var fs = require('fs')
, ini = require('ini')
var config = ini.parse(fs.readFileSync('./config.ini', 'utf-8'))
config.scope = 'local'
config.database.database = 'use_another_database'
config.paths.default.tmpdir = '/tmp'
delete config.paths.default.datadir
config.paths.default.array.push('fourth value')
fs.writeFileSync('./config_modified.ini', ini.stringify(config, { section: 'section' }))