From: Hong-Ming Su <halleyinvent@gmail.com>
Date: Tue, 01 Nov 2011 07:27:43 GMT
Subject: how to undo a merge
Message-ID: <CANiMyiEoaxAO3XxJMWEXP-L7C_xkxU0_nyDaor+TsJr-Ch7ARw@mail.gmail.com>

The commit graph before merging is:
A--B <-master
 \  \
  \  \
C--D--E--F <- dev

git checkout master
git merge dev

The commit graph after merging is:
A--B
 \  \
  \  \
C--D--E--F <- dev <-master

master fast-forward to commit F.
I want to "undo" the merge. What shall I do?

Thank you!

Best regards,
Hong-Ming