Creating and applying Patch

• Create Patch

diff -urN orignalsource updatedsource > file.patch
The above command will create a patch by going recursively through the source and destination.
The option 'N' tells to treat the new files as empty files in the other directory

• Apply Patch

patch --dry-run -p1 < ../file.patch
The above command will run through the patch without applying it and giving information which will be given when the patch would actually will be applied.

patch -p1 < ../file.patch
This would actually apply the patch