piyo.rb

require 'net/http'
require 'uri'
require 'optparse'
require "csv"
 
params = ARGV.getopts("k:", "u:")
uri = URI.parse params["u"]
 
document = Net::HTTP.start(uri.host, uri.port) do |http|
  response = http.get("/")
  response.body
end
 
res = [].tap do |res|
  res << ["keyword", "count"]
  params["k"].split(",").each do |keyword|
    res << [keyword, document.force_encoding("utf-8").scan(/#{keyword}/).size]
  end
end
 
path = %(#{uri.host}.csv)
CSV.open(path, "w") do |csv|
  res.each{|row| csv << row }
end

ruby piyo.rb -u url -k keywordで実行する。