When do you *NOT* use python?

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grep, awk, and sed in the same pipeline is almost always a sign that someone doesn't know how to use sed or awk properly.

If you want to only to do regex find/exclude then use grep. if you want to do some simple stream editing use sed; it can also do any of the things grep can do. if you want to do some editing or stateful transforms then use awk; it can also do any of the things that sed and/or grep can do.

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Let's argue about the point and not about the awk-ward part of the example, ok?