old_contents: var fs = require('fs');
  const {Pool} = require('pg');
  
  function batchPromises(batchSize, emails, fn){
    const current = emails.slice(0,batchSize)
    const rest = emails.slice(batchSize)
    console.log(current.length, rest.length)
  
    const currentPromises = current.map(fn);
    // we want to then this somehow, with Promise.all probably
  
    const restPromises = (rest.length === 0)
      ? []
      : batchPromises(batchSize,rest,fn);
  
    return Promise.all(currentPromises.concat(restPromises));
  }
  
  function updateConsent(database){
    //Still need to grab emails from a sensitive data file
    // const emails = JSON.parse(fs.readFileSync('./tmp/consented-latest.json'))
    const emails = JSON.parse(fs.readFileSync('./tmp/consented-latest.json'))
    const emailArray = emails.consented;
    console.log("processing", emailArray.length, " emails")
  
    const pool = new Pool({database});
    return batchPromises(5, emailArray, email => {
      const sql = `
        INSERT INTO consented_email (email,audio,permission,consent) 
        VALUES ($1,TRUE,TRUE,TRUE)
        ON CONFLICT (email)
        DO NOTHING
        ;`;
      const values = [email]
      return pool.query(sql,values);
    });
  }
  
  // Create a new database for test or development mode, and 
  // create the tables for the database.
  const databaseName = process.argv[2];
  updateConsent(databaseName)
    .then(results => {
      console.log(results.length,"emails inserted")
      // console.log("processing", results.length, " emails")
      console.log('Done updating database.');
      process.exit(0); // eslint-disable-line no-process-exit
    })
    .catch(err => {
      console.log('error', err);
      process.exit(1); // eslint-disable-line no-process-exit
    });
  
  
new_contents: var fs = require('fs');
  const {Pool} = require('pg');
  
  function batchPromises(batchSize, emails, fn){
    const current = emails.slice(0,batchSize)
    const rest = emails.slice(batchSize)
    console.log(current.length, rest.length)
  
    const currentPromises = current.map(fn);
    // we want to then this somehow, with Promise.all probably
  
    const restPromises = (rest.length === 0)
      ? []
      : batchPromises(batchSize,rest,fn);
  
    return Promise.all(currentPromises.concat(restPromises));
  }
  
  function updateConsent(database){
    //Still need to grab emails from a sensitive data file
    const emails = JSON.parse(fs.readFileSync("/dev/stdin", "utf-8"))
    const emailArray = emails.consented;
    console.log("processing", emailArray.length, " emails")
  
    const pool = new Pool({database});
    return batchPromises(5, emailArray, email => {
      const sql = `
        INSERT INTO consented_email (email,audio,permission,consent) 
        VALUES ($1,TRUE,TRUE,TRUE)
        ON CONFLICT (email)
        DO NOTHING
        ;`;
      const values = [email]
      return pool.query(sql,values);
    });
  }
  
  // Create a new database for test or development mode, and 
  // create the tables for the database.
  const databaseName = process.argv[2];
  updateConsent(databaseName)
    .then(results => {
      console.log(results.length,"emails inserted")
      // console.log("processing", results.length, " emails")
      console.log('Done updating database.');
      process.exit(0); // eslint-disable-line no-process-exit
    })
    .catch(err => {
      console.log('error', err);
      process.exit(1); // eslint-disable-line no-process-exit
    });
  
  
subject: change script to read from stdin