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From: Steve Perry <stp@ekioh.com>
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Subject: Re: editing previous command in the *shell* buffer
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cplum987@gmail.com writes:
> How can I do one or both of the following:
>
> ...
>
> (2) type the first part of the command, and have M-p search for the
> previous occurrence of the command that starts with the same pattern
> I've typed in. This is an xemacs feature I sorely miss.  C-s just
> isn't the same. If often finds all sorts of other cruft you have to
> skip over.
> thanks,

I bind M-p and M-n to comint-previous-matching-input-from-input and
comint-next-matching-input-from-input respectively which I think does
what you want...