How to list files in specific revision in `git`?

I want to know file list开发者_如何转开发 in specific revision in git repository. How can I do this?

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git ls-tree -r --name-only $REV

for example

git ls-tree -r --name-only a27689bf7f46dc0735c5b3b6076010c87224063e

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See dannyp's answer.

 git ls-tree -r --name-only $REV