git delete all local branches not in remote code example
Example 1: delete local branches not on remote
git branch -vv | grep ': gone]'| grep -v "\*" | awk '{ print $1; }' | xargs -r git branch -D
Example 2: git delete branches that aren't on remote
git fetch --all --prune
Example 3: git delete local branches not on remote
git fetch -p && for branch in $(git branch -vv | grep ': gone]' | awk '{print $1}'); do git branch -D $branch; done
Example 4: Remove All Local Branches not on Remote
$ git branch -r | egrep -v -f /dev/fd/0 <(git branch -vv | grep origin) | xargs git branch -d