add-prefix-to-tag.sh

#!/bin/bash

if [ -z "$1" ]
then
  echo "enter prefix: "
  read prefix
else
  prefix="$1"
fi

if [ -z "$2" ]
then
  echo "enter tag: "
  read tag
else
  tag="$2"
fi

old=$tag
new=$prefix$tag

echo "old tag: " $old
echo "new tag: " $new

read -r -p "Are you sure? [y/N] " response
if [[ $response =~ ^([yY][eE][sS]|[yY])$ ]]
then
  echo "Renaming tag"
  git tag $new $old
  git tag -d $old
  git push origin :refs/tags/$old
  git push --tags
else
  echo "Exiting..."
fi

#Based on: https://gist.github.com/jloveland/22b641ace8e64df189b8