git check-ref-format

Checks if a given refname is acceptable, and exits with a non-zero status if it is not. More information: https://git-scm.com/docs/git-check-ref-format.

Check the format of the specified refname:
git check-ref-format {{refs/head/refname}}
Print the name of the last branch checked out:
git check-ref-format --branch @{-1}
Normalize a refname:
git check-ref-format --normalize {{refs/head/refname}}

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