Git, Prune Remote Branches that have been merged into origin/master

PruneRemoteBranches.sh

# Needs to executed in git bash, powershell with posh-git won't work.
# NB, change grep -v master to be the branch you want to check, e.g. grep -v development
# Preview
git fetch -p origin && git branch -r --merged | grep origin | grep -v '>' | grep -v master | xargs -L1 |  cut -d"/" -f2- | xargs -d ' '

# Actual
git fetch -p origin && git branch -r --merged | grep origin | grep -v '>' | grep -v master | xargs -L1 | cut -d"/" -f2- | xargs git push origin --delete