Select 10 most recent files with Ruby
base_dir = '/tmp/'
Dir.entries(base_dir).select{|f| File.file? "#{base_dir}#{f}" }.sort_by { |f| File.mtime("#{base_dir}#{f}") }.reverse[0..9]
dir snippets
How to sort by directory and file type with ls
ls --group-directories-first --sort=extension -l