man: document $MAINPID
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<varlistentry>
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<term><varname>StandardError=</varname></term>
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<listitem><para>Controls where file
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descriptor 2 (standard error) of the
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descriptor 2 (STDERR) of the
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executed processes is connected to.
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The available options are identical to
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those of
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@ -1208,6 +1208,17 @@
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tty.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$MAINPID</varname></term>
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<listitem><para>The PID of the units
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main process if it is known. This is
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only set for control processes as
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invoked by
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<varname>ExecReload=</varname> and
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similar. </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$MANAGERPID</varname></term>
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