title: How to open large (10gb+) Text files and edit them
body: <p>I Have large  .txt file, over 10gb
  I should open this file and make simple editions:
  - remove duplicate lines
  - split this file (like 5x2gb files)</p>
  
  <p>What software I need? Windows pref... But if not possible Linux can be great too.
  Thanks! </p>