$ grep -l "#octopress" ~/blog/*

total 5

1. 2014-03-08 Escaping Liquid Template Tags in Octopress #octopress #ruby
2. 2014-03-08 Displaying Related Posts in Octopress #octopress
3. 2014-03-01 Adding MathJax to Octopress #octopress
4. 2014-02-18 Adding Google AdSense to Octopress #octopress
5. 2014-02-08 Migrating from WordPress to Octopress on Amazon S3 #aws #octopress #wordpress