title: bash - change value in array
body: <p>I have a problem with change value in array.
  I have several arrays: tab1, tab2.... etc. 
  I want to change some value in these arrays using two variable:</p>
  
  <pre><code>x=2
  y=3
  tab$y[$x]="#"
  </code></pre>
  
  <p>it doesn't work.
  Could anyone help me?</p>