hexdump.js/bin/cli.js

#!/usr/bin/env node
(function () {
'use strict';

var hexdump = require('../').hexdump;
var fsname = process.argv[2];
var fs = require('fs');

if (!fsname || '--help' === fs || '-h' === fs) {
  console.error('Usage: hexdump.js <filepath>');
  process.exit(2);
  return;
}

try {
  fs.statSync(fsname);
} catch(e) {
  console.error(e.message);
  process.exit(3);
  return;
}

var nb = fs.readFileSync(fsname);
var str = hexdump(nb.buffer, nb.byteOffset, nb.byteLength);
console.log(str);

}());