On 17.01.2013 10:37, lei yang wrote:
> Hi experts
>
> I want to write a script to determine one domain named "vm1" is
> defined or not, if defined, I will undefine it.
>
> The question is how could I know it define or not ?

either you can 'virsh list --persistent --all | grep $vm' or you can try
'virsh undefine $vm' which will throw an error if there's no such domain
as $vm.