para></listitem>
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<para>This can be overridden with <option>--log-color=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_TIME</varname></term>
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<listitem><para>Controls whether systemd prefixes log messages with the current time. This can be
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overridden with <option>--log-time=</option>.</para></listitem>
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<listitem><xi:include href="common-variables.xml" xpointer="log-time-body" />
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<para>This can be overridden with <option>--log-time=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_LOCATION</varname></term>
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<listitem><xi:include href="common-variables.xml" xpointer="log-location-body" />
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<para>This can be overridden with <option>--log-location=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_TID</varname></term>
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<listitem><para>Controls whether systemd prefixes log messages with the current thread ID
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(TID).</para></listitem>
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<listitem><xi:include href="common-variables.xml" xpointer="log-tid-body" /></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_TARGET</varname></term>
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<listitem><xi:include href="common-variables.xml" xpointer="log-target-body" />
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<para>This can be overridden with <option>--log-target=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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