creating recurring named folders with Automator

#!/usr/bin/ruby """ pf.rb - Using the first three characters of the filenames make new folders with these strings, and then move every file with matching first three characters into its corresponding folder. Usage: ./pf.rb parent folder passed in from command-line or Automator Reference: https://discussions.apple.com/thread/8586956 Tested: macOS 10.14.0 with System Ruby version Version: 1.2 Author: VikingOSX, 2018-10-16, Apple Support Communities, No warranties of any kind. """ require 'fileutils' require 'set' newfolders = Set.new allfiles = Set.new these_files = [] regex = /\A([A-Z]{3})(?=_)/ afolder = File.expand_path(ARGV.first) # get an ordered set of new folder names from the filenames Dir.glob("#{afolder}/*.{jpg,jpeg,jp2}").sort.each do |f| newfolders << regex.match(File.basename(f)).captures.join allfiles << f end # make the new folders, and move matching files into them newfolders.each do |f| FileUtils.mkdir(File.join(afolder, f)) these_files = allfiles.grep(/#{f}/) these_files.map do |x| FileUtils.mv(x, File.join(afolder, f.to_s, File.basename(x))) end end