title: watch file size on linux
body: <p>I want to watch the growing size of a single file, so i use this command:</p>
  
  <pre><code>texai@maelstrom ~$ ls -lh club_prod.sql | awk '{print $5}'
  116M
  </code></pre>
  
  <p>Now I want to watch that result each 5 seconds so:</p>
  
  <pre><code>texai@maelstrom ~$ watch -n 5 ls -lh club_prod.sql | awk '{print $5}'
  </code></pre>
  
  <p>but this command doesn't return any result</p>