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This version looks nice and short, any thoughts on prober error reporting to the end user?

My version has more feedback for the user which was important because the user was somebody not familiar with linux/bash, but even my version "swallows" errors.

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I added the `set pipefile...` suggested below, but I think mogrify only fails if the screenshot fails. Tesseract never fails if there is a valid input image, so realistically you only need one error message for the screenshot generation, unless you want to check whether the user misses any of the tools.

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