Create Directory if it doesn't exist with Ruby

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")

However, I'm receiving this error:

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

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

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'

To create nested directories at once, `FileUtils` is needed:

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

Edit2: 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

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).

Another simple way:

`Dir.mkdir('tmp/excel') unless Dir.exist?('tmp/excel')`

How about just `Dir.mkdir('dir') rescue nil` ?

Simple way:

directory_name = "name"
Dir.mkdir(directory_name) unless File.exists?(directory_name)