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One of the best introductions to Emacs that I've seen. Good description of basic concepts. Good to reread the fundamentals every now and then and I picked up a couple
Talks about possible attack for piping a script from curl to bash (what your browser user agent sees when viewing the file is not necessary what curl's user agent sees)
Quick reference for Postgres common access commands, etc.
Walks through a refactoring in FactoryGirl using the Null Object pattern to simplify logic.
Introduces Null Object pattern and talks about how you can use it to take advantage of duck typing for better OO design. Not really a great example of how powerful

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