下面是一个使用util的例子。我如何移动文件a到不同的分区或设备在Node.js?

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

var is = fs.createReadStream('source_file')
var os = fs.createWriteStream('destination_file');

util.pump(is, os, function() {
    fs.unlinkSync('source_file');
});

我将把所有涉及的函数(即重命名，复制，断开链接)彼此分离，以获得灵活性，并承诺一切，当然:

const renameFile = (path, newPath) => 
  new Promise((res, rej) => {
    fs.rename(path, newPath, (err, data) =>
      err
        ? rej(err)
        : res(data));
  });

const copyFile = (path, newPath, flags) =>
  new Promise((res, rej) => {
    const readStream = fs.createReadStream(path),
      writeStream = fs.createWriteStream(newPath, {flags});

    readStream.on("error", rej);
    writeStream.on("error", rej);
    writeStream.on("finish", res);
    readStream.pipe(writeStream);
  });

const unlinkFile = path => 
  new Promise((res, rej) => {
    fs.unlink(path, (err, data) =>
      err
        ? rej(err)
        : res(data));
  });

const moveFile = (path, newPath, flags) =>
  renameFile(path, newPath)
    .catch(e => {
      if (e.code !== "EXDEV")
        throw new e;

      else
        return copyFile(path, newPath, flags)
          .then(() => unlinkFile(path));
    });

moveFile只是一个方便的函数，我们可以分别应用这些函数，例如，当我们需要更细粒度的异常处理时。

跑龙套。节点0.10弃用Pump，产生警告信息

 util.pump() is deprecated. Use readableStream.pipe() instead

因此，使用流复制文件的解决方案是:

var source = fs.createReadStream('/path/to/source');
var dest = fs.createWriteStream('/path/to/dest');

source.pipe(dest);
source.on('end', function() { /* copied */ });
source.on('error', function(err) { /* error */ });

下面是一个使用util的例子。我如何移动文件a到不同的分区或设备在Node.js?

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

var is = fs.createReadStream('source_file')
var os = fs.createWriteStream('destination_file');

util.pump(is, os, function() {
    fs.unlinkSync('source_file');
});

对于8.0.0以上的Node版本使用承诺:

const {promisify} = require('util');
const fs = require('fs');
const {join} = require('path');
const mv = promisify(fs.rename);

const moveThem = async () => {
  // Move file ./bar/foo.js to ./baz/qux.js
  const original = join(__dirname, 'bar/foo.js');
  const target = join(__dirname, 'baz/qux.js'); 
  await mv(original, target);
}

moveThem();

根据seppo0010的注释，我使用了重命名函数来完成此操作。

http://nodejs.org/docs/latest/api/fs.html#fs_fs_rename_oldpath_newpath_callback

fs。重命名(oldPath, newPath, callback) 新增于:v0.0.2 oldPath <String> | <Buffer> newPath <String> | <Buffer> . newPath <String> 回调函数> < 异步重命名(2)。除了可能的异常，没有参数 赋给完成回调函数。