Function that renames a shell alias. Doesn't handle quotes properly

realias.sh

realias() {
	if [ $# -ne 2 ]; then
		echo "Usage: realias old_alias new_alias"
		return 1
	fi

	local o
	o="$(alias -- "$1")" || {
		printf %s "$o"
		return 1
	}

	unalias -- "$1"
	alias -- "$2"="$(printf %s "$o" | sed -E "s/^alias $1=['\"](.*)['\"]$/\1/")"
}