title: converting hex to decimal with bash
body: <p>I've seen some strange things.
  I tried to convert hex to dec with <strong>bash Shell</strong></p>
  
  <p>I used very very simple command.</p>
  
  <pre><code>$ g_receiverBeforeToken=1158e460913d00000
  $ echo $((16#$g_receiverBeforeToken))
  1553255926290448384
  </code></pre>
  
  <p>As you guys know, this result should be '20000000000000000000'.</p>
  
  <p>When I put in any other hex number, it was correct. But only <strong>1553255926290448384</strong> was weird.</p>