using RC example

rc_example

//
// config.js
//
var rc = require('rc')
// name and defaults
module.exports = rc('coolModule', {
  port: 8080,
  spec: {
    dir: 'a/path/to/somewhere',
    timeout: 5
  }
})


//
// index.js
//
var config = require('./config.js')
console.log(config.port)



//
// in command line
//
> node index.js
8080

> node index.js --port=9090
9090

> export coolModule_port=7070
> node index.js
7070

> echo '{ "port": 6060 }' > /home/ec2-user/.coolModulerc
> node index.js
6060

> node index.js --spec.timeout=10 //change timeout to 10

for more options see

https://github.com/dominictarr/rc