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From:   Junio C Hamano <gitster@pobox.com>
To:     Alexander Mills <alexander.d.mills@gmail.com>
Cc:     "Randall S. Becker" <rsbecker@nexbridge.com>, git@vger.kernel.org
Subject: Re: check if one branch contains another branch
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Date:   Thu, 07 May 2020 16:41:56 -0700
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        (Alexander Mills's message of "Thu, 7 May 2020 16:37:34 -0700")
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Alexander Mills <alexander.d.mills@gmail.com> writes:

> I assume that:
>
> git branch -d  xxx
>
> will prevent a delete if the current branch doesn't contain xxx..
> I don't want to have to checkout  origin/dev in order to run that command,
> that's one part of the problem

In that case, don't you want to learn, not just if your 'dev' has
anything that is not merged/accepted by origin/dev, what commits
in 'dev' are not yet merged in origin/dev?

 $ git log origin/dev..dev

would show them.