Getting a list of folders in a directory

Question

How do I get a list of the folders that exist in a certain directory with ruby?

Dir.entries() looks close but I don't know how to limit to folders only.

Answer 1

I think You can test each file if it is directory with FileTest.directory? (file_name). See documentation of FileTest for more info: http://ruby-doc.org/core/classes/FileTest.html

Answer 2

You can use File.directory? from the FileTest module to find out if a file is a directory. Combining this with Dir.entries makes for a nice one(ish)-liner:

directory = 'some_dir'
Dir.entries(directory).select { |file| File.directory? File.join(directory, file}

Edit: Updated per ScottD's correction.

Answer 3

Jordan is close, but Dir.entries doesn't return the full path that File.directory? expects. Try this:

 Dir.entries('/your_dir').select {|entry| File.directory? File.join('/your_dir',entry) and !(entry =='.' || entry == '..') }

Answer 4

directory = 'Folder'
puts Dir.entries(directory).select { |file| File.directory? File.join(directory, file)}

Answer 5

In my opinion Pathname is much better suited for filenames than plain strings.

require "pathname"
Pathname.new(directory_name).children.select { |c| c.directory? }

This gives you an array of all directorys in that directory as Pathname objects.

If you want to have strings

Pathname.new(directory_name).children.select { |c| c.directory? }.collect { |p| p.to_s }

If directory_name was absolute, these strings are absolute too.