title: Log4j, meaning of Append = true / false
body: <p>log4j.appender.LOGFILE.Append = true</p>
  
  <p>The doc says:</p>
  
  <blockquote>
    <p>If the append parameter is true, the file will be appended to. Otherwise, the file designated by filename will be truncated before being opened.</p>
  </blockquote>
  
  <p>Does it mean that if Append = true, new logs will be appended to the tail of the file? Then what does "truncated" indicate? Content will be deleted before the file being opened?</p>
  
  <p>Thank you.</p>