title: How can I search a large sorted file in Perl?
body: <p>Can you suggest me any CPAN modules to search on a large sorted file?</p>
  
  <p>The file is a structured data about 15 million to 20 million lines, but I just need to find about 25,000 matching entries so I don't want to load the whole file into a hash. </p>
  
  <p>Thanks.</p>