prints a string to the screen whenever another 100 kilobytes of the file have been downloaded.
require 'net/ftp'
ftp = Net::FTP.new('ftp.ruby-lang.org')
ftp.passive = true
ftp.login
ftp.chdir('/pub/ruby/1.8')
ftp.getbinaryfile('stable-snapshot.tar.gz', 'local-filename', 102400) do |blk|
puts "A 100KB block of the file has been downloaded"
end
ftp.close
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