title: Change directory permanently in a bash script
body: <p>I'm trying to change directory in a called bash script.
   For this I tried to use <code>cd</code> command. But after the script ends current directory is restoring to position before the script call. 
  I also tried to change <code>PATH</code> variable but it didn't show any effect too.
  Is there a way to do this? </p>