error: command 'save' requires option

This error will come when you are trying to save VM using virsh command. When you try to save VM status using Virt-manager we no need to mention any file to save the status. Virt-manager will take care of saving it. But virsh have no mechanism like this. We have to provide a file to save the machine status.

virsh save domaname filename

Example
virsh save linux1 /opt/linux1.stat