On Mon, 24 Dec 2012 12:28:45 +0700, Nguyen Thai Ngoc Duy <pclo...@gmail.com> 
wrote:
> On Mon, Dec 24, 2012 at 11:09 AM, Seth Robertson <in-gitv...@baka.org> wrote:
> >
> > In message <20121224035825.GA17203@zuhnb712>, Woody Wu writes:
> >
> >     How can I find out what's the staring reference point (a commit number
> >     or tag name) of a locally created branch? I can use gitk to find out it
> >     but this method is slow, I think there might be a command line to do it
> >     quickly.
> >
> > The answer is more complex than you probably suspected.
> >
> > Technically, `git log --oneline mybranch | tail -n 1` will tell you
> > the starting point of any branch.  But...I'm sure that isn't what you
> > want to know.
> >
> > You want to know "what commit was I at when I typed `git branch
> > mybranch`"?  The problem is git doesn't record this information and
> > doesn't have the slightest clue.
> 
> Maybe we should store this information. reflog is a perfect place for
> this, I think. If this information is reliably available, git rebase
> can be told to "rebase my whole branch" instead of my choosing the
> base commit for it.

What's the starting point of the branch if I type: git branch foo <commit-ish>?
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