Interactively Unstage Changes

I often use git add --patch to interactively stage changes for a commit. Git takes me through changes to tracked files piece by piece to check if I want to stage them. This same interactive staging of files can be used in reverse when removing changes from the index. Just add the --patch flag.

You can use it for a single file

$ git reset --patch README.md

or you can let it operate on the entire repository

$ git reset --patch

This is useful when you've staged part of a file for a commit and then realize that some of those changes shouldn't be committed.