How to tell git branch name from commit hash?

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I have a bash script which accepts a string of either a branch name or a commit hash.

What is the best way to determine whether the string is a branch name or a commit hash?

#!/bin/bash
commit_or_branch="$1"
if <is_branch $commit_or_branch>
then
    echo "it's a branch"
else
    echo "it's a commit"
fi

asked 22 secs ago

kristi

3,902

How to tell git branch name from commit hash?