gzsplit

#!/usr/bin/env ruby
#
# gzsplit - split a file into gzipped pieces

filename = ARGV[0]
prefix = ARGV[1] || "part"
line_number = 0
chunk_size = 500_000
next_part_number = 0
gzip = nil

IO.popen(filename) do |line|
  if line_number % chunk_size == 0
    gzip = IO.popen("gzip > #{prefix}-#{'%04i' % next_part_number}.gz", "w")
    next_part_number += 1
  end

  gzip.puts line

  line_number += 1
end