format.js

'use strict'
const fs = require('fs')

const rs = fs.createReadStream(process.argv[2])

const ws = fs.createWriteStream(process.argv[3])

function run() {
  fs.statSync(process.argv[3], function(err) {
    if (err) return
    fs.unlinkSync(process.argv[3])
  })
  rs.on('data', function(buffer) {
    const chunk = buffer.toString().split('\n')

    chunk.map(function(val, i) {
      const row = val.split(',')
      if (+row[1] >= +process.argv[4]) {
        const newRow = `${row[0]},${row.slice(3)}\n`
        ws.write(newRow)
      }
    })
  })

  rs.on('end', function() {
    ws.end()
  })
}
run()