Question

Suppost I want to create a directory like “a/b/c” under the current dir.

How to make it?

I have tried this:

Dir.mkdir("a/b/c").

However it does not work.

Answer 1

I guess this is because parent directories of c do not exist. If you try to do the same in the shell you will also get an error. You can force creation of parent directories if they do not exist with the -p option:

mkdir -p a/b/c

which in Ruby can be done with mkdir_p found in the FileUtils module:

require "fileutils"

FileUtils::mkdir_p "a/b/c"