From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Andrew <nick@nick-andrew.net>
Subject: Re: Is rebase always destructive?
Date: Mon, 1 Dec 2008 23:11:40 +1100
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To: Csaba Henk <csaba-ml@creo.hu>
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On Mon, Dec 01, 2008 at 11:41:39AM +0000, Csaba Henk wrote:
> When doing a rebase, I can find a number of reasons for which one might
> feel like to preserve the rebased branch (that is, perform an operation
> which copies the branch over a new base, not moves).

[...]

> I can't see any option for rebase which would yield this cp-like
> behaviour. Am I missing something?

How about this:

git checkout topic
git branch keepme
git rebase master

Your 'topic' branch will now be rebased against master, and due
to the 'keepme' branch pointer at the original topic HEAD, you can
see the original commits before rebasing.

Nick.