read the message from the standard input.
--author=<author>::
- Override the author name used in the commit. You can use the
- standard `A U Thor <author@example.com>` format. Otherwise,
- an existing commit that matches the given string and its author
- name is used.
+ Override the commit author. Specify an explicit author using the
+ standard `A U Thor <author@example.com>` format. Otherwise <author>
+ is assumed to be a pattern and is used to search for an existing
+ commit by that author (i.e. rev-list --all -i --author=<author>);
+ the commit author is then copied from the first such commit found.
--date=<date>::
Override the author date used in the commit.