title: cannot grep lines that contain only decimal values
body: <p>I have a file that contains lines of the type:</p>
  
  <pre><code>DRAM  ACCESSES  PER WALK          60.727888
  L2 CACHE HITS   PER WALK          2083.990077
  L2 CACHE HITS   PER tLB           0.846624
  MMU    ACCESSES PER WALK          617298
  MMU L4 MATCHES                  869
  MMU NO MATCH                   1013
  MMU TOTAL ACCESSES          625953
  MMU L2 HIT   RATE             0.319430
  MMU L3 HIT   RATE             0.012439
  </code></pre>
  
  <p>I wish to keep only lines that contain the decimal values. I tried </p>
  
  <pre><code>cat originalfile | grep *.[0-9] , grep [0-9].[0-9] , grep [0-9]\.[0-9] 
  </code></pre>
  
  <p>but nothing seems to work. Please help me out.</p>