yum updateinfo list security installed | grep 2019 | wc -l

yum update –downloadonly

tar -xvf filename.ova
This creates the following corrolating files:
parrot-security-4.6_virtual-disk001.mf
parrot-security-4.6_virtual-disk001.ovf
parrot-security-4.6_virtual-disk001.vmdk

start cdrom image
qemu-system-x86_64 -m 2048 -cdrom kali-linux-2018.3a-amd64.iso

If no other Hypervisors are running in the background you can add the -enable-kvm option to access the computers virtualization harware.
qemu-system-x86_64 -enable-kvm -m 4096 -cdrom OI-hipster-gui-20180427.iso

Start an image file
qemu-system-x86_64 -m 4096 -hda parrot-security-4.6_virtual-disk001.vmdk

diff -qr /path1/dir1/ /path2/dir2/