title: Using the tr command to change a single word into uppercase
body: <p>I'm having difficulty interpreting the <code>tr --help</code>.</p>
  
  <p>I know that</p>
  
  <pre><code>tr [:lower:] [:upper:] &lt;inputfile
  </code></pre>
  
  <p>turns all the characters in the file into uppercase</p>
  
  <p>How do I turn a single word into uppercase?</p>
  
  <p>I am not limited to using tr. I am looking for a way to scan a file (or input) for a set sequence for letters and then once it finds a match to turn them into uppercase letters.</p>