--pretty="format:%H"

    --abbrev-commit
    --oneline
    --graph

    --date-order
    --author-date-order
    --topo-order              # "smart" ordering
    --reverse

git log -- app/file.rb          # only file
    --simplify-by-decoration    # tags and branches

    --merges
    --no-merges

    --first-parent          # no stuff from merged branches

    --branches="feature/*"
    --tags="v*"
    --remotes="origin"

    --grep="Merge pull request"   # in commit messages
    -S"console.log"               # in code
    -G"foo.*"                     # in code (regex)

    --invert-grep
    --all-match                   # AND in multi --grep

-n, --max-count=2
    --skip=2

    --since="1 week ago"
    --until="yesterday"

    --author="Rico"
    --committer="Rico"

git log master             # branch
git log origin/master      # branch, remote
git log v1.0.0             # tag

git log master develop

git log v2.0..master       # reachable from *master* but not *v2.0*
git log v2.0...master      # reachable from *master* and *v2.0*, but not both