title: special character in UNIX
body: <p>I want to add backspace character literally in my file named junk. So I did following<br>
  $ ed<br>
  a<br>
  my name is happy\b  (here b means I typed backspace so \ gets disapperaed and cursor sits sfter y)<br>
  .<br>
  w junk<br>
  q   </p>
  
  <p>But when I do<br>
  $ od -cb junk<br>
  it doesn't show backspace.</p>