qm-destroy
Destroy a virtual machine in QEMU/KVM Virtual Machine Manager.
TLDR
Destroy a specific virtual machine
$ qm destroy [vm_id]
Destroy all disks that are not explicitly referenced in a specific virtual machine's configuration
$ qm destroy [vm_id] --destroy-unreferenced-disks
Destroy a virtual machine and remove from all locations (inventory, backup jobs, high availability managers, etc.)
$ qm destroy [vm_id] --purge
Destroy a specific virtual machine ignoring locks and forcing destroy
$ sudo qm destroy [vm_id] --skiplock