in <filename>/etc</filename> have the highest priority, files in
<filename>/run</filename> take precedence over files with the same
name in <filename>/usr/lib</filename>. This can be used to
- override a system-supplied link file with a local file if needed;
- a symlink in <filename>/etc</filename> with the same name as a
- link file in <filename>/usr/lib</filename>, pointing to
- <filename>/dev/null</filename>, disables the link file
- entirely.</para>
+ override a system-supplied link file with a local file if needed.
+ As a special case, an empty file (file size 0) or symlink with the
+ same name pointing to <filename>/dev/null</filename>, disable the
+ configuration file entirely (it is "masked").</para>
<para>The link file contains a <literal>[Match]</literal> section,
which determines if a given link file may be applied to a given
<filename>/run</filename> take precedence over files with the same
name in <filename>/usr/lib</filename>. This can be used to
override a system-supplied configuration file with a local file if
- needed; a symlink in <filename>/etc</filename> with the same name
- as a configuration file in <filename>/usr/lib</filename>, pointing
- to <filename>/dev/null</filename>, disables the configuration file
- entirely.</para>
-
+ needed. As a special case, an empty file (file size 0) or symlink
+ with the same name pointing to <filename>/dev/null</filename>,
+ disable the configuration file entirely (it is "masked").</para>
</refsect1>
<refsect1>
<filename>/run</filename> take precedence over files with the same
name in <filename>/usr/lib</filename>. This can be used to
override a system-supplied configuration file with a local file if
- needed; a symlink in <filename>/etc</filename> with the same name
- as a configuration file in <filename>/usr/lib</filename>, pointing
- to <filename>/dev/null</filename>, disables the configuration file
- entirely.</para>
-
+ needed. As a special case, an empty file (file size 0) or symlink
+ with the same name pointing to <filename>/dev/null</filename>,
+ disable the configuration file entirely (it is "masked").</para>
</refsect1>
<refsect1>