ignored for <varname>x</varname>,
<varname>r</varname>, <varname>R</varname>,
<varname>L</varname> lines.</para>
+
+ <para>Optionally, if prefixed with
+ <literal>~</literal> the access mode is masked
+ based on the already set access bits for
+ existing file or directories: if the existing
+ file has all executable bits unset then all
+ executable bits are removed from the new
+ access mode, too. Similar, if all read bits
+ are removed from the old access mode they will
+ be removed from the new access mode too, and
+ if all write bits are removed, they will be
+ removed from the new access mode too. In
+ addition the sticky/suid/gid bit is removed unless
+ applied to a directory. This
+ functionality is particularly useful in
+ conjunction with <varname>Z</varname>.</para>
</refsect2>
<refsect2>