Checking the difference between a file modified locally and the repository with git

[done this before, never made a note of it]

git see difference between current and repository file

git diff

It's really that easy.

Additions in your local working copy are represented by + signs, subtractions by your local working copy are each preceded by a - sign.

http://media.pragprog.com/titles/tsgit/chap-005-extract.html