Node.jsでファイルをコピーする ref: http://qiita.com/okunishinishi@github/items/ec5cba6602a5bb872f13

file0.txt

$ cp src/*.html dest

file1.txt

var r = fs.createReadStream(src),
    w = fs.createWriteStream(dest);
r.pip(w);

file2.js

function _copySingle(src, dest, callback) {
    var aborted = false;

    var r = fs.createReadStream(src),
        w = fs.createWriteStream(dest);
    r.on("error", function (err) {
        done(err);
    });
    w.on("error", function (err) {
        done(err);
    });
    w.on("close", function (ex) {
        done();
    });
    r.pipe(w);

    function done(err) {
        if (aborted) {
            return;
        }
        callback(err);
        aborted = true;
    }
}

file3.js

var argx = require('argx'),
    async = require('async'),
    path = require('path'),
    glob = require('glob'),
    mkdirp = require('mkdirp'),
    fs = require('fs');
async.waterfall([
    function (callback) {
        async.concatSeries([].concat(src), glob, callback);
    },
    function (src, callback) {
        _isExistingDir(dest, function (destIsDir) {
            async.each(src, function (src, callback) {
                var srcFilename = path.resolve(src),
                    destFilename = destIsDir ? path.join(dest, path.basename(src)) : path.resolve(dest);
                async.series([
                    function (callback) {
                        if (options.mkdirp) {
                            mkdirp(path.dirname(destFilename), callback);
                        } else {
                            callback(null);
                        }
                    },
                    function (callback) {
                        _copySingle(srcFilename, destFilename, callback);
                    }
                ], callback);
            }, callback);
        });
    }
], callback);

function _isExistingDir(filename, callback) {
    fs.exists(filename, function (exists) {
        if (exists) {
            fs.stat(filename, function (err, stat) {
                callback(!err && stat.isDirectory());
            });
        } else {
            callback(false);
        }
    });
}