@alancnet/ftp-srv/src/commands/registration/cdup.js

Modern, extensible FTP Server

const cwd = require('./cwd').handler;

module.exports = {
  directive: ['CDUP', 'XCUP'],
  handler: function (args) {
    args.command.arg = '..';
    return cwd.call(this, args);
  },
  syntax: '{{cmd}}',
  description: 'Change to Parent Directory'
};