title: String concatenation doesn't work for comma character
body: <p>String concatenation on bash script doesn't work on comma "," character.</p>
  
  <pre><code>A="Hello";
  B=",World";
  C=$A$B
  echo $C;
  </code></pre>
  
  <p>It prints the output as</p>
  
  <blockquote>
    <p>Hello World</p>
  </blockquote>
  
  <p>Bash version is:</p>
  
  <pre><code>GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu)
  </code></pre>
  
  <p>The same code seems to work in <a href="http://www.tutorialspoint.com/execute_bash_online.php" rel="nofollow">here</a></p>