title: TCL : Concatenate a variable and a string
body: <p>Assume we have a variable 'a' set to 12345 :</p>
  
  <pre><code>set a 12345
  </code></pre>
  
  <p>Now how do i set a new variable 'b' which contains the value of 'a' and another string say 9876</p>
  
  <p>workaround is something like</p>
  
  <pre><code>set a "12345"
  set u "9876"
  
  set b $a$u
  </code></pre>
  
  <p>but i dont want to specify <code>$u</code> instead i want the direct string to used..</p>