Rename git tags

rt.sh

#!/bin/bash

if [ $# -ne 2 ];
then
  echo "usage: $0 <old> <new>";
  exit 1
fi

old=$1
new=$2

git tag | grep "$old" > /dev/null 2>&1
status=$?
if [ $status -ne 0 ];
then
  echo "error: cannot rename non existant tag $old"
  echo "- valid tags are: "
  echo "`git tag | awk '{ print \"    \" $1 }' 2> /dev/null`"
  echo
  exit 2
else
  git tag $new $old
  git tag -d $old
  git push origin :refs/tags/$old
  git push --tags
fi