Bash function to add to your .bash_profile or .zshrc that collects git branches to be deleted via standard in

gitcleanup.sh

gitcleanup() {
  echo 'Paste git branches to be deleted below then press enter...\n'
  while read line
  do
    if [ -n "$line" ]; then
      echo "\n"
      git branch -D $line
      echo "\n"
    fi
  done < "${1:-/dev/stdin}"
}