Patch Drupal between versions

gistfile1.sh

#
# Get the last 2 versions and unpack
#
wget DRUPAL-new && tar zxvf DRUPAL-new
wget DRUPAL-old && tar zxvf DRUPAL-old

#
# Create a diff patch
#
diff DRUPAL-old DRUPAL-new > drupal-XtoY.patch

#
# Get to the Drupal root
# Make a dry-run to weed out problems
#
cd /path/to/drupal/root
patch -p1 --dry-run < /path/to/drupal-XtoY.patch

#
# Apply the patch
#
patch -p1 --dry-run < /path/to/drupal-XtoY.patch