[git] How can I check out a GitHub pull request with git?

I prefer to fetch and checkout without creating a local branch and to be in HEAD detached state. It allows me quickly to check the pull request without polluting my local machine with unnecessary local branches.

git fetch upstream pull/ID/head && git checkout FETCH_HEAD

where ID is a pull request ID and upstream where is original pull request has been created (it could be origin, for example).

I hope it helps.

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