If I run \'git status\' on my repo it gives:
# On branch master # Changes to be committed: # (use \"git reset HEAD ...\" to unstage) # # modified
Your file is already staged to be committed. You can show it's diff using the --cached option of git.
--cached
git diff --cached myfile
To unstage it, just do what git status suggests in it's output ;)
You can check The Git Index For more info.