shellquote()
{
	local i o s

	s=""
	for i in "$@"; do
		o=$(echo "$i" | LC_COLLATE=C sed -e 's/[^[:alnum:]]/\\&/g')
		echo -n "$s$o"
		s=" "
	done
}

treen()
{
	tmux new-window "$(shellquote "$@")"
}

treen "eins zwei" zwei drei