How do I undo 'git add' before commit?

Answer 1

As per many of the other answers, you can use git reset

BUT:

I found this great little post that actually adds the Git command (well, an alias) for git unadd: see git unadd for details or..

Simply,

git config --global alias.unadd "reset HEAD"

Now you can

git unadd foo.txt bar.txt