emits the new commit object id on stdout. The log message is read
from the standard input, unless `-m` or `-F` options are given.
+The `-m` and `-F` options can be given any number of times, in any
+order. The commit log message will be composed in the order in which
+the options are given.
+
A commit object may have any number of parents. With exactly one
parent, it is an ordinary commit. Having more than one parent makes
the commit a merge between several lines of history. Initial (root)
OPTIONS
-------
<tree>::
- An existing tree object
+ An existing tree object.
-p <parent>::
Each `-p` indicates the id of a parent commit object.
-F <file>::
Read the commit log message from the given file. Use `-` to read
- from the standard input.
+ from the standard input. This can be given more than once and the
+ content of each file becomes its own paragraph.
-S[<keyid>]::
--gpg-sign[=<keyid>]::