Diff

Assume Original source code at folder Tb01, and latest source code at folder Tb02. And there have multiple sub directories at Tb01 and Tb02 too.

diff -crB Tb01 Tb02 > Tb02.patch

1. -c context
2. -r recursive (multiple levels dir)
3. -B is to ignore Blank Lines.
4. -u schow diff more readable. (didn't use this for creating a .patch file)

I put -B because blank lines is really useless for patching, sometimes I need to manually read the patch file to track the changes, without -B is really headache.