color.rb

module Color

  def colorize(color, options = {})
    background = options[:background] || options[:bg] || false
    style = options[:style]
    offsets = ["gray","red", "green", "yellow", "blue", "magenta", "cyan","white"]
    styles = ["normal","bold","dark","italic","underline","xx","xx","underline","xx","strikethrough"]
    start = background ? 40 : 30
    color_code = start + (offsets.index(color) || 8)
    style_code = styles.index(style) || 0
    "\e[#{style_code};#{color_code}m#{self}\e[0m"
  end
end

down.rb

$LOAD_PATH << './lib'
require 'color'

class Download 
 require color
 
  def wget(arr)
      FileUtils.cd('/mnt/list')
      site = "xxxxx"
       arr.each do |f| 
            wget = system("wget #{site}#{f}")
                logger.info("wget: #{f}".colorize("blue"))
       end  
  end 

end

ERR.txt

Down.rb:114:in `block (2 levels) in wget': undefined method `colorize' for #<String:0x00000001152d30> (NoMethodError)
        from /usr/local/rvm/gems/ruby-1.9.3-p547/gems/nokogiri-1.6.2.1/lib/nokogiri/xml/node_set.rb:237:in `block in each'
        from /usr/local/rvm/gems/ruby-1.9.3-p547/gems/nokogiri-1.6.2.1/lib/nokogiri/xml/node_set.rb:236:in `upto'
        from /usr/local/rvm/gems/ruby-1.9.3-p547/gems/nokogiri-1.6.2.1/lib/nokogiri/xml/node_set.rb:236:in `each'