Git log --stat summary of branch

use git diff

git diff --stat <branch root> HEAD

for a feature branch you want to use

git diff --stat dev..feature

this relies on not doing back merges. See my post here: http://dymitruk.com/blog/2012/02/05/branch-per-feature/

--stat can take parameters. This is useful if you have a wider terminal. You can do --stat=200 to say that your display can accommodate 200 columns.

If you want to use this in a script, use --numstat instead. It will not truncate paths.