title: What does $'\n' mean in bash?
body: <p>An answer in this stackoverflow question <a href="https://stackoverflow.com/questions/5051556/in-a-linux-shell-how-can-i-process-each-line-of-a-multiline-string">In a Linux shell how can I process each line of a multiline string?</a> mentions that <code>$'\n'</code> is a special syntax "is not available in every shell".</p>
  
  <p>I wonder what does the syntax mean?</p>
  
  <p>Thank you.</p>