title: echo command with variable and string
body: <p>I have 3 variables I'm trying to insert into an echo command that contains the string, as well. </p>
  
  <p>Here is what I have:</p>
  
  <pre><code>1= "test1"
  2= "test2"
  3= "test3"
  
  FileName= "WEATHERMAP"_"$1"_"STATE"_"$2"_"CITY"_"$3" 
  
  echo $FileName
  </code></pre>
  
  <p>I want it to <code>echo WEATHERMAP_test1_STATE_test2_CITY_test3</code> <br> Instead I get <code>WEATHERMAP__STATE__CITY_</code></p>
  
  <p>I know this has something to do with the <code>underscore</code>, unfortunately, I need the <code>underscore</code>. </p>
  
  <p>The only examples I have seen are putting two variables together, or it started with a <code>variable</code> followed by a string.</p>