Add OS version munging script

crunch-sessions-by-major-os-version.rb

@@ -0,0 +1,28 @@
+#!/usr/bin/env ruby -w
+
+require 'csv'
+
+HEADERS = %w[version sessions].freeze
+
+in_csv = CSV.new(ARGF)
+is_header = true
+
+zero_hash = Hash.new { |k, v| 0 }
+sessions_by_version = in_csv.inject(zero_hash) do |h, row|
+  if is_header
+    is_header = false
+    next h
+  end
+
+  version = row[1]
+  sessions = row[2].to_i
+  major_version = version.split('.').first
+  h[major_version] += sessions
+  h
+end
+
+puts CSV.generate_line(HEADERS)
+sessions_by_version.keys.map(&:to_i).sort.each do |version|
+  out_row = [version, sessions_by_version[version.to_s]]
+  puts CSV.generate_line(out_row)
+end