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rails-3 cron job不使用rails runner

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最近我遇到了以下运行cron作业而不使用任何Gems的教程
http://www.ameravant.com/posts/recurring-tasks-in-ruby-on-rails-using-runner-and-cron-jobs

我在/app/delete_old_posts.rb中创建了一个文件

class DeleteOldPosts < ActiveRecord::Base          
    # This script deletes all posts that are over 5 minutes old          
     post_ids = Post.find(:all, :conditions => ["created_at < ?", 5.minutes.ago])          
     if post_ids.size > 0     
      Post.destroy(post_ids)     
      puts "#{post_ids.size} posts have been deleted!"       
     end

然后通过给crontab -e命令创建cron作业,并在我编写的cronjob控制台中创建

*/2 * * * * /usr/bin/env ruby /home/abc/xyz/urjit.rajgor/workspace/thewall/rails/runner/home/XYZ/ABC/urjit.rajgor/workspace/thewall/app/delete_old_posts.rb

cron工作每两分钟运行一次但是没有用
请帮我 .
谢谢

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