title: Convert string to decimal and calculate, in shell scripting
body: <p>I am new to shell scripting. My input file looks like below:</p>
  
  <pre><code>1.54
  3.235
  .7
  </code></pre>
  
  <p>I read this file, as each line into one variable.</p>
  
  <pre><code>ONE=`sed -n '1p' file`;
  TWO=`sed -n '2p' file`;
  THREE=`sed -n '3p' file`;
  </code></pre>
  
  <p>Now, I need to do some calculations ( like multiplication, division..) on these variables.
  Anyone please advise.</p>