Category Archives: Things I’ve Learned

Ansible: Running Commands in Dry-Run Mode in Check Mode

Say you have an¬†Ansible¬†playbook that invokes a command. Normally, that command executes when you run ansible normally, and doesn’t execute at all when you run ansible in check mode. But a lot of commands, like rsync have a -n or … Continue reading

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City Mileage

I’ve known forever that city mileage for cars is worse than highway mileage, but I never knew why. But it’s a bit like riding a bike. When you ride a bike, you have to put in a lot of work … Continue reading

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Grand Juries: Some Suggestions on Note-Taking

In which I share some things I only figured out after over a month of grand-jurying. If your grand jury is anything like mine, each session you have a pad of paper with your name on it, that you get … Continue reading

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Programming Tip: Open and Close at the Same Time

One useful programming habit I picked up at some point is: if you open or start something, immediately close it or end it. If you open a bracket, immediately write its closing bracket. If you open a file, immediately write … Continue reading

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Overfitting

One of the things I learned in math is that a polynomial of degree N can pass through N+1 arbitrary points. A straight line goes through any two points, a parabola goes through any three points, and so forth. The … Continue reading

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Removing Missing Podcast Episodes from iTunes

So I figured something out today. I add and remove podcasts in iTunes all the time. And every so often, iTunes loses track of, er, tracks. This usually shows up in a smart playlist, where a podcast episode exists in … Continue reading

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Da da da

Today is National Grammar Day, but rather than rail against common misuses of the English language like the insufferable language snob that I am, I thought I’d mention a peculiarity of language that I happened to notice. The German word … Continue reading

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