# Delete all tags remotely
git tag -l | xargs -n 1 git push --delete origin
# Delete all tags locally
git tag | xargs git tag -d
# Delete all merged branches
git fetch --prune; git branch -r --merged | grep origin | grep -v '>' | grep -v master | xargs -L1 | awk '{sub(/origin\//,"");print}' | xargs git push origin --delete