This is overall a good guide, especially emphasizing the 'condition {action}' pattern; it is a very elegant and clear construct. However, some of the suggestio

This is overall a good guide, especially emphasizing the 'condition {action}' pattern; it is a very elegant and clear construct. However, some of the suggestions lean on the "too clever" and can make the code incomprehensible for the newcomer. For instance, if you will use snippets like `awk '!a[$0]++'`, do make sure to comment their use for your sake and others'.