Creates a tag with a common format for an old branch, gives instructions to delete.

archive_branch.sh

#!/bin/bash

git tag -a archive/$1 $1 -m "Archive of branch $1."

echo "Branch: `git rev-parse $1`"
echo "Tag: `git rev-list -n 1 archive/$1`"

echo "Run: git push origin --delete $1"
echo "     git branch -d $1"