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git branch --merged | grep -v \* | xargs git branch -D
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git branch | grep -v "develop" | grep -v "master" | xargs git branch -D
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git branch | grep -v "develop" | grep -v "master" | xargs git branch -D
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git for-each-ref --format '%(refname:short)' refs/heads | grep -v master | xargs git branch -D