gistfile1.txt

var sys = require('sys'),
	fs = require('fs');

(function (dir) {
	var search = arguments.callee;

	fs.readdir(dir, function (err, files) {
		if (files === undefined) return false;

		files.forEach(function (file) {
			var path = dir+'/'+file;

			fs.stat(path, function(err, stats){
				if (err) {
					sys.print('Error:'+err+'\n');
				} else if (stats.isFile()) {
					var newPath = dir+'/'+path.split('/').join('-')+'.txt';
					sys.print(path+'→'+newPath+'\n');
					fs.rename(path, newPath);
				} else {
					search(path);
				}
			});
		});
	});
})('box2d')