Need quick way to rename files according to a sequence?

README.md

quickstart

Let's assume you have OS X screenshots named like Screen Shot 2015-06-09 at 9.39.56 AM.png. You can use this script to rename them like so:

mark:screens mark$ ruby renamer.rb 
move ./Screen Shot 2015-06-09 at 9.39.56 AM.png to EXAMPLE_ONE_160x600_1.png
move ./Screen Shot 2015-06-09 at 9.39.57 AM.png to EXAMPLE_ONE_160x600_2.png
move ./Screen Shot 2015-06-09 at 9.39.58 AM.png to EXAMPLE_ONE_160x600_3.png
move ./Screen Shot 2015-06-09 at 9.40.00 AM.png to EXAMPLE_ONE_160x600_4.png
move ./Screen Shot 2015-06-09 at 9.40.30 AM.png to EXAMPLE_TWO_160x600_1.png
move ./Screen Shot 2015-06-09 at 9.40.31 AM.png to EXAMPLE_TWO_160x600_2.png
move ./Screen Shot 2015-06-09 at 9.40.32 AM.png to EXAMPLE_TWO_160x600_3.png
move ./Screen Shot 2015-06-09 at 9.40.34 AM.png to EXAMPLE_TWO_160x600_4.png

renamer.rb

require "fileutils"
names  = %w{EXAMPLE_ONE EXAMPLE_TWO}
sizes = %w{160x600-4}
expanded_sizes = sizes.map do |s|
  new_sizes = []
  size  = s.split("-")
  dims  = size[0]
  variations = size[1].to_i
  variations.times do |i|
    new_sizes << "#{dims}_#{i+1}"
  end
  new_sizes
end
expanded_sizes.flatten!
sizes = []
names.each do |name|
  sizes << expanded_sizes.map {|size| "#{name}_#{size}"}
end
sizes.flatten!

files = Dir.glob("./Screen*").sort_by {|pth| File.mtime(pth)}

raise Exception unless sizes.length == files.length

files.each_with_index do |path, idx|
  puts "move #{path} to #{sizes[idx]}.png"
  FileUtils.mv path, "#{sizes[idx]}.png"
end