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Whilst M-ping back through history in execute-extended-command, I see many commands are ones which have already appeared earlier (ie more recently).

Is there an option which works similar to (setq eshell-hist-ignoredups 'erase) for the command history?

So whenever a new command is executed, all previous invocations are removed from history.

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Yup: set history-delete-duplicates:

Non-nil means to delete duplicates in history. If set to t when adding a new history element, all previous identical elements are deleted from the history list.

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  • Just what I was looking for, thanks
    – C4ffeine Add1ct
    Commented Aug 23, 2022 at 14:42
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    Note that this deletes dups for all minibuffer histories, not just command-history. That's probably what OP wants, but maybe it's worth mentioning.
    – Drew
    Commented Aug 23, 2022 at 17:03

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