download.rb

require 'net/ftp'
require 'timeout'

ftp = Net::FTP.new('ftp.sra.ebi.ac.uk')
ftp.login
puts "connected!"

errors = []
samples = ["SRR016000"]

samples.each do |sample|
  files = ftp.chdir("vol1/fastq/SRR016/#{sample}/")
  puts "changed directory"
  #files = ftp.list('SRR*')
  begin
    bytes_downloaded = 0
    file_name = "#{sample}_1.fastq.gz"
    Timeout.timeout(20000) do
      file_size = ftp.size(file_name)

      ftp.getbinaryfile(file_name) do |chunk|
        bytes_downloaded += chunk.size
        puts "#{bytes_downloaded} of #{file_size} bytes downloaded (#{bytes_downloaded * 100 / file_size}%)."
      end
    end
  rescue Timeout::Error
     errors << "File download timed out for: #{sample}"
     puts errors.last
  end
end
        ftp.close
puts "All done!"