title: How do I open a file whose full name is unknown with Perl?
body: <p>I want to know if there is anything that lets me do the following:</p>
  
  <pre><code>folder1 has files "readfile1" "f2" "fi5"
  </code></pre>
  
  <p>The only thing I know is that I need to read the file which starts with <code>readfile</code>, and I don't know what's there in the name after the string <code>readfile</code>. Also, I know that no other file in the directory starts with <code>readfile</code>.</p>
  
  <p>How do I open this file with the <code>open</code> command?</p>
  
  <p>Thank you.</p>