Is it possible to craft a glob that matches files in the current directory and all subdirectoies?

For this directory structure:

.
|-- README.txt
|-- firstlevel.rb
`-- lib
    |-- models
    |   |-- foo
    |   |   `-- fourthlevel.rb
    |   `-- thirdlevel.rb
    `-- secondlevel.rb

3 directories, 5 files

The glob would match:

firstlevel.rb 
lib/secondlevel.rb 
lib/models/thirdlevel.rb
lib/models/foo/fourthlevel.rb

From stackoverflow quackingduck

• In Ruby itself:

  Dir.glob('**/*.rb') perhaps?
  

  From James A. Rosen

• In zsh, **/*.rb works

  From Chris AtLee

• Looks like it can't be done from bash

  If you using zsh then

  ls **/*.rb
  

  will produce the correct result.

  Otherwise you can hijack the ruby interpreter (and probably those of other languages)

  ruby -e "puts Dir.glob('**/*.rb')"
  

  Thanks to Chris and Gaius for your answers.

  From quackingduck

• Apologies if I've missed the real point of the question but, if I was using sh/bash/etc., then I would probably use find to do the job:

  find . -name '*.rb' -type f
  

  Globs can get a bit nasty when used from within a script and find is much more flexible.

  From Nick