Summarizes the git log output.
# To view a summary of all the commits made, grouped alphabetically by author name:
git shortlog
# To view a summary of all the commits made, sorted by the number of commits made:
git shortlog -n
# To view a summary of all the commits made, grouped by the commiter identities (name and email):
git shortlog -c
# To view a summary of the last 5 commits (i.e. specify a revision range):
git shortlog HEAD~<5>..HEAD
# To view all users, emails and the number of commits in the current branch:
git shortlog -sne
# To view all users, emails and the number of commits in all branches:
git shortlog -sne --all