如果 Ruby 不存在，则创建目录 [英] Create Directory if it doesn't exist with Ruby

问题描述

我正在尝试使用以下代码创建目录:

I am trying to create a directory with the following code:

Dir.mkdir("/Users/Luigi/Desktop/Survey_Final/Archived/Survey/test")
    unless File.exists?("/Users/Luigi/Desktop/Survey_Final/Archived/Survey/test")  

但是，我收到此错误:

没有这样的文件或目录 -/Users/Luigi/Desktop/Survey_Final/Archived/Survey/test (Errno::ENOENT)

No such file or directory - /Users/Luigi/Desktop/Survey_Final/Archived/Survey/test (Errno::ENOENT)

为什么这个目录不是由上面的 Dir.mkdir 语句创建的?

Why is this directory not being created by the Dir.mkdir statement above?

推荐答案

您可能正在尝试创建嵌套目录.假设 foo 不存在，您将收到 no such file or directory 错误:

You are probably trying to create nested directories. Assuming foo does not exist, you will receive no such file or directory error for:

Dir.mkdir 'foo/bar'
# => Errno::ENOENT: No such file or directory - 'foo/bar'

要一次性创建嵌套目录，需要FileUtils:

To create nested directories at once, FileUtils is needed:

require 'fileutils'
FileUtils.mkdir_p 'foo/bar'
# => ["foo/bar"]

Edit2:你不必使用FileUtils，你可以做系统调用(@mu 更新太短注释):

you do not have to use FileUtils, you may do system call (update from @mu is too short comment):

> system 'mkdir', '-p', 'foo/bar' # worse version: system 'mkdir -p "foo/bar"'
=> true

但这似乎(至少对我而言)是更糟糕的方法，因为您正在使用在某些系统上可能不可用的外部工具"(尽管我很难想象没有 mkdir 的系统，但谁知道).

But that seems (at least to me) as worse approach as you are using external 'tool' which may be unavailable on some systems (although I can hardly imagine system without mkdir, but who knows).

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