How do I capitalize the words?

ebert.rb

#!/usr/bin/ruby

tmp = "{query}"

# If there was a query, then parse the query
unless tmp.nil? || tmp == 0
  args = tmp.split
  num = args.at(0)
  char_limit = args.at(1)
else
# There was no query, so set the defaults
  num = 4
  char_limit = 30
end


if num.nil? || num == 0
# Check to make sure num is set, otherwise set default
  num = 4
end
if char_limit.nil? || char_limit == 0
# Check to make sure char_limit is set, otherwise set default
  char_limit = 30
end

# Make sure that num is an integer; if not or if 0, then set to default
if num.is_a? String
  num = num.strip.to_i
  if num.is_a? Integer
    if num == 0
      num = 4
    end
  end
end

# Make sure that char_limit is an integer; if not or if 0, then set to default
if char_limit.is_a? String
  char_limit = char_limit.strip.to_i
  if char_limit.is_a? Integer
    if char_limit == 0
      char_limit = 30
    end
  end
end

# We have the wordlist in a file, so open and read into an array
passphrase_wordlist = Array.new

File.open("passphrase_wordlist", "r").each_line do |line|
  passphrase_wordlist.push(line.strip)
end

items = []
num.times do 
    begin loc = rand(passphrase_wordlist.length) end while items.include?(loc)
    items << loc
end

words = items.collect {|loc| passphrase_wordlist[loc]}.join(' ')

size = 0
text = words.split().reject do |token|
  size+=token.size()
  size>char_limit
end.join("")

# Cut off the last word if it's over the char limit
text = text[0...text.rindex(' ')] if text.size > char_limit

printf(text)

What is this? And which words?