-p | --patch
Add individual changes of a file
$ git add -p README.md-a | --all
Add all changes for tracked files
$ git commit -a--amend
Update your previous commit with chance to edit the message
$ git commit --amend--staged
compare the files in the index
$ git diff --staged filename.php-uno | --untracked-files=no
Prevent the display of untracked files
$ git status -uno