A little asynchronous multi-file grep

littlemultifilegrep.js

(function() {
	const fs = require('fs');
	if (process.argv.length < 4) {
		console.error('Not enough parameters given. Try this: "node littlemultifilegrep filename.txt term"'); 
		process.exit(1);
	}
	
	filenames = process.argv.slice(2, -1);
	searchterm = process.argv.slice(-1);

	search = function(err, contents) {
		var buffer = '';
		for(i = 0; i<contents.length; i++) {
			if(contents[i] === '\n') {
				if(buffer.indexOf(searchterm) > -1) {
					console.log(buffer);
				}
				buffer = '';
				continue;
			}
			buffer += contents[i];
		}
	} 

	filenames.forEach(function(filename){
		fs.readFile(filename, 'utf-8', search); 
	});

	console.log('Results: ');
})();