A ruby script to bin photos by year-month directories (assumes jpgs are in a standard ISO8601ish format; e.g. 2014-01-10_13-23-22.jpg).

photo_bin.rb

#!/usr/bin/env ruby

require 'date'
require 'fileutils'

raise ArgumentError.new "Usage: #{$0} directory" unless ARGV.count == 1

root_dir = File.expand_path ARGV.first

Dir.glob "#{root_dir}/*.jpg" do |file|
  match = /.*?(\d\d\d\d)-(\d\d)-\d\d_\d\d-\d\d-\d\d.*\.jpg$/.match file
  raise ArgumentError.new "File did not match: #{file}" unless match

  year           = match[1]
  month          = match[2]
  month_abbr     = Date::MONTHNAMES[month.to_i][0..2]
  photo_dir_name = "#{year}-#{month}-#{month_abbr}"
  photo_abs_dir  = File.join root_dir, photo_dir_name
  abs_file       = File.expand_path file

  Dir.mkdir photo_abs_dir unless Dir.exist? photo_abs_dir
  FileUtils.mv abs_file, photo_abs_dir
end