title: Choosing the largest number within the column if the first column is equal to other lines
body: <p>I want to the program read the column 1, and if the number repeats, look for the column 5 which value is higher</p>
  
  <pre><code>1_248637391 .   C   T   592.4
  1_248637391 .   C   T   505.79
  1_248637400 .   C   A   600.00
  1_248756167 rs61732484  C   G   1243.19
  1_248756167 rs61732484  C   G   2002.61
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>1_248637391 .   C   T   592.4
  1_248637400 .   C   A   600.00
  1_248756167 rs61732484  C   G   2002.61
  </code></pre>
  
  <p>I'm working with big dataset, if someone known how to solve it by bash it would be awesome! Thank you soo much for the attention!</p>