title: Batch file string concatenation
body: <p>Why is this string not concatenating?</p>
  
  <pre><code>@echo off
  set NUM_NODES=4
  set ENSEMBLE=127.0.0.1:2181
  
  for /l %%x in (2, 1, %NUM_NODES%) do (
      echo %%x
     set ENSEMBLE=%ENSEMBLE%,127.0.0.1:2%%x81
  )
  echo ensemble: %ENSEMBLES%
  </code></pre>
  
  <p>OUTPUT:</p>
  
  <pre><code>2
  3
  4
  ensemble: 127.0.0.1:2181,127.0.0.1:2481
  </code></pre>