Using git, how do you reset the working tree to the state of the index?

Question

Situation:

1. Edit files
2. Add files to the index
3. Edit more files

Now we have three different states. The state of HEAD, the state

Answer 1

You can use git-checkout-index. Be aware that you need to add

• -f to force it to overwrite existing files, or
• -f -a to enforce overwriting all paths in the index.