How do I update vm hostname, UUID from ESXI host or via ssh?

I am using ESXi 6.7  and 6.5 versions. How can I change the hostname and UUID (instanceUUID ) of the vms on my ESXi host. When I run the command hostname in one of the linux vms , it returns a valid value. However, the hostname is not set in the guest info.
I have checked usinf MOB and vim-cmd vmsvc/get.guest <vmid> | grep hostName command

How do I set and edit these values.