delete merged branches

gistfile1.txt

# define the branches to ignore
ignoredBranches="master\|staging\|production\|HEAD"

# run from master
git checkout master

# update list of remotes
git fetch
git remote prune origin

# remove local fully merged branches
git branch --merged master | 
grep -v ${ignoredBranches} | 
xargs git branch -d

# show remote fully merged branches
echo "The following remote branches are fully merged and will be removed:"
git branch -r --merged master | 
sed 's/ *origin\///' | 
grep -v ${ignoredBranches}

read -p "Continue (y/n)? "
if [ "$REPLY" == "y" ]
then
  # remove remote fully merged branches
  git branch -r --merged master | 
  sed 's/ *origin\///' | 
  grep -v ${ignoredBranches} | 
  xargs -i% git push origin :heads/%

  echo "Done!"
fi

The -i option passed to xargs (line 29) needs to be lowercase in Git Bash on Windows (uppercase I throws error), but needs to be uppercase in Bash on OS X (lowercase i throws error).