title: Adding a directory to PATH in Ubuntu
body: <p>I am a new user of Linux, just switched from Windows. I installed ActiveTcl-8.5 in <code>/opt/ActiveTcl-8.5/</code>, now I want to add its <code>bin</code> directory to the UNIX path.</p>
  
  <p>I have read a number of articles from the net and got confused about which file to modify. My <code>/home/tofayel</code> directory contains <code>.bashrc</code>, <code>.bash_logout</code>, <code>.bash_history</code>, and <code>.profile</code>; but not <code>.bash_login</code> and <code>.bash_profile</code>.</p>
  
  <p>Where do I add the extra lines to add <code>/opt/ActiveTcl-8.5/bin</code> to PATH?</p>