demo_readline.js:
C:\Users\My Name>node demo_readline.js
Line number 1: <!DOCTYPE html>
Line number 2: <html>
Line number 3: <title>Demo - Open file</title>
Line number 4: <body>
Line number 5: <h1>My Header</h1>
Line number 6: <p>My paragraph</p>
Line number 7: </body>
Line number 8: </html>