rename-git-tag.sh

git tag NEW OLD
git tag -d OLD
git push origin :refs/tags/OLD
git push origin refs/tags/NEW

# Other contributors should clear out the deleted tags from their
# clones or they may re-introduce them to origin by accident.
git pull --prune --tags

# One-liner to rename all tags when migrating from Dist::Zilla to
# Minilla.  Works for the case where your existing tags are in "v0.01"
# format and Minilla wants to start doing "0.01".
git tag | perl -ne 'chomp; if ($_ =~ m{^v(\d+\.\d+)$}) { system($_) for ("git tag $1 v$1","git tag -d v$1","git push origin :refs/tags/v$1","git push origin refs/tags/$1") }'