If I understand the official documentation at http://git-scm.com/docs/git-diff correctly, -b should be a superset of --ignore-space-at-eol and -w in turn is a superset of -b. In that case, the command git diff --ignore-space-at-eol -b -w [commit] ... would be equivalent to simply git diff -w [commit] .... And I agree with @alecb that -w is a bad idea. Also untested, but I do understand the documentation such that it would regard "test123" and "test 123" as equivalent.
The options do not make sense to me:
If I understand the official documentation at http://git-scm.com/docs/git-diff correctly, -b should be a superset of --ignore-space-at-eol and -w in turn is a superset of -b. In that case, the command
git diff --ignore-space-at-eol -b -w [commit] ...would be equivalent to simplygit diff -w [commit] .... And I agree with @alecb that -w is a bad idea. Also untested, but I do understand the documentation such that it would regard "test123" and "test 123" as equivalent.