title: Concatention of number and scalar in Perl
body: <p>I am trying login in to all machines. So wrote a Perl script</p>
  
  <pre><code>my $i = 7;
  while ($i &lt; 20){
      my $key = "192\.235\.2\.$i.1 ";
      print $key;
      $i++;
  }
  </code></pre>
  
  <p>which runs from <code>192.235.2.71</code> to <code>.191</code>. But concatenation failing here.</p>