title: Bash array from file
body: <p>So I'm having a text file called myfile that looks like:</p>
  
  <pre><code>epochdate1 floatvalue1
  epochdate2 floatvalue2
  ...
  epochdaten floatvaluen
  </code></pre>
  
  <p>I was thinking to create an array where I can extract some floatvalues: floatvaluen, floatvalue(n-1), floatvalue(n-100). </p>
  
  <p>How to achieve that? I mean how to declare this array from myfile and how to select the elements? </p>