title: Only get hash value using md5sum (without filename)
body: <p>I use <a href="https://linux.die.net/man/1/md5sum" rel="noreferrer">md5sum</a> to generate a hash value for a file.
  But I only need to receive the hash value, not the file name.</p>
  <pre><code>md5=`md5sum ${my_iso_file}`
  echo ${md5}
  </code></pre>
  <p>Output:</p>
  <pre><code>3abb17b66815bc7946cefe727737d295  ./iso/somefile.iso
  </code></pre>
  <p>How can I 'strip' the file name and only retain the value?</p>