Git Interactive Rebase The First Commit

Everytime I want to do an interactive rebase I pass the number of commits back that I want using head~number:

> git rebase -i head~3

Recently I created a repo that had only 2 commits and I got an error when I tried to do a rebase the same way:

> git rebase -i head~2
fatal: Needed a single revision
invalid upstream 'head~2'

To avoid that error, you can use a --root option to rebase the first commit:

> git rebase -i --root

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