Basic usage of commander.js

index.js

var commander = require('commander');

commander.version('0.0.1')
         .option('-h, --host <n>', 'The hostname', 'localhost')
         .option('-p, --port <n>', 'The port', 8080)
         .option('-t, --topic <n>', 'The topic', 'foo')
         .parse(process.argv);

var host = commander.host
var port = commander.port
var topic = commander.topic

console.log(host, port, topic);

Usage:

node index.js -h some.host.com --port 8081

Should output:

some.host.com 8081 foo