This is a shorthand for "--pretty=oneline --abbrev-commit"
used together.
---encoding[=<encoding>]::
+--encoding=<encoding>::
The commit objects record the encoding used for the log message
in their encoding header; this option can be used to tell the
command to re-code the commit log message in the encoding
--[no-]standard-notes::
These options are deprecated. Use the above --notes/--no-notes
options instead.
+
+--show-signature::
+ Check the validity of a signed commit object by passing the signature
+ to `gpg --verify` and show the output.