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Blocking the internet underbelly from your server

People selling unmentionables on the internet resort to spam. One example is the use of comments on Blog articles by robots to advertise pornography and disreputable medications. I have created several blogs, and if I enable comments without administrator approval, within several hours to a day the blog will be covered with thousands of comments advertising things you just don't want on your site.

Using the Pipe Operator - String replace in multiple files

The unix command line is a wonderful thing. It allows us to string many commands together by use of a pipe. For example, if I want to find all python files, I could type

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