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require 'zlib'

file = 'compressed.gz'
Zlib::GzipWriter.open(file) do |gzip|
  gzip << "this is a test."
  gzip.close
end


open('compressed.gz', 'wb') do |file|
  gzip = Zlib::GzipWriter.new(file)
  gzip << "this is a test."
  gzip.close
end