What does the code illustration visible on StackOverflow's 404 page do? [closed]

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If you hit any non-existent page on SO, like https://stackoverflow.com/not-found, you'll see a small code snippet on the right side of the page (as an illustration)

What exactly does this piece of code do? (I'm asking simply out of curiosity)

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This might get closed as a duplicate on meta too, since it's been answered here. The suggestion for it is here.