The formats of git log

git log --pretty=<format> # or --format=<format>

Selection of formats: oneline, fuller, reference, raw. medium is default. More at git docs.

• oneline (aka --oneline): formats as <hash> <title-line>
• fuller: contains hash, author, authordate, commiter, commitdate, commit title, and message
• reference: formats as <abbrev-hash> (<title-line>, <short-author-date>)
• raw: shows commit info as stored in the commit object
• %H: see list of custom placeholders

Also:

• valid for git show, git diff, etc.
• --name-only lists modified files
• -s (e.g. for git show) suppresses file diffs