title: awk single column to multiple columns
body: <p>My input file looks like this,</p>
  
  <pre><code>0   1.0069770730517629     
  0   1.0068122761874614     
  0   1.0004297763706849     
  1   1.0069220626905635     
  1   1.0079998216945956     
  1   1.0006092898635817     
  2   1.0071274842017928    
  2   1.0083750686808803     
  2   1.0006868227863552     
  3   1.0073693844413083     
  3   1.0086546525825624     
  3   1.0007234442925264   
  </code></pre>
  
  <p>And I want the output file looks like this,</p>
  
  <pre><code>0   1.0069770730517629     1.0068122761874614     1.0004297763706849     
  1   1.0069220626905635     1.0079998216945956     1.0006092898635817     
  2   1.0071274842017928     1.0083750686808803     1.0006868227863552     
  3   1.0073693844413083     1.0086546525825624     1.0007234442925264 
  </code></pre>
  
  <p>I want to use grep or awk to split the single column to multiple ones. 
  Can anyone help me, pls?</p>