git-clean-stale-branches

#!/bin/sh
#
# Suggested name for this script: git-clean-stale-branches
#
# This script will help to remove "stale" branches from a remote
# repository (by default the "origin" repository). Stale branches
# are any branches that does not exist in the local repository.
#
# This script should be run in the local repository. It will print
# out a git command to remove all branches from the remote repository
# that do not exist locally. If the command seems to be correct,
# you can copy and paste the command and run it, or re-run the script
# like this:
#
#       git-clean-stale-branches | sh
#
IFS='
'

# Name of remote repository. Can be edited.
remote=origin

printf "git push $remote"
for i in `git branch -r | grep "^ *$remote/" | grep -v HEAD | sed "s;^ *$remote/;;"`
do
	if git rev-parse -q --verify $i >/dev/null
	then
	   nothing=
	else
	   printf " :%s" "$i"
	fi
done
printf "\n"

Thanks for this! To prevent problems where you have locally tracked remote branches that no longer exist in the remote, I added this at line 22 right before you start in the for loop:

git fetch $remote --prune