When you want to do a git diff but do not care about the full diff and just want to know which files changed, use the --name-only switch:

$ git diff --name-only
app/controllers/sessions_controller.rb
app/models/user.rb
features/sign_in.feature

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To include some brief information about changed lines, use the --stat switch:

$ git diff --stat
app/controllers/sessions_controller.rb |    8 +-
app/models/user.rb                     |   30 ++++
features/sign_in.feature               |  136 +++++++++++++++++

The output of --stat is nicely colored. If you want a more machine-readable output, use the --numstat switch:

$ git diff --numstat
4       4       app/controllers/sessions_controller.rb
18      12      app/models/user.rb
123     13      features/sign_in.feature