Line count of daily logfiles in a given folder

lines_per_log.rb

#!/usr/bin/ruby
require 'date'

PATH        = "//server_name/and/folder_path/redacted"
EXTENSION   = 'txt'

# Parse out a date from each filename, print per-day line counts
Dir["#{PATH}/*.#{EXTENSION}"].each do |log_file|
  return_value = ''

  date_string = /\d{8}/.match(log_file).to_s
  return_value << Date.parse(date_string).strftime("%Y/%m/%d\t")

  open(log_file) { |f| return_value << f.lines.count.to_s }

  puts return_value
end