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    There’s nothing here that isn’t explained pretty clearly in the manual.

    Also, command substitution in word for the various expansions is not limited to :? expansion. The article may give that impression.

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      Plenty of really useful articles only present things that are “in the manual”.

      But it may well be that they present those things in a way that some people find more useful, and thus it is perfectly fine to write and share such articles!