Split a file every 20000 lines

Split.js

fs = require('fs');
path = require('path');

var log = path.join( path.dirname( fs.realpathSync(__filename) ), 'meza-dev.log' );

fs.readFile( log, 'utf8', function(err,data){
	if (err) {
		return console.log(err);
	}

	var lines = data.split("\n");
	var count = lines.length;

	console.log( count + " lines..." );

	var i = 0;
	var newFileText = "";
	while( lines[i] ) {
		newFileText += lines[i] + "\n";
		if ( i % 20000 === 0 ) {
			fs.writeFile( "log" + i + ".log", newFileText.substr(), 'utf8', function(err){
				if(err) { console.log(err); }
			});
			newFileText = "";
		}
		i++;
	}

});