title: How to rewrite `-r-------- 1 apache apache a.txt`?
body: <p>There's a file <code>-r--------  1 apache  apache a.txt</code>.<br>
  Now,I open <code>GNOME Terminal 3.14.3</code>. Even <code>su root</code> cannot rewrite this file.
  How can I solve this problem?</p>