$ git diff -C --stat HEAD c9af3e6136e8aec1f79368c2a6164e56bf7a7e07
 app/controllers/application_controller.rb |   34 +++-------------------------
 1 files changed, 4 insertions(+), 30 deletions(-)

git diff --numstat

MOD_PATTERN='^.+([-|{+).*$'
ADD_PATTERN='^{+.*+}$'
REM_PATTERN='^[-.*-]$'
git diff --word-diff --unified=0 | sed -nr
    -e "s/$MOD_PATTERN/modified/p"
    -e "s/$ADD_PATTERN/added/p"
    -e "s/$REM_PATTERN/removed/p"
    | sort | uniq -c

git show commit-id --stat

git diff commit-id-before commit-id --stat

git diff commit-id1 commit-id2 --stat

git log --stat