shadow/man/login.defs.d/ENV_SUPATH.xml

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<varlistentry>
  <term><option>ENV_SUPATH</option> (string)</term>
  <listitem>
    <para>
      If set, it will be used to define the PATH environment variable when
      the superuser login. The value is a colon separated list of paths 
      (for example
      <replaceable>/sbin:/bin:/usr/sbin:/usr/bin</replaceable>) and can be
      preceded by <replaceable>PATH=</replaceable>. The default value is
      <replaceable>PATH=/sbin:/bin:/usr/sbin:/usr/bin</replaceable>.
    </para>
    <!-- TODO: it can in fact be used to set any other variable-->
  </listitem>
</varlistentry>