Enable or disable sites in /etc/hosts using nodejs

toggle_hosts.js

var fs = require('fs');

var sites = [
	'example.com',
	'test.com'
];

if(process.argv[2]) {

	if(process.argv[2] == 'enable' || process.argv[2] == 'disable') {

		fs.readFile('/etc/hosts', function(err, data) {
			var lines = data.toString('utf8').split('\n');

			lines.forEach(function(line, i) {
				sites.forEach(function(domain) {
					if(line.split(' ')[1] == domain) {
						if(process.argv[2] == 'enable') {
							if(line.substr(0, 1) == '#') {
								lines[i] = line.substr(1);
							}
						}
						else if(process.argv[2] == 'disable') {
							if(line.substr(0, 1) != '#') {
								lines[i] = '#' + line;
							}
						}
					}
				});
			})

			fs.writeFile('/etc/hosts', lines.join('\n'), function(err) {
				if(err) throw err;
				console.log("Sites " + process.argv[2] + 'd');
			});	
		});
	}
	else {
		console.log("'" + process.argv[2] + "' is an invalid choice, please pass in 'enable' or 'disable'!");
	}
}