The code from the Learn JavaScript the Hard Way module JavaScript Level 1 exercises. This is a mirror of the code I have in the book, so if you're struggling you can use this to compare against your attempts.
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// Exercise 10: Files, Args, Variables, Oh My
const fs = require('fs');
let file_to_open = process.argv[2];
let file_contents = fs.readFileSync(file_to_open);
console.log(`The file named ${file_to_open} contains:`);
console.log(file_contents.toString());