What is the legality of selling a commercial business, comprised of its customers, goodwill, trade name, right to lease, equipment, and goods, according to Tunisian law?

If by "trade name" what is meant is a name that has gained renown, then there is no objection to selling it and receiving compensation for it, as it holds a material value that is recognized by Islamic law. As for "khalaw" (premium for vacating a property), it is permissible to receive compensation for it as long as the the lease is valid. However, if the lease expires without renewal, then it is not permissible to demand it. And as for tools and merchandise, there is no objection to selling them and seeking compensation for them.