Grunt task to count the number of lines given from bunch of files

gistfile1.txt

var fs = require('fs');
var path = require('path');
module.exports = function(grunt) {
	
	grunt.registerMultiTask('linecounter', 'counts the number of lines in files', function( ) {
		var count = 0;
		var done = this.async();
		this.files[0].src.forEach(function(a) {
			console.log(a);
			fs.createReadStream(a).on('data', function(chunk) {
				 for (i=0; i < chunk.length; ++i)
      				if (chunk[i] === 10) count++;
			}).on('end', function() {
				console.log(count);
				//How do i know when the last file is read and then only display the count value
				
			});


		});


	});

	grunt.initConfig({
		linecounter : { 
			t1 : {
				src : ['UI/**/*.js']
			}
		}
	})
}