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At a bash prompt, hitting tab twice will come up with a prompt such as Display all 1770 possibilities? (y or n). What paging utility is bash using? It doesn't appear to be less or more. Is it something internal to bash?

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Yes, this is internal to bash, and controlled by the page-completions shell option. I don't think you can configure it other than turning it on and off. (Well, you can set print-completions-horizontally.)

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