ls_all.rb

#!/usr/bin/env ruby
#List all file below this location

path = File.expand_path( $0 )
puts path

def list_files( files, spacer='', path='.')
   path = File.expand_path( path )

   files.each do |f|

      if File.directory?( f )
         puts spacer + f + '/'

         recursive_path=File.expand_path( f )
         Dir.chdir( recursive_path )
         recursive_files = Dir.glob('*')
         recursive_spacer = spacer + ' '
         list_files(recursive_files, recursive_spacer, recursive_path)
      else
         puts spacer + f
      end
      Dir.chdir( path )
   end

end

#Dir.chdir( path )
files = Dir.glob('*')
list_files( files )