let fs = require('fs');
const path = './Kevin';

fs.readdir(path, (err, items) => {
  if (err) console.log(err);
  else {
    items.forEach(oldFile => {
      const name = oldFile.split('Port');
      name[1] = name[1].split(' ').join('_');
      let newName = name.join('Port');

      fs.rename(oldFile, newName, err => {
        if (err) console.log(err);
        console.log('Kevin smd');
      });
    });
  }
});