split.rb

$outdir = 'splitout'

def split file
  base = File.basename file
  if File.size(file) < 10000000
    puts `cp #{file} #{$outdir}/#{base}`
  else
    puts `zcat #{file} | split - -l 1000000 --filter='gzip > $FILE.gz' #{$outdir}/#{base[0..-3]}`
  end
end

split ARGV[0]