DEFAULT_NUM = 10
 
 
def main(argv)
    unless argv.length <= 2
        print "Usage: ruby #{__FILE__} file-name [num]"
        exit 1
    end
 
    file_name = argv[0]
    num       = if argv[1].nil?
                    DEFAULT_NUM
                else
                    argv[1].to_i
                end
 
    unless num >= 1
        print "Invalid number"
        exit 1
    end
 
    write_file_by_n file_name, num
end
 
 
def write_file_by_n(input_file_name, num)
    File.open(input_file_name, 'r').each_line.each_slice(num).with_index do
        |lines, index|
 
        output_file_name = format "%s-%d", input_file_name, index + 1
        File.open(output_file_name, 'w') do |out_file|
            lines.each do |line|
                out_file.puts line
            end
        end
    end
end
 
 
if __FILE__ == $0
    main ARGV
end

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