Generate a CSV file – write rows to csvout.csv, read and print

CSV_generate.rb

require 'csv'
outfile = File.open('csvout.csv', 'wb')
  CSV::Writer.generate(outfile) do |csv|
    csv << ['c1', nil, 5]
    csv << ['c2', 1, 2, 'abc']
  end
outfile.close

#also read the file and print

require 'csv'
  CSV::Reader.parse(File.open('csvout.csv', 'rb')) do |row|
  # Process the row
  p row[0].data    # e.g. print the contents of the first cell
end