Вывести список всех расширений файлов

find /path/to/files -type f -iname '*.*' | rev | cut -d . -f1 | rev | sort | uniq -ic | sort -rn | awk '{print $2,"\t",$1}'

path = '/tmp'

extensions = Hash.new()

Dir.glob(File.join(path, "*")).each do |f|
	ext = File.extname(f)

	if not (ext.nil? or ext.empty?) then
		extensions[ext] = extensions[ext].to_i + 1
	end	
end

extensions.each do |ext, count|
	puts "Extension: #{ext} Files count: #{count}"
end

path = '/tmp'
hext = Hash.new(0)

Dir[File.join(path, "*")].each do |fname|
	ext = File.extname(fname)
	hext[ext] += 1 if ext && !ext.empty?
end

hext.each do |ext, count|
	puts "Extension: #{ext} Files count: #{count}"
end