title: How to get nth column with regexp delimiter
body: <p>Basically I get line from <code>ls -la</code> command:</p>
  
  <pre><code>-rw-r--r--  13 ondrejodchazel  staff  442 Dec 10 16:23 some_file
  </code></pre>
  
  <p>and want to get size of file (442). I have tried <code>cut</code> and <code>sed</code> commands, but was unsuccesfull. Using just basic UNIX tools (cut, sed, awk...), how can i get specific column from stdin, where delimiter is <code>/ +/</code> regexp?</p>