git

http://cheat.errtheblog.com/s/git

git show-branch brach1 (or HEAD to represent current branch) branch2

[Note]

git log --oneline --decorate HEAD..XXXX
git log --oneline --decorate HEAD..android-5.0.2_r1
git log --oneline --decorate android-5.1.0_r1..android-5.0.2_r1