config.rb

require 'csv'

csv = CSV.read "ips.csv"
config = []

csv.each_with_index do |row,index|
  config << "Dest#{index}=#{row[0].gsub(/ /,'')}-#{row[3].gsub(/ /,'')}-#{row[2]}"
end

puts config.join "\r\n"

hosts.rb

require 'csv'

csv = CSV.read "ips.csv"
hosts = []

csv.each do |row|
  hosts << "#{row[1]} #{row[0].gsub(/ /,'')}-#{row[3]}-#{row[2]}"
end

puts hosts.join "\r\n"