How to create directories recursively in ruby?

I want to store a file as /a/b/c/d.txt, but I do not know if any of these directories exist and need to recursively create them if necessary. How can one do this in ruby?

Use mkdir_p:

FileUtils.mkdir_p '/a/b/c'

The _p is a unix holdover for parent/path you can also use the alias mkpath if that makes more sense for you.

FileUtils.mkpath '/a/b/c'

In Ruby 1.9 FileUtils was removed from the core, so you'll have to require 'fileutils'.

Use mkdir_p to create directory recursively

path = "/tmp/a/b/c"

FileUtils.mkdir_p(path) unless File.exists?(path)

If you are running on unixy machines, don't forget you can always run a shell command under ruby by placing it in backticks.

`mkdir -p /a/b/c`

Pathname to the rescue!

Pathname('/a/b/c/d.txt').dirname.mkpath

 require 'ftools'

File.makedirs

You could also use your own logic

def self.create_dir_if_not_exists(path)
  recursive = path.split('/')
  directory = ''
  recursive.each do |sub_directory|
    directory += sub_directory + '/'
    Dir.mkdir(directory) unless (File.directory? directory)
  end
end

So if path is 'tmp/a/b/c' if 'tmp' doesn't exist 'tmp' gets created, then 'tmp/a/' and so on and so forth.