1 example for qemu
# launch a live session from an ISO file called "LIVE.iso" and allocate 512 mb to the virtual machine
qemu -m 512 LIVE.iso
qemu-kvm -m 512 LIVE.iso
qemu-system-i386 -m 512 LIVE.iso
# launch a live session from an ISO file called "LIVE.iso" and allocate 512 mb to the virtual machine
qemu -m 512 LIVE.iso
qemu-kvm -m 512 LIVE.iso
qemu-system-i386 -m 512 LIVE.iso