How to replace current branch's head with specific commit in git?

If I simply do "checkout some_commit" it will switch me to this commit. But what I need is to sta开发者_StackOverflowy on the current branch (master to be specific) and totally replace all files in it with files from some_commit. How can I do that?

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git reset --hard <commit>

(I'm sure this is a duplicate, but don't have time to search.)