Prepare .patch files. Useful when emailing commits elsewhere. See also git am, which can apply generated .patch files.

# To create an auto-named .patch file for all the unpushed commits:
git format-patch <origin>

# To write a .patch file for all the commits between 2 revisions to stdout:
git format-patch <revision_1>..<revision_2>

# To write a .patch file for the 3 latest commits:
git format-patch -<3>