title: Understanding lsof output
body: <p>lsof seems to have duplicate entries for me.</p>
  
  <pre><code>1:fs:java      19644  4961      abc  mem       REG              252,1   126331  118159613 abc.jar
  1:fs:java      19644  4962      abc  mem       REG              252,1   126331  118159613 abc.jar
  </code></pre>
  
  <p>lsof format is:</p>
  
  <pre><code>COMMAND     PID   USER   FD     TYPE            DEVICE   SIZE/OFF     NODE NAME
  </code></pre>
  
  <p>19644 is PID. abc is USER. what is 4961 and 4962? And why do we have 100s of these. Only difference among all of these is 3rd column 4961, 4962 and so on? </p>