interactive-sample.js

const readline = require('readline')

const reader = readline.createInterface({
  input: process.stdin,
  output: process.stdout
})

reader.on('line', line => {
  if (line !== "fin") {
    console.log(line)
    reader.prompt()
  }
  else {
    reader.emit('close')
  }
})

reader.on('close', () => {
  console.log("bye bye !!")
  process.exit(1)
})

reader.prompt()