Cut big logs to chunks

cut_log.rb

#!/usr/bin/env ruby

log = ARGV[0]
chunk = 1024 * 1024 * 50 # 50 Mb

cursor = 0
cnt = 1

file_size = File.stat(log).size

while cursor <= file_size
  cnt_p = cnt < 10 ? "0#{cnt}" : cnt
  copy_to = File.join( File.dirname(log), "#{File.basename(log)}_#{cnt_p}" )
  IO.copy_stream(log, copy_to, chunk, cursor)
  puts "Written chunk to #{copy_to}"

  cursor += chunk
  cnt += 1
end