title: Interview questions at amazon in unix
body: <p>1.Count multiple occurences of your name in a file.. and your name is occurring multiple times in a line.</p>
  
  <p>2.Write a regular expression to retrieve “Ravi-10” from the file. And print only  the name “Ravi-10” (complete line should not be printed) .</p>
  
  <p>3.In a log file you have date in yyyy mm dd hh:mi:ss format. Retrive those dates where time is between 19:10:00 to 19:20:00</p>