Simple Node.js File Duplication Script

duplicate_file.js

// Takes in two flags in when running the terminal process
// Example: INPUT=test.js OUTPUT=test2.js node duplicate_file.js

const fs = require('fs');
const { INPUT, OUTPUT } = process.env;

if(INPUT && OUTPUT) {
  fs.readFile(INPUT, (err, data) => {
    if (err) throw err;

    fs.writeFile(OUTPUT, data.toString('utf8'), err => {
      if (err) throw err;
      console.log('File saved!');
    });
  });
}