SHELL

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

delete local branches not on remote

git branch -vv | grep ': gone]'|  grep -v "*" | awk '{ print $1; }' | xargs -r git branch -D

git delete branches not on remote

git branch --merged >/tmp/merged-branches && 
  vi /tmp/merged-branches && xargs git branch -d </tmp/merged-branches