git log @{u}..
# @{u} is a shortcut to the upstream branch that this current branch is tracking.
# .. specifies a range of commits.
# same as saying git log @{u}..HEAD
# comparing where HEAD is on this branch to where HEAD is on the remote tracked branch.s
# https://stackoverflow.com/questions/19474577/what-does-the-argument-u-mean-in-git/19474730#19474730