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You don't really need '-C HEAD' at all. The default behavior is to just reuse the last commit message, which is, implicitly, HEAD.

That doesn't work for me. git commit -a --amend prompts for commit message in $editor git commit -a --amend -C complains about lack of input

Maybe this is a git version specific thing.

Is there a way to do that in hg?

git commit --amend -aCHEAD