Git patch

• Create a patch out of the difference with other branch

git format-patch master --stdout > fix_empty_poster.patch

• Create a patch out of a commit

git show HEAD > some-patch0001.patch

Replace HEAD by a commit number http://ariejan.net/2009/10/26/how-to-create-and-apply-a-patch-with-git

• Appliquer ce patch et autocommiter un commit du changement

git am --signoff < fix_empty_poster.patch

• Revert a patch
  http://drupal.org/patch/reverse

patch -p1 -R < path/file.patch

(If your patch was applied with the -p0 option, use that instead.) Or:

git apply -R path/file.patch