title: Using find to delete all files (without sub dir)
body: <p>Here is the structure of my dir:</p>
  
  <pre><code>./archive
      /sub1
          - file1
          - file2
      /sub2
          - file3
          - file4
  </code></pre>
  
  <p>I try with this command to find all the files that older than 6 months to delete it:</p>
  
  <pre><code>find ./archive -mindepth 1 -mtime +180 -delete
  </code></pre>
  
  <p>All the files and sub directory is deleted, what I want just the <code>file1, file2, file3, file4</code> that delete, not include the <code>sub1</code> and <code>sub2</code>, please advise.</p>