If -o is specified, output files are created in <dir>. Otherwise
they are created in the current working directory.
-If -n is specified, instead of "[PATCH] Subject", the first line
-is formatted as "[PATCH n/m] Subject".
+By default, the subject of a single patch is "[PATCH] First Line" and
+the subject when multiple patches are output is "[PATCH n/m] First
+Line". To force 1/1 to be added for a single patch, use -n. To omit
+patch numbers from the subject, use -N
If given --thread, 'git-format-patch' will generate In-Reply-To and
References headers to make the second and subsequent patch mails appear
-n::
--numbered::
- Name output in '[PATCH n/m]' format.
+ Name output in '[PATCH n/m]' format, even with a single patch.
-N::
--no-numbered::