title: changing to parent directory in unix
body: <p>in general we use </p>
  
  <p><code>cd ..</code> for going to the parent directory</p>
  
  <p><code>cd ../../</code> to go to the parents parent directory. and </p>
  
  <p><code>cd ../../../../../</code> for 5th parent directory.</p>
  
  <p>is there any simplified way of doing this?</p>
  
  <p>shell i am  using is ksh.</p>