title: ubuntu bash scripting: configure file missing?
body: <p>in "Bash Guide for Beginners", it's said:</p>
  
  <p>Bash is the GNU shell, compatible with the Bourne shell and incorporating many useful features from other shells. When the shell is started, it reads its configuration files. The most important are:</p>
  
  <pre><code>/etc/profile
  
  ~/.bash_profile
  
  ~/.bashrc
  </code></pre>
  
  <p>however, in my ubuntu 11.10,<br>
   - there's no "~/.bash_profile": file explorer does not show it, and "ls -l ~/.bash_profile" says "No Such file or directory"<br>
   - there are "/etc/profile" and "~/.bashrc", but they don't show up in file explorer, only "ls -l /etc/profile" and "ls -l /.bashrc" shows the result. </p>
  
  <p>is there something missing during my installation?</p>